CN106909194A

CN106909194A - It is a kind of with high-order temperature compensated bandgap voltage reference

Info

Publication number: CN106909194A
Application number: CN201710159750.7A
Authority: CN
Inventors: 李斌; 陈兆权; 黄沫; 刘洋; 吴朝晖; 严耀锋
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2017-03-17
Filing date: 2017-03-17
Publication date: 2017-06-30
Anticipated expiration: 2037-03-17
Also published as: CN106909194B

Abstract

The invention discloses a bandgap reference voltage source with high-order temperature compensation, which includes a three-output switched capacitor converter, a switched capacitor module one and a switched capacitor module two, and the input voltage V _CC is connected to the input of the three-output switched capacitor converter terminal, the output terminals of the three-output switched capacitor converter respectively output three bias voltages V _EB1 , V _EB2 and V _EB3 , the first bias voltage V _EB1 is connected to the first input terminal of the switched capacitor module one, and the second bias voltage The setting voltage V _EB2 is connected to the second input terminal of the switched capacitor module one and the second input terminal of the switched capacitor module two, the third bias voltage V _EB3 is connected to the third input terminal of the switched capacitor module two, and the switched capacitor module one The output terminal of the switch capacitor module 2 is connected to the first input terminal of the switched capacitor module 2, and the output terminal of the switched capacitor module 2 outputs the reference voltage V _REF . Based on the switched capacitor structure, the invention greatly reduces the complexity of the circuit, realizes high-order temperature compensation that eliminates high-order items and band gap references, and obtains a lower temperature coefficient.

Description

Band-gap reference voltage source with high-order temperature compensation

Technical Field

The invention relates to the field of analog integrated circuits and band-gap reference design, in particular to a band-gap reference voltage source with high-order temperature compensation.

Background

The band-gap reference voltage source is a basic unit module in an integrated circuit, and is widely applied to various analog integrated circuit chips, such as LNA, Mixer, ADC, high-precision comparator, voltage stabilizer, DC/DC converter and the like, and digital-analog hybrid integrated circuit chips, such as D-LDO, VCO, PLL and the like.

The traditional bandgap reference voltage source comprises bipolar transistors T1, T2 and T3, an error amplifier A1, integrated MOS transistors MP1, MP2 and MP3, resistors R1 and R2, a temperature-dependent voltage term is obtained by mirroring MP1 branch current and enabling the branch current to flow through the resistor R2 and then to be connected with T3 in series, and finally an output voltage VREF which is basically independent of temperature is obtained.

Although the traditional band-gap reference voltage source can well eliminate a primary term related to temperature through linear combination, the temperature characteristic of the traditional band-gap reference voltage source is still not ideal due to the fact that a bipolar transistor base-emitter voltage expression has a high-order term, and particularly for a low-voltage output reference source, the temperature coefficient of the traditional band-gap reference voltage source can reach hundreds of ppm; in addition, because the traditional band-gap reference voltage source structure needs to adopt an operational amplifier and more resistors, the circuit complexity is higher, the power supply voltage is higher and the layout area is larger.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a band-gap reference voltage source with high-order temperature compensation based on a switched capacitor structure, and the temperature coefficient of the band-gap reference voltage source is reduced by adopting a high-order compensation method while the circuit complexity is reduced.

The purpose of the invention can be realized by the following technical scheme:

a band-gap reference voltage source with high-order temperature compensation comprises a three-output switch capacitor converter, a switch capacitor module I and a switch capacitor module II, wherein an input voltage V_CCConnected to the input end of the three-output switch capacitor converter, and the output ends of the three-output switch capacitor converter respectively output three bias voltages V_EB1、V_EB2And V_EB3First path bias voltage V_EB1A first input end connected to the first switch capacitor module, a second path of bias voltage V_EB2A third bias voltage V connected to the second input terminal of the first switched capacitor module and the second input terminal of the second switched capacitor module_EB3The third input end of the second switched capacitor module is connected, the output end of the first switched capacitor module is connected to the first input end of the second switched capacitor module, and the output end of the second switched capacitor module outputs a reference voltage V_REF。

