CN200956564Y - Amplifier - Google Patents
Amplifier Download PDFInfo
- Publication number
- CN200956564Y CN200956564Y CN 200620045361 CN200620045361U CN200956564Y CN 200956564 Y CN200956564 Y CN 200956564Y CN 200620045361 CN200620045361 CN 200620045361 CN 200620045361 U CN200620045361 U CN 200620045361U CN 200956564 Y CN200956564 Y CN 200956564Y
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- CN
- China
- Prior art keywords
- resistance
- amplifier
- transistor
- voltage
- stabilizing circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 10
- 239000003381 stabilizer Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model discloses an amplifier, comprising a voltage stabilizing circuit, a transistor and an amplifier tube. The utility model is applied on an integrated circuit, crystal amplifier circuit and any other circuit to substitute the amplifier which needs larger voltage gain.
Description
Technical field
The utility model relates to the bigger amplifier of a kind of voltage gain.
Background technology
We know that constant-current source is exactly the power supply that can export constant current.If the internal resistance of power supply E is r, R1 is a load resistance, according to Ohm's law: if flow through the electric current of RL is that I=E/r+R1 r is very big as 500K, this moment, RL was when 1K---10K changes so, I will be constant substantially (having only small variation) because R1 too insignificant with respect to r, this moment we can think that E is a constant-current source.We reason out for this reason: constant-current source is a very large power supply of the internal resistance of source. from then on use the bigger amplifier of voltage gain that arrives in our electronic circuit of principle always, common method designs the load resistance of transistor collector big as far as possible, but this resistance too senior general makes transistor enter saturation condition easily, causes the circuit instability.
Summary of the invention
The utility model is the amplifier that will provide a kind of voltage gain bigger, utilizes transistor to replace this big resistance, so both can obtain big resistance, and direct current pressure drop simultaneously is also little, has avoided transistor to enter saturation condition.
In order to achieve the above object, the technical scheme that the utility model adopted is: the amplifier that a kind of voltage gain is bigger, by voltage stabilizing circuit, transistor Q1, amplifier tube Q2 forms, the voltage stabilizing circuit that voltage-stabiliser tube D and resistance R 2 are composed in series, transistor Q1 base stage is connected on the series connection point of voltage stabilizing circuit, transistor Q1 emitter is connected on positive source E+ by resistance R 1, transistor Q1 collector electrode is connected to amplifier tube Q2 collector electrode, amplifier tube Q2 grounded emitter, amplifier tube Q2 base stage is connected on resistance R 3, resistance R 4 series connection intermediate points, resistance R 3 another points meet positive source E+, resistance R 4 other end ground connection.
The voltage stabilizing circuit that voltage-stabiliser tube D and resistance R 2 formed is used for the working point of Q1 of setovering, and guarantees the stable of working point, and Q2 is an amplifier tube.From transistorized output characteristic as can be known, collector electrode---emitter voltage VEC is during greater than 1---2V, and characteristic curve almost is flat, when promptly VEC changes, and I
CSubstantially constant, that is to say that the output resistance of transistor Q1 is very big, can reach more than the hundreds of kilo-ohm, because the electric current substantially constant of Q1, so claim that Q1 is the Constant Current Load of Q2.Because it is big because of its load resistance to have the amplifier of current source loads, so this amplifying circuit has great voltage gain,
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described
As shown in Figure 1, the voltage stabilizing circuit that voltage-stabiliser tube D and resistance R 2 are composed in series, transistor Q1 base stage is connected on the series connection point of voltage stabilizing circuit, transistor Q1 emitter is connected on positive source E+ by resistance R 1, transistor Q1 collector electrode is connected to amplifier tube Q2 collector electrode, amplifier tube Q2 grounded emitter, and amplifier tube Q2 base stage is connected on resistance R 3, resistance R 4 series connection intermediate points, resistance R 3 another points meet positive source E+, resistance R 4 other end ground connection.
Claims (1)
1. amplifier, by voltage stabilizing circuit, transistor (Q1), amplifier tube (Q2) is formed, it is characterized in that, voltage-stabiliser tube (D) and resistance (R2) are composed in series voltage stabilizing circuit, transistor (Q1) base stage is connected on the series connection point of voltage stabilizing circuit, transistor (Q1) emitter is connected on positive source (E+) by resistance (R1), transistor (Q1) collector electrode is connected to amplifier tube (Q2) collector electrode, amplifier tube (Q2) grounded emitter, amplifier tube (Q2) base stage is connected on resistance (R3), resistance (R4) series connection intermediate point, another point of resistance (R3) connects positive source (E+), and resistance (R4) other end ground connection is used for voltage gain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620045361 CN200956564Y (en) | 2006-08-31 | 2006-08-31 | Amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620045361 CN200956564Y (en) | 2006-08-31 | 2006-08-31 | Amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200956564Y true CN200956564Y (en) | 2007-10-03 |
Family
ID=38775146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620045361 Expired - Fee Related CN200956564Y (en) | 2006-08-31 | 2006-08-31 | Amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200956564Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108648693A (en) * | 2018-07-26 | 2018-10-12 | 武汉精测电子集团股份有限公司 | A kind of drive module for OLED high drives |
-
2006
- 2006-08-31 CN CN 200620045361 patent/CN200956564Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108648693A (en) * | 2018-07-26 | 2018-10-12 | 武汉精测电子集团股份有限公司 | A kind of drive module for OLED high drives |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |