CN102571014A - Voltage type automatic gain control circuit - Google Patents
Voltage type automatic gain control circuit Download PDFInfo
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- CN102571014A CN102571014A CN201210030608XA CN201210030608A CN102571014A CN 102571014 A CN102571014 A CN 102571014A CN 201210030608X A CN201210030608X A CN 201210030608XA CN 201210030608 A CN201210030608 A CN 201210030608A CN 102571014 A CN102571014 A CN 102571014A
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Abstract
The invention discloses a voltage type automatic gain control circuit. The voltage type automatic gain control circuit comprises an amplitude sampler used for sampling a controlled signal and a reference voltage signal respectively, voltage followers which are connected with the amplitude sampler and are used for isolating the sampled controlled signal and the reference voltage signal respectively so as to obtain a stable voltage signal, alternating current resistors which are connected with the voltage followers and are used for calculating an average value of the stable controlled signal and the reference voltage signal respectively by utilizing the resistors, and a bias current source, wherein a bias terminal of the bias current source is connected with the alternating current resistors, and an output terminal of the bias current source is taken as an output terminal of the voltage type AGC (automatic gain control) circuit and is used for outputting control current by utilizing the average value of the stable controlled signal and the average value of the reference voltage signal as bias voltage. According to the voltage type AGC (automatic gain control) circuit of the invention, output current can be stabilized in a short time, and proper locking precision is maintained.
Description
Technical field
The present invention relates to communications industry electronic circuit design field, especially a kind of voltage-type automatic gain control circuit (Automatic Gain Control is called for short agc circuit) that is used for E class CMOS power amplifier drive circuit.
Background technology
In the permanent envelope transceiver system of present bluetooth cheaply and other short-distance wireless communications; Because the high efficiency and the simplicity of design of E class CMOS power amplifier are used widely; It needs agc circuit is that it provides stable bias current, can accomplish good switch performance to guarantee input pipe.
The agc circuit that prior art is used for the driving of E class CMOS power amplifier is current mode, and its difference through amplitude of samples voltage and reference voltage converts electric current into comes bias current sources is charged and discharged, so that it is stable.But because voltage transitions needs a resistance during for electric current, the resistance size of this resistance receives the trade-offs of lock speed and locking precision, and when resistance was too big, locking time was very fast, but precision is lower, and is relatively poor to the antijamming capability of voltage disturbance; When resistance too hour, though precision is improved, locking time is longer, is unfavorable for the work of dual-mode.
Summary of the invention
The technical problem that (one) will solve
For solving above-mentioned one or more problems, the present invention proposes a kind of voltage-type agc circuit, reaches stable with the electric current that in the time faster, makes output, and keeps suitable locking precision.
(2) technical scheme
According to an aspect of the present invention, a kind of voltage-type automatic gain control circuit is provided.This voltage-type automatic gain control circuit comprises: amplitude sampler, voltage follower, separated alternating current resistance and bias current sources, and wherein: the amplitude sampler is used for respectively controlled signal and reference voltage signal being sampled; Voltage follower is connected with the amplitude sampler, is used for controlled signal and reference voltage signal after the sampling are isolated respectively, to obtain stable voltage signal; At a distance from the alternating current resistance, be connected with voltage follower, be used for stable controlled signal and reference voltage signal are utilized resistance averaged respectively; Bias current sources, its offset side be connected at a distance from alternating current resistance, its output is as the output of this voltage-type agc circuit, the mean value of mean value and reference voltage signal that is used to utilize controlled signal is exported Control current as bias voltage.
(3) beneficial effect
Can know by technique scheme; In the voltage-type agc circuit of the present invention; The output voltage amplitude of E class CMOS power amplifier drive circuit is stabilized in a stable amplitude, is applicable to the application of low-cost portable bluetooth and other short distance radio communication system transceivers, specifically:
(1), thereby reduced the circuit reaction time owing to employing voltage directly converts bias voltage into and need not become electric current to convert bias voltage again to voltage transitions, shorter relatively locking time thereby voltage-type agc circuit of the present invention is compared with the current mode agc circuit; In addition,, and need not consider the influence of direct current in the current mode agc circuit because the output voltage of E class CMOS power amplifier drive circuit only receives the control of its output voltage amplitude, feed back more direct, higher thereby voltage-type agc circuit of the present invention locks precision;
(2) agc circuit of the present invention is simple in structure, and not need big resistance be voltage with current conversion, thereby its cost is lower, and its function can satisfy the needs of the permanent envelope transceiver system of bluetooth and other short-distance wireless communications cheaply fully.
Description of drawings
Fig. 1 is the structure principle chart of embodiment of the invention voltage-type agc circuit;
Fig. 2 is the structure principle chart of envelope detector in the embodiment of the invention voltage-type agc circuit amplitude sampler;
Fig. 3 is the structure principle chart of reference voltage source in the embodiment of the invention voltage-type agc circuit;
Fig. 4 is the structure principle chart of current source in the embodiment of the invention voltage-type agc circuit;
Fig. 5 is that employing embodiment of the invention voltage-type agc circuit is the output voltage curve chart that E class CMOS power amplifier provides E class CMOS power amplifier when driving.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to further explain of the present invention.Though this paper can provide the demonstration of the parameter that comprises particular value, should be appreciated that parameter need not definitely to equal corresponding value, but in acceptable error margin or design constraint, be similar to corresponding value.
In one exemplary embodiment of the present invention, a kind of voltage-type agc circuit is proposed.Fig. 1 is the structure principle chart of embodiment of the invention voltage-type agc circuit.As shown in Figure 1, the present embodiment agc circuit comprises: amplitude sampler, voltage follower, separated alternating current resistance and bias current sources.Wherein, the amplitude sampler is sampled to controlled signal and reference voltage signal respectively, obtains both amplitude informations; Voltage follower is isolated respectively controlled signal and reference voltage signal after sampling, to obtain stable voltage signal; At a distance from the alternating current resistance above-mentioned two signals are asked for signal averaging, this mean value is applied to the bias voltage place of bias current sources, and bias current sources is charged and discharged, and the output of bias current sources is as the output of this voltage-type agc circuit.Below respectively each part of present embodiment agc circuit is elaborated.
As shown in Figure 1, in the present embodiment, the amplitude sampler comprises envelope detector and reference voltage source.Wherein, the input of envelope detector is connected to controlled signal, and output is connected to the first voltage follower unit; Reference voltage source independently produces another voltage as amplitude reference, and its output is connected to the second voltage follower unit.
Fig. 2 is the structure principle chart of difference channel envelope detector in the embodiment of the invention voltage-type agc circuit amplitude sampler.Certainly, envelope detector can be basic difference form as shown in Figure 2, and the difference channel of detected envelope function can also be arranged for other.As shown in Figure 2; The difference channel envelope detector comprises: the first difference NMOS manages (NMOS1); Second difference NMOS pipe (NMOS2) and first tail current NMOS pipe (NMOS3), wherein the grid end of the first difference NMOS pipe (NMOS1) and second difference NMOS pipe (NMOS2) is respectively as two inputs of difference channel, and its drain terminal is connected to supply voltage VDD; Its source end is connected to the output of difference channel jointly; The grid end of above-mentioned first tail current NMOS pipe (NMOS3) is connected to difference direct current biasing Bias1, and the source end is connected to ground, and drain terminal is connected to the output of difference channel.
Fig. 3 is the structural representation of source follower reference voltage source in the embodiment of the invention voltage-type agc circuit amplitude sampler.Certainly, reference voltage source can be form as shown in Figure 3, can also the circuit that the reference voltage function is provided be arranged for other.This source follower reference voltage source is equivalent to the monolateral circuit of envelope detector.It comprises: the 4th NMOS manages (NMOS4), and its grid end is connected to reference voltage, and its drain terminal is connected to supply voltage VDD; The 5th NMOS manages (NMOS5), and its grid end is connected to bias voltage Bias2, and its drain terminal is connected to the source end of the 4th NMOS pipe (NMOS4), as the output of this source follower reference voltage source, and its source end ground connection.Wherein, The 4th NMOS pipe (NMOS4) of this source follower reference voltage source is measure-alike with the first difference NMOS pipe (NMOS1) of Fig. 2 difference channel envelope detector; The 4th NMOS pipe (NMOS4) of this source follower reference voltage source is that the first tail current source NMOS of Fig. 2 difference channel envelope detector manages the half the of (NMOS3) size; The bias voltage Bias2 of this source follower reference voltage source is consistent with the difference direct current biasing Bias1 of difference channel envelope detector, to guarantee to export direct voltage likewise.