Furthermore, the three-output switch capacitor converter comprises a three-output capacitor boosting module, a first clamping circuit module, a second clamping circuit module and a third clamping circuit module, and the input voltage V is_CCIs connected to the three outputsThe input end of the capacitor boosting module and the first output end of the three-output capacitor boosting module output V_CC1And is connected to the input end of the first clamping circuit module, and the output end of the first clamping circuit module outputs a voltage V_EB1(ii) a The second output end of the three-output capacitor boosting module outputs V_CC2And is connected to the input end of the second clamping circuit module, and the output end of the second clamping circuit module outputs a voltage V_EB2(ii) a The third output end of the three-output capacitor boosting module outputs V_CC3And is connected to the input end of the third clamping circuit module, and the output end of the third clamping circuit module outputs a voltage V_EB3。

Further, the three-output capacitor boosting module comprises eight switches S₁₃₁、S₁₃₂、S₁₃₃、S₁₃₄、S₂₃₁、S₂₃₂、S₂₃₃、S₂₃₄And three capacitors C_C1、C_C2、C_C3Wherein an input voltage V_CCIs connected to the switch S₁₃₁、S₁₃₂、S₁₃₄And S₂₃₃First connection terminal of, switch S₁₃₁Is connected to said capacitor C_C2And said switch S₂₃₁The first connection terminal of, the capacitor C_C2Is connected to the switch S₂₃₃Second connection terminal of, said switch S₂₃₁The second connecting end is used as the first output end of the three-output capacitor boosting module and outputs V_CC1(ii) a The switch S₁₃₂A second connection is connected to the switch S₂₃₂First connection terminal and said capacitor C_C1The first connection terminal of, the capacitor C_C1Is connected to the switch S₂₃₃Second connection terminal of, said switch S₂₃₃Is connected to said capacitor C_C3And said switch S₁₃₃The first connection end of the switch S₂₃₂The second connecting end is used as a third output end of the three-output capacitor boosting module and outputs V_CC3(ii) a The switch S₁₃₃The second connection terminal of the capacitor C is grounded, and the capacitor C is connected to the ground_C3Is connected to the switch S₁₃₄Second connection terminal of and the switch S₂₃₄The first connection end of the switch S₂₃₄The second connecting end is used as the second output end of the three-output capacitor boosting module and outputs V_CC2。

Further, the first clamping circuit module comprises a capacitor C₃₁And a first bipolar transistor Q₁Said capacitor C₃₁Is connected to the first bipolar transistor Q₁The capacitor C, the capacitor C₃₁The second connection of the first bipolar transistor Q is grounded, and the first bipolar transistor Q is connected to the ground₁The base and the collector of (2) are grounded, and the first bipolar transistor Q₁The emitting electrode of the first clamping circuit module serves as the output end of the first clamping circuit module and outputs a voltage V_EB1。

Further, the second clamping circuit module comprises a capacitor C₃₂And a second bipolar transistor Q₂Said capacitor C₃₂Is connected to the second bipolar transistor Q₂The capacitor C, the capacitor C₃₂Is connected to ground, said second bipolar transistor Q₂The base and the collector of (2) are grounded, and the second bipolar transistor Q₂The emitting electrode of the second clamping circuit module is used as the output end of the second clamping circuit module and outputs a voltage V_EB2。

Further, the third clamping circuit module comprises a resistor R which is positively correlated with the temperature_TCapacitor C₃₃And a third bipolar transistor Q₃The resistance R is positively correlated with the temperature_TIs connected to said third bipolar transistor Q₃Emitter and capacitor C₃₃First connection terminal of, capacitor C₃₃The second connection terminal of the third bipolar transistor Q is grounded₃The base and the collector of (2) are grounded, and a third bipolar transistor Q₃The emitting electrode of the third clamping circuit module is used as the output end of the third clamping circuit module and outputs voltage V_EB3。

