CN103812579A

CN103812579A - Received Signal Strength Indicator Circuit with Low Voltage and Wide Detection Energy Range

Info

Publication number: CN103812579A
Application number: CN201210444001.6A
Authority: CN
Inventors: 周忠昀; 杨朝栋
Original assignee: KEYSTONE SEMICONDUCTOR CORP
Current assignee: KEYSTONE SEMICONDUCTOR CORP
Priority date: 2012-11-08
Filing date: 2012-11-08
Publication date: 2014-05-21

Abstract

The invention discloses a Received Signal Strength Indicator (RSSI) circuit with low voltage and wide detectable energy range, comprising: a plurality of amplifiers connected in series, a plurality of rectifiers, and a selector. The input end of each of the plurality of rectifiers is connected to the output end of one of the plurality of amplifiers in sequence, and the selector is connected to the respective output end of the plurality of rectifiers to select one output from the plurality of outputs of the plurality of rectifiers. By using the selector to select an output from the plurality of outputs of the plurality of rectifiers, the RSSI circuit of the present invention can detect a wide energy range with the same voltage since each stage can use the entire voltage range.

Description

There is the received signal strength indicator device circuit of low-voltage and wide detected energy scope

Technical field

The present invention relates to a kind of received signal strength indicator device (received si gnal strength indicator, RSSI) circuit, especially a kind of have low-voltage and a wide received signal strength indicator device circuit that can detected energy scope.

Background technology

Received signal strength indicator device is a kind of for measuring the existing energy of received RF signal, for example, and the measurement technology of signal strength signal intensity.Common design is acquisition radio frequency or intermediate-freuqncy signal, and produces the voltage or the electric current output that are equal to signal strength signal intensity.The ability that receiver captures weak signal is called as receiver sensitivity, and the ability that the higher receiver of receiver sensitivity captures weak signal is better.Signal strength signal intensity can measure based on output voltage.In telecommunications is propagated, consider design difficulty or ease, RSSI after amplifying, carries out in intermediate frequency (intermediate frequency, the IF) stage conventionally.The output of RSSI normally one can pass through the DC simulation level that internal simulation-digital quantizer (analog-digital converter, ADC) samples.For the device of radio frequency receiver that disposes RSSI, such as mobile phone, Wi-Fi adapter, remote controller etc., the user of device normally cannot see RSSI's.

In general, RSSI circuit is to realize with multistage (multi-stage) amplifier and rectifier.Fig. 1 has shown a kind of schematic diagram of existing RSSI circuit.RSSI circuit is five amplifiers with Pyatyi structural arrangement, and etc. the rectifier of quantity carry out.As shown in Figure 1, amplifier 101 is to arrange with the form of tandem, and the output of amplifier 101 is connected to the input of each other rectifier 102.And the output of rectifier 102 is obtained the final output of RSSI circuit by summation.

Fig. 2 shows that a chart presents the final output of RSSI circuit in Fig. 1.This chart is presented on tested measuring point, the relation of RSSI output voltage and energy intensity.Be the scope that RSSI output voltage can be grown up therein along the represented headroom of output voltage axle.As shown in Figure 2, because be finally output as the summation of outputs at different levels, in Fig. 1, the result of the Pyatyi practising way of RSSI is that each section represents the output of each grade corresponding to the lines of five series connection sections.In Fig. 2, the slope of lines can be interpreted as the sensitivity of RSSI, or the ability of difference input signal energy intensity.In other words the interval mapping that, represents energy range is in voltage spaces.Because the scope of whole input voltage by mapping in whole admissible voltage range, for example, headroom shown in Fig. 2, thus a fixing input voltage interval only can mapping in a relatively little voltage spaces, and may cause because of the interference of noise erroneous judgement.In other words, common detectable energy range is limited.In order to increase detectable energy range, voltage that must be high to be so that sufficient voltage top scope to be provided for the operation of RSSI, and operation under low suppling voltage can be restricted.

Summary of the invention

The object of the invention is to make the shortcoming that overcomes above-mentioned prior art RSSI circuit.Main purpose of the present invention is to provide a kind of RSSI circuit, and what this RSSI circuit had an extension can detected energy scope, and does not need voltage to promote.