As shown in Figure 1, in the present embodiment, voltage follower comprises the first voltage follower unit and the second voltage follower unit.Wherein, The first voltage follower unit is the standard units gain amplifier; Its first input end is connected to the output of envelope detector, and second input is connected with output, and its function is the bias direct current voltage isolation with the AC signal of envelope detector and bias current sources; The second voltage follower unit also is the standard units gain amplifier, and its input is connected to the output voltage of reference voltage source, and second input is connected with output, and its function is the bias direct current voltage isolation with reference voltage source and bias current sources.
In the present embodiment, comprise first at a distance from the alternating current resistance unit and the second separated alternating current resistance unit, can certainly the circuit that cut off communication function be arranged for other at a distance from the alternating current resistance.First input at a distance from alternating current resistance unit is connected with the first voltage follower unit.Second input at a distance from alternating current resistance unit is connected with the second voltage follower unit.First is connected to bias current sources jointly at a distance from the alternating current resistance unit and second output at a distance from alternating current resistance unit, holds thereby will get the bias voltage Bias that receives current source after voltage behind the envelope is made even all with reference voltage through resistance.Present embodiment through being added to the bias voltage place of current source after making even all, can not receive the influence of locking time and precision with sampled voltage and reference voltage, in the time faster, reaches stable, and the locking precision is higher.
Fig. 4 is the structure principle chart of bias current sources in the embodiment of the invention voltage-type agc circuit.Certainly, bias current sources can be form as shown in Figure 4, can also be other forms of circuit.As shown in Figure 4, this bias current sources comprises: the 6th NMOS manages (NMOS6), and its grid end is connected to the input Bias of current source circuit, and its source end is connected to the drain terminal of the 2nd NMOS pipe, and its drain terminal is connected to supply voltage VDD; The 7th NMOS manages (NMOS7), its grid end and its drain terminal short circuit, and be connected to the output OUT of current source circuit jointly, its source end is connected to ground.
The present invention is to make current source can export bigger electric current with direct current biasing at first in the specific implementation, drives E class CMOS power amplifier; Make the bigger amplitude of its output; Amplitude progressively reduces electric current through behind the envelope detector, finally reaches dynamic equilibrium, exports stable amplitude.Fig. 5 is that to adopt embodiment of the invention voltage-type agc circuit be the output voltage curve chart of E class CMOS power amplifier drive circuit E class CMOS power amplifier drive circuit when current source is provided.As shown in Figure 5; The output signal ratio of the E class CMOS power amplifier drive circuit during beginning is bigger; Be adjuster power; This signal is input to the input of envelope detector, and detected amplitude signal of envelope detector and reference voltage source are through asking average at a distance from the alternating current resistance, with the bias voltage of this average voltage as bias current sources; The output current output of this bias current sources goes to control the voltage output of E class CMOS power amplifier drive circuit, makes the output voltage of E class CMOS power amplifier drive circuit finally be stabilized in a suitable amplitude.
Can know by technique scheme; In the voltage-type agc circuit of the present invention; The output voltage amplitude of E class CMOS power amplifier drive circuit is stabilized in a stable amplitude, is applicable to the application of low-cost portable bluetooth and other short distance radio communication system transceivers, specifically:
(1), thereby reduced the circuit reaction time owing to employing voltage directly converts bias voltage into and need not become electric current to convert bias voltage again to voltage transitions, shorter relatively locking time thereby voltage-type agc circuit of the present invention is compared with the current mode agc circuit; Because the output voltage of E class CMOS power amplifier drive circuit only receives the control of its output voltage amplitude, and need not consider the influence of direct current in the current mode agc circuit, feed back more direct, higher thereby voltage-type agc circuit of the present invention locks precision;
(2) agc circuit of the present invention is simple in structure, and not need big resistance be voltage with current conversion, thereby its cost is lower, and its function can satisfy the needs of the permanent envelope transceiver system of bluetooth and other short-distance wireless communications cheaply fully.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. voltage-type automatic gain control circuit comprises: amplitude sampler, voltage follower, at a distance from alternating current resistance and bias current sources, wherein:
Said amplitude sampler is used for respectively controlled signal and reference voltage signal being sampled;
Said voltage follower is connected with said amplitude sampler, is used for controlled signal and reference voltage signal after the sampling are isolated respectively, to obtain stable voltage signal;
Said separated alternating current resistance is connected with said voltage follower, is used for stable controlled signal and reference voltage signal are utilized resistance averaged respectively;
Said bias current sources, its offset side is connected at a distance from alternating current resistance with said, and its output is as the output of this voltage-type agc circuit, and the mean value of mean value and reference voltage signal that is used to utilize controlled signal is exported Control current as bias voltage.