Further, the first switched capacitor module comprises a switch S₁₄And b identical switchesA capacitor unit b is any positive integer, wherein the first output end of the three-output switch capacitor converter outputs V_EB1And is connected to the first input of the switched-capacitor unit and to the switch S₁₄Second connection terminal of, said switch S₁₄Is connected to the second input terminal of the switched capacitor unit; the second output end of the three-output switch capacitor converter outputs V_EB2And connected to a third input terminal of the switched-capacitor unit; the b switched capacitor units are sequentially cascaded, the output end of the b-th switched capacitor unit is used as the output end of the first switched capacitor module, and voltage b delta V is output_EB12+V_EB1；

Further, the second switched capacitor module comprises c same switched capacitor units, and c has the same meaning as b, wherein the first output end of the three-output switched capacitor converter outputs V_EB1And the output end of the first switched capacitor module is connected to the second input end of the switched capacitor unit, and the third output end of the three-output switched capacitor converter outputs V_EB3And the output end of the c-th switched capacitor unit is used as the output end of the second switched capacitor module and outputs reference voltage V_REF。

Further, the switched capacitor unit includes: three switches S₂₄₁、S₂₄₂、S₁₄And a capacitor C₄₁Wherein a first input terminal of the switched-capacitor unit is connected to the switch S₂₄₁And as a first output terminal of the switched capacitor unit, the switch S₂₄₁The first connecting end of the capacitor C is connected with₄₁And said switch S₁₄The first connection end of the switch S₁₄As a second output terminal of the switched-capacitor unit, the second input terminal of the switched-capacitor unit being connected to the capacitor C₄₁Second connection terminal of and the switchS₂₄₂A third input terminal of the switched capacitor unit is connected to the switch S₂₄₂And as a third output terminal of the switched capacitor unit.

Further, the switch S₁₃₁、S₁₃₂、S₁₃₃、S₁₃₄、S₁₄Must be turned off simultaneously or turned on simultaneously; the switch S₂₃₁、S₂₃₂、S₂₃₃、S₂₃₄、S₂₄₁、S₂₄₂And the switch state of (S)₁₃₁、S₁₃₂、S₁₃₃、S₁₃₄、S₁₄The switch states of (2) are opposite.

Furthermore, the output ends of the first switched capacitor module and the second switched capacitor module need to be additionally connected with a capacitor in parallel, and the output voltage b Δ V of the first switched capacitor module and the output voltage b Δ V of the second switched capacitor module are respectively equal to the output voltage b Δ V of the first switched capacitor module and the output voltage b Δ V of the second switched capacitor module_EB12+V_EB1And V_REFAnd performing voltage stabilization filtering processing.

Compared with the prior art, the invention has the following advantages and beneficial effects:

compared with the prior art, the band-gap reference voltage source does not need a high-precision current mirror, a starting circuit and a high power supply rejection ratio operational amplifier in the traditional band-gap reference voltage source, not only greatly reduces the circuit complexity based on a switched capacitor structure, but also realizes linear combination through the switched capacitor to eliminate high-order terms, realizes high-order temperature compensation of the band-gap reference, and thus obtains a lower temperature coefficient.

Drawings

Fig. 1 is a schematic structural diagram of a conventional bandgap reference voltage source.

FIG. 2 is a system block diagram of a bandgap reference voltage source with high-order temperature compensation according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a three-output switch capacitor converter according to an embodiment of the invention.

Fig. 4 is a schematic diagram of a first switched capacitor module according to an embodiment of the invention.

Fig. 5 is a schematic diagram of a second switched capacitor module according to an embodiment of the invention.

FIG. 6 shows the output voltages V of the first, second and third clamping circuit modules_EB1、V_EB2And V_EB3Temperature profile.

FIG. 7 is a schematic diagram illustrating a temperature curve compensation effect according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.

Example (b):

the structure of a conventional bandgap reference voltage source is shown in fig. 1, and this embodiment provides a bandgap reference voltage source with high-order temperature compensation based on the improvement of the conventional bandgap reference voltage source, as shown in fig. 2, including a three-output switched capacitor converter, a switched capacitor module i and a switched capacitor module ii, where an input voltage V is input into the three-output switched capacitor converter_CCConnected to the input end of the three-output switch capacitor converter, and the output ends of the three-output switch capacitor converter respectively output three bias voltages V_EB1、V_EB2And V_EB3First path bias voltage V_EB1A first input end connected to the first switch capacitor module, a second path of bias voltage V_EB2A third bias voltage V connected to the second input terminal of the first switched capacitor module and the second input terminal of the second switched capacitor module_EB3The output end of the first switched capacitor module is connected to the first input end of the second switched capacitor moduleThe input end of the switch capacitor module II outputs a reference voltage V_REF。

The three-output switch capacitor converter is used for boosting a single input voltage and enabling the bipolar transistor Q₁、Q₂、Q₃And the LED is operated in a diode mode, and then three-way output is carried out. And the first switch capacitor module is used for carrying out linear combination on input signals and outputting reference voltage for eliminating a first-order term of temperature. And the second switch capacitor module is used for carrying out linear combination on the input signals and outputting the reference voltage for eliminating the high-order term of the temperature.

Further, the schematic diagram of the three-output switched capacitor converter is shown in fig. 3, and includes a three-output capacitor boost module, a first clamp circuit module, a second clamp circuit module, and a third clamp circuit module, where the input voltage V is_CCThe first output end of the three-output capacitor boosting module outputs V_CC1And is connected to the input end of the first clamping circuit module, and the output end of the first clamping circuit module outputs a voltage V_EB1(ii) a The second output end of the three-output capacitor boosting module outputs V_CC2And is connected to the input end of the second clamping circuit module, and the output end of the second clamping circuit module outputs a voltage V_EB2(ii) a The third output end of the three-output capacitor boosting module outputs V_CC3And is connected to the input end of the third clamping circuit module, and the output end of the third clamping circuit module outputs a voltage V_EB3。

Wherein the three-output capacitor boosting module comprises eight switches S₁₃₁、S₁₃₂、S₁₃₃、S₁₃₄、S₂₃₁、S₂₃₂、S₂₃₃、S₂₃₄And three capacitors C_C1、C_C2、C_C3Wherein an input voltage V_CCIs connected to the switch S₁₃₁、S₁₃₂、S₁₃₄And S₂₃₃First connection terminal of, switch S₁₃₁Is connected to said capacitor C_C2First ofConnection terminal and switch S₂₃₁The first connection terminal of, the capacitor C_C2Is connected to the switch S₂₃₃Second connection terminal of, said switch S₂₃₁The second connecting end is used as the first output end of the three-output capacitor boosting module and outputs V_CC1(ii) a The switch S₁₃₂A second connection is connected to the switch S₂₃₂First connection terminal and said capacitor C_C1The first connection terminal of, the capacitor C_C1Is connected to the switch S₂₃₃Second connection terminal of, said switch S₂₃₃Is connected to said capacitor C_C3And said switch S₁₃₃The first connection end of the switch S₂₃₂The second connecting end is used as a third output end of the three-output capacitor boosting module and outputs V_CC3(ii) a The switch S₁₃₃The second connection terminal of the capacitor C is grounded, and the capacitor C is connected to the ground_C3Is connected to the switch S₁₃₄Second connection terminal of and the switch S₂₃₄The first connection end of the switch S₂₃₄The second connecting end is used as the second output end of the three-output capacitor boosting module and outputs V_CC2。

The switch S₁₃₁、S₁₃₂、S₁₃₃、S₁₃₄At the same time, the input voltage V is closed_CCFor the capacitor C_C1、C_C2、C_C3Charging is carried out, the capacitor C_C1、C_C2、C_C3The first connection end is charged to V_CC(ii) a The switch S₁₃₁、S₁₃₂、S₁₃₃、S₁₃₄When turned off at the same time, the switch S₂₃₁、S₂₃₂、S₂₃₃、S₂₃₄When closed simultaneously, the capacitor C_C1、C_C2、C_C3The first connection terminal potential is clamped at V_CCAbove, then the capacitor C_C1、C_C2、C_C3Will be instantaneously charged to 2V_CCAnd the three-way output of the three-output capacitor boosting module is used.

Wherein,the first clamping circuit module comprises a capacitor C₃₁And a first bipolar transistor Q₁Said capacitor C₃₁Is connected to the first bipolar transistor Q₁The capacitor C, the capacitor C₃₁The second connection of the first bipolar transistor Q is grounded, and the first bipolar transistor Q is connected to the ground₁The base and the collector of (2) are grounded, and the first bipolar transistor Q₁The emitting electrode of the first clamping circuit module serves as the output end of the first clamping circuit module and outputs a voltage V_EB1. The second clamping circuit module comprises a capacitor C₃₂And a second bipolar transistor Q₂Said capacitor C₃₂Is connected to the second bipolar transistor Q₂The capacitor C, the capacitor C₃₂Is connected to ground, said second bipolar transistor Q₂The base and the collector of (2) are grounded, and the second bipolar transistor Q₂The emitting electrode of the second clamping circuit module is used as the output end of the second clamping circuit module and outputs a voltage V_EB2. Wherein the capacitance C₃₁For filtering the input voltage ripple of the first clamping circuit module and keeping the bipolar transistor Q₁Is clamped at V_EB1The above step (1); the capacitor C₃₂The second clamping circuit module is used for filtering the input voltage ripple of the second clamping circuit module and keeping the bipolar transistor Q₂Is clamped at V_EB2The above.

Input currents of the first and second clamp circuit blocks, i.e. the bipolar transistor Q₁、Q₂Independent of temperature, the emitter current of (2) can be:

wherein V_g0Representing the value of the diode voltage at a temperature of 0K, C, D representing a temperature independent constant, T representing the thermodynamic temperature, η representing a process dependent, temperature independent constant, V_TIndicating a thermal voltage.

The clamping circuit module IIIComprising a resistance R which is positively correlated with temperature_TCapacitor C₃₃And a third bipolar transistor Q₃The resistance R is positively correlated with the temperature_TIs connected to said third bipolar transistor Q₃Emitter and capacitor C₃₃First connection terminal of, capacitor C₃₃The second connection terminal of the third bipolar transistor Q is grounded₃The base and the collector of (2) are grounded, and a third bipolar transistor Q₃The emitting electrode of the third clamping circuit module is used as the output end of the third clamping circuit module and outputs voltage V_EB3. The capacitor C₃₃The third clamping circuit module is used for filtering the input voltage ripple of the third clamping circuit module and keeping the bipolar transistor Q₃Is clamped at V_EB3The above. The resistance R in positive correlation with temperature_TIs acting as a bipolar transistor Q₃The emitter provides an input current that is positively correlated with temperature, so that:

wherein V_g0Represents the value of the diode voltage at a temperature of 0K; C. d₁Representing a constant independent of temperature, T representing a thermodynamic temperature, η representing a constant independent of temperature, related to the process, V_TIndicating a thermal voltage.

Further, a schematic diagram of the first switched capacitor module is shown in fig. 4, and includes a switch S₁₄And b identical switched capacitor units, b being an arbitrary integer, wherein the first output end of the three-output switched capacitor converter outputs V_EB1And is connected to the first input of the switched-capacitor unit and to the switch S₁₄Second connection terminal of, said switch S₁₄Is connected to the second input terminal of the switched capacitor unit; the second output end of the three-output switch capacitor converter outputs V_EB2And connected to a third input terminal of the switched-capacitor unit; the b switched capacitor units are cascaded in sequence, and the b th switched capacitor unitThe output end of the switch capacitor module I is used as the output end of the switch capacitor module I, and the voltage b delta V is output_EB12+V_EB1. The schematic diagram of the second switched capacitor module is shown in fig. 5, and includes c same switched capacitor units, where the first output end of the three-output switched capacitor converter outputs V_EB1And the output end of the first switched capacitor module is connected to the second input end of the switched capacitor unit, and the third output end of the three-output switched capacitor converter outputs V_EB3And the output end of the c-th switched capacitor unit is used as the output end of the second switched capacitor module and outputs reference voltage V_REF。