Another object of the present invention is to provide a kind of higher sensitivity that has, and the RSSI circuit of the output voltage that can amplify take difference as little detected energy interval.

In order to reach above-mentioned object, the invention provides a kind of have low-voltage and wide received signal strength indicator device circuit that can detected energy scope, comprise: multiple amplifiers, connect in serial connection mode; Multiple rectifiers, the input of each of the plurality of rectifier is sequentially connected to respectively in the plurality of amplifier the output of one of them; And a selector, be connected in the plurality of rectifier each output, in order to select an output from multiple outputs of the plurality of rectifier.

Narration more than the present invention and other object, feature, outward appearance and advantage, can be by reading carefully in following provided specific descriptions, and suitably with reference to graphic explanation, and can more clearly understand.

Accompanying drawing explanation

Appended graphic further understanding and the combination and the some that forms this specification wherein providing about the embodiment of the present invention, illustrates embodiments of the invention and the explanation together providing for the principle of the embodiment of the present invention is provided.

In graphic:

Fig. 1 has shown a kind of schematic diagram of existing RSSI circuit;

Fig. 2 shows that a chart presents the final output of RSSI circuit in Fig. 1;

Fig. 3 shows the schematic diagram of the RSSI circuit of the embodiment of the present invention; And

Fig. 4 shows that a chart presents the output of RSSI circuit in Fig. 3.

Wherein, description of reference numerals is as follows:

101 amplifiers

102 rectifiers

301 amplifiers

302 rectifiers

303 selectors

Embodiment

Fig. 3 shows the schematic diagram of the RSSI circuit of the embodiment of the present invention.As shown in Figure 3, RSSI circuit of the present invention comprises multiple amplifiers that connect in serial connection mode 301, multiple rectifier 302, and a selector 303.In the plurality of rectifier 302, the input of each is sequentially connected to respectively in the plurality of amplifier 301 output of one of them, and this selector 303 is connected in the plurality of rectifier 302 output of each, to select an output from multiple outputs of the plurality of rectifier 302.In this embodiment, five amplifiers 301 and five rectifiers 302 have been comprised to implement the RSSI circuit of Pyatyi.And also can use different number of stages.

Fig. 4 shows that a chart presents the output of RSSI circuit in Fig. 3.For example, because selector 303, in order to select an output from all output of the plurality of rectifier 302,, in the present embodiment, is selected from five outputs; Input energy range is shown as five parallel sections with respect to the map of output voltage range, and each reflection section is corresponding to one-level, for example output of a rectifier 302.

Compare with respect to the map of output voltage range with the input energy range shown in Fig. 2, in Fig. 4 a fixing input voltage interval by mapping in larger voltage spaces.In other words, RSSI circuit of the present invention provides higher discrimination for a fixing energy bite, and compared with traditional RSSI circuit of Fig. 1, whole RSSI circuit can detect wider input energy range.

It should be noted that the present invention also allows selectable mapping section.Each energy bite can be considered as by critical value on one and operation window that once critical value limits.Can select a suitable mapping section for the target input energy in this operation window.As indicated in Fig. 4, for a target critical value T, selector can be set and select mapping section 2 with to the relation that mirrors input energy and output voltage.

As described above is only in order to explain the preferred embodiment of this creation; not attempt tool this creation is done to any pro forma restriction; there is work under identical creation spirit about any modification or the change of this creation, all must be included in the category of this creation intention protection therefore all.

Claims

1. there is low-voltage and a wide received signal strength indicator device circuit that can detected energy scope, comprise:

Multiple amplifiers, connect in serial connection mode;

Multiple rectifiers, the input of each in the plurality of rectifier is sequentially connected to respectively in the plurality of amplifier the output of one of them; And

One selector, is connected in the plurality of rectifier each output, in order to select an output from multiple outputs of the plurality of rectifier.

2. as claimed in claim 1 have low-voltage and a wide received signal strength indicator device circuit that can detected energy scope, and wherein this selector can detect input energy according to a target and select this output.