Further, the switched capacitor unit includes: three switches S₂₄₁、S₂₄₂、S₁₄And a capacitor C₄₁Wherein a first input terminal of the switched-capacitor unit is connected to the switch S₂₄₁And as a first output terminal of the switched capacitor unit, the switch S₂₄₁The first connecting end of the capacitor C is connected with₄₁And said switch S₁₄The first connection end of the switch S₁₄As a second output terminal of the switched-capacitor unit, the second input terminal of the switched-capacitor unit being connected to the capacitor C₄₁Second connection terminal of and the switch S₂₄₂A third input terminal of the switched capacitor unit is connected to the switch S₂₄₂And as a third output terminal of the switched capacitor unit.

Further, the output voltage V of the first clamping circuit module, the second clamping circuit module and the third clamping circuit module_EB1、V_EB2、V_EB3Is shown in FIG. 6, V_EB1、V_EB2、V_EB3Is inversely related to temperature, and V_EB1Slope greater than V_EB3Slope greater than V_EB2The slope.

In the first switched capacitor module, the switch S of the switched capacitor unit₂₄₁、S₂₄₂When closed, the capacitor C₄₁The voltage across will be charged to V_EB1-V_EB2：

ΔV_BE＝V_EB1-V_EB2

From the diode current-voltage characteristic:

ΔV_BE＝V_Tln(n)

n is a first bipolar transistor Q₁And a second bipolar transistor Q₂The number ratio of (1) is usually 8, in which case, Δ V_BEIs a first order term for the thermodynamic temperature T.

Switch S of the switched capacitor unit₁₄When the switch capacitor module I is closed, the input voltage of the second input end of the switch capacitor module I is clamped at V_EB1At this time, b of the capacitors C₄₁The output voltage of the first switched capacitor module is b delta V because the voltage at two ends of the capacitor can not change suddenly_EB12+V_EB1。

Where k is boltzmann constant, C, D denotes a constant independent of temperature, T is thermodynamic temperature, and q denotes the magnitude of the charge amount:

in the second switched capacitor module, the switch S of the switched capacitor unit₂₄₁、S₂₄₂When closed, the capacitor C₄₁The voltage across will be charged to V_EB1-V_EB3Namely:

the capacitor C₄₁Voltage V across_EB1-V_EB3Is a high order term for temperature.

Switch S of the switched capacitor unit₁₄When the switch capacitor module is closed, the input voltage of the second input end of the switch capacitor module II is clamped at b delta V_EB12+V_EB1At this time, C of the capacitors C₄₁The two ends of the capacitor can not be suddenly changed, so that the output voltage of the second switch capacitor module is b delta V_EB12+V_EB1+c(V_EB1-V_EB3) And finally outputting the reference voltage as follows:

the first order and higher order terms of the temperature of the reference voltage can be eliminated by selecting appropriate values of b and c.

c＝η

When in useWhen c is 0, outputting a first-order compensation band gap reference voltage; when in useη, the final effect is shown in fig. 7, Δ V_EB12Is in positive correlation with temperature, V_EB1Is inversely related to temperature, Δ V_EB12And V_EB1And linear combination is carried out according to the value b, so that a first-order temperature compensation effect is achieved, and the curve of the first-order temperature compensation curve is mainly in a parabolic shape. Δ V_EB13Exhibits a high order relation with temperature, and multiplies c times by delta V_EB13And linearly combining with the first-order temperature compensation curve to synthesize a high-order temperature compensation curve, wherein the shape of the high-order temperature compensation curve is mainly wave-shaped.

In conclusion, the band-gap reference voltage source does not contain an operational amplifier, the circuit complexity is greatly reduced based on a switched capacitor structure, a high-order compensation circuit is simple, high-order temperature compensation is realized by eliminating high-order terms through a resistor related to temperature, a lower temperature coefficient is obtained, and the precision of the band-gap reference voltage source is greatly improved.

The above description is only for the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept within the scope of the present invention, which is disclosed by the present invention, and the equivalent or change thereof belongs to the protection scope of the present invention.

Claims

1. A bandgap reference voltage source with high order temperature compensation, comprising: comprises a three-output switch capacitor converter, a first switch capacitor module and a second switch capacitor module, wherein the input voltage V_CCConnected to the input end of the three-output switch capacitor converter, and the output ends of the three-output switch capacitor converter respectively output three bias voltages V_EB1、V_EB2And V_EB3First path bias voltage V_EB1A first input end connected to the first switch capacitor module, a second path of bias voltage V_EB2Is connected to the switched capacitorA second input terminal of the first module, a second input terminal of the second switched capacitor module, and a third bias voltage V_EB3The third input end of the second switched capacitor module is connected, the output end of the first switched capacitor module is connected to the first input end of the second switched capacitor module, and the output end of the second switched capacitor module outputs a reference voltage V_REF。

2. A bandgap reference voltage source with high order temperature compensation according to claim 1, wherein: the three-output switch capacitor converter comprises a three-output capacitor boosting module, a first clamping circuit module, a second clamping circuit module and a third clamping circuit module, and input voltage V_CCThe first output end of the three-output capacitor boosting module outputs V_CC1And is connected to the input end of the first clamping circuit module, and the output end of the first clamping circuit module outputs a voltage V_EB1(ii) a The second output end of the three-output capacitor boosting module outputs V_CC2And is connected to the input end of the second clamping circuit module, and the output end of the second clamping circuit module outputs a voltage V_EB2(ii) a The third output end of the three-output capacitor boosting module outputs V_CC3And is connected to the input end of the third clamping circuit module, and the output end of the third clamping circuit module outputs a voltage V_EB3。

3. A bandgap reference voltage source with high order temperature compensation according to claim 2, wherein: the three-output capacitor boosting module comprises eight switches S₁₃₁、S₁₃₂、S₁₃₃、S₁₃₄、S₂₃₁、S₂₃₂、S₂₃₃、S₂₃₄And three capacitors C_C1、C_C2、C_C3Wherein an input voltage V_CCIs connected to the switch S₁₃₁、S₁₃₂、S₁₃₄And S₂₃₃First connection terminal of, switch S₁₃₁Is connected to said capacitor C_C2First connection end ofAnd said switch S₂₃₁The first connection terminal of, the capacitor C_C2Is connected to the switch S₂₃₃Second connection terminal of, said switch S₂₃₁The second connecting end is used as the first output end of the three-output capacitor boosting module and outputs V_CC1(ii) a The switch S₁₃₂A second connection is connected to the switch S₂₃₂First connection terminal and said capacitor C_C1The first connection terminal of, the capacitor C_C1Is connected to the switch S₂₃₃Second connection terminal of, said switch S₂₃₃Is connected to said capacitor C_C3And said switch S₁₃₃The first connection end of the switch S₂₃₂The second connecting end is used as a third output end of the three-output capacitor boosting module and outputs V_CC3(ii) a The switch S₁₃₃Is connected to ground, said capacitor C_C3Is connected to the switch S₁₃₄Second connection terminal of and the switch S₂₃₄The first connection end of the switch S₂₃₄The second connecting end is used as the second output end of the three-output capacitor boosting module and outputs V_CC2。

4. A bandgap reference voltage source with high order temperature compensation according to claim 2, wherein: the first clamping circuit module comprises a capacitor C₃₁And a first bipolar transistor Q₁Said capacitor C₃₁Is connected to the first bipolar transistor Q₁The capacitor C, the capacitor C₃₁The second connection of the first bipolar transistor Q is grounded, and the first bipolar transistor Q is connected to the ground₁The base and the collector of (2) are grounded, and the first bipolar transistor Q₁The emitting electrode of the first clamping circuit module serves as the output end of the first clamping circuit module and outputs a voltage V_EB1The structure and function of the first clamping circuit module are the same as those of the second clamping circuit module, and the second clamping circuit module comprises a capacitor C₃₂And a second bipolar transistor Q₂Said capacitor C₃₂Is connected to the second bipolar transistor Q₂The capacitor C, the capacitor C₃₂Is connected to ground, said second bipolar transistor Q₂The base and the collector of (2) are grounded, and the second bipolar transistor Q₂The emitting electrode of the second clamping circuit module is used as the output end of the second clamping circuit module and outputs a voltage V_EB2。

5. A bandgap reference voltage source with high order temperature compensation according to claim 2, wherein: the third clamping circuit module comprises a resistor R which is positively correlated with the temperature_TCapacitor C₃₃And a third bipolar transistor Q₃The resistance R is positively correlated with the temperature_TIs connected to said third bipolar transistor Q₃Emitter and capacitor C₃₃First connection terminal of, capacitor C₃₃The second connection terminal of the third bipolar transistor Q is grounded₃The base and the collector of (2) are grounded, and a third bipolar transistor Q₃The emitting electrode of the third clamping circuit module is used as the output end of the third clamping circuit module and outputs voltage V_EB3。

6. A bandgap reference voltage source with high order temperature compensation according to claim 1, wherein: the first switch capacitor module comprises a switch S₁₄And b identical switched capacitor units, b being any positive integer, wherein the first output end of the three-output switched capacitor converter outputs V_EB1And is connected to the first input of the switched-capacitor unit and to the switch S₁₄Second connection terminal of, said switch S₁₄Is connected to the second input terminal of the switched capacitor unit; the second output end of the three-output switch capacitor converter outputs V_EB2And connected to a third input terminal of the switched-capacitor unit; the b switched capacitor units are sequentially cascaded, the output end of the b-th switched capacitor unit is used as the output end of the first switched capacitor module, and voltage b delta V is output_EB12+V_EB1(ii) a The second switched capacitor module comprises c same switched capacitor units, and c has the same meaning as b, wherein the third outputFirst output end output V of switch capacitor converter_EB1And the output end of the first switched capacitor module is connected to the second input end of the switched capacitor unit, and the third output end of the three-output switched capacitor converter outputs V_EB3And the output end of the c-th switched capacitor unit is used as the output end of the second switched capacitor module and outputs reference voltage V_REF。

7. A bandgap reference voltage source with high order temperature compensation according to claim 6, wherein: the switched capacitor unit includes: three switches S₂₄₁、S₂₄₂、S₁₄And a capacitor C₄₁Wherein a first input terminal of the switched-capacitor unit is connected to the switch S₂₄₁And as a first output terminal of the switched capacitor unit, the switch S₂₄₁The first connecting end of the capacitor C is connected with₄₁And said switch S₁₄The first connection end of the switch S₁₄As a second output terminal of the switched-capacitor unit, the second input terminal of the switched-capacitor unit being connected to the capacitor C₄₁Second connection terminal of and the switch S₂₄₂A third input terminal of the switched capacitor unit is connected to the switch S₂₄₂And as a third output terminal of the switched capacitor unit.

8. A bandgap reference voltage source with high order temperature compensation according to claim 3, 6 or 7, wherein: the switch S₁₃₁、S₁₃₂、S₁₃₃、S₁₃₄、S₁₄Must be turned off simultaneously or turned on simultaneously; the switch S₂₃₁、S₂₃₂、S₂₃₃、S₂₃₄、S₂₄₁、S₂₄₂On/off state ofThe switch S₁₃₁、S₁₃₂、S₁₃₃、S₁₃₄、S₁₄The switch states of (2) are opposite.

9. A bandgap reference voltage source with high order temperature compensation according to claim 1, wherein: and the output ends of the first switched capacitor module and the second switched capacitor module are additionally connected with a capacitor in parallel, and the output voltages of the first switched capacitor module and the second switched capacitor module are subjected to voltage stabilization and filtering processing.