2. voltage-type automatic gain control circuit according to claim 1, wherein, said amplitude sampler comprises: envelope detector and reference voltage source;
Said envelope detector, its input is connected to controlled signal, is used for controlled signal is sampled;
Said reference voltage source is used for independent another reference voltage signal of generation, and this reference voltage signal is sampled as amplitude reference.
3. voltage-type automatic gain control circuit according to claim 2; Wherein, Said envelope detector is the difference channel envelope detector; This difference channel envelope detector comprises: first difference NMOS pipe (NMOS1), second difference NMOS pipe (NMOS2) and first tail current NMOS pipe (NMOS3), wherein:
The grid end of said first difference NMOS pipe (NMOS1) and said second difference NMOS pipe (NMOS2) is respectively as two inputs of difference channel, and its drain terminal is connected to supply voltage (VDD) jointly, and its source end is as the output of difference channel envelope detector;
The grid end of said first tail current NMOS pipe (NMOS3) is connected to difference direct current biasing end (Bias1), and its source end is connected to ground, and its drain terminal is connected to the output of said difference channel envelope detector.
4. voltage-type automatic gain control circuit according to claim 3, wherein, said reference voltage source comprises:
The 4th NMOS manages (NMOS4), and its grid end is connected to reference voltage; Its drain terminal is connected to supply voltage (VDD);
The 5th NMOS manages (NMOS5), and its grid end is connected to bias voltage end (Bias2); Its drain terminal is connected to the source end of the 4th NMOS pipe (NMOS4), as the output of this reference voltage source; Its source end ground connection.
5. voltage-type automatic gain control circuit according to claim 4, wherein,
The 4th NMOS pipe (NMOS4) of said reference voltage source is measure-alike with the first difference NMOS pipe (NMOS1) of said difference channel envelope detector;
The 4th NMOS pipe (NMOS4) of said reference voltage source is that the first tail current source NMOS of said difference channel envelope detector manages the half the of (NMOS3) size;
The bias voltage of bias voltage end (Bias2) is consistent with the bias voltage of difference direct current biasing end (Bias1) in the difference channel envelope detector in the said reference voltage source.
6. voltage-type automatic gain control circuit according to claim 2, wherein, said voltage follower comprises: the first voltage follower unit and the second voltage follower unit, wherein:
The said first voltage follower unit is a unity gain amplifier; Its first input end is connected to the output of envelope detector; Its second input is connected with output; Its output is used for the AC signal of envelope detector and the bias direct current voltage isolation of bias current sources as first output of voltage follower;
The said second voltage follower unit is a unity gain amplifier; Its input is connected to the output of reference voltage source; Its second input is connected with output; Its output is used for the bias direct current voltage isolation with reference voltage source and bias current sources as second output of voltage follower.
7. voltage-type automatic gain control circuit according to claim 6, wherein, the said resistance at a distance from alternating current comprises: the first separated alternating current resistance unit and the second separated alternating current resistance unit:
Said first input at a distance from alternating current resistance unit is connected with the output of the first voltage follower unit;
Second input at a distance from alternating current resistance unit is connected with the output of the second voltage follower unit;
First output at a distance from the alternating current resistance unit and the second separated alternating current resistance unit interconnects, as the output at a distance from the alternating current resistance.
8. voltage-type automatic gain control circuit according to claim 6, wherein, said bias current sources comprises:
The 6th NMOS manages (NMOS6), and its grid end is connected to first at a distance from the alternating current resistance unit and second output at a distance from alternating current resistance unit, and its source end is connected to the drain terminal of the 7th NMOS pipe, and its drain terminal is connected to supply voltage (VDD);
The 7th NMOS manages (NMOS7), its grid end and its drain terminal short circuit, and be connected to the output of voltage-type automatic gain control circuit jointly, its source end is connected to ground.
9. according to each described voltage-type automatic gain control circuit in the claim 1 to 8, be used for driving voltage being provided to E class CMOS power amplifier, wherein:
The input of said amplitude sampler is connected to the output of E class CMOS power amplifier drive circuit;
The output of said bias current sources is connected to the control end of E class CMOS power amplifier drive circuit.
10. voltage-type automatic gain control circuit according to claim 9, said E class CMOS power amplifier is used for the permanent envelope transceiver system of short-distance wireless communication.
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| CN201210030608.XA CN102571014B (en) | 2012-02-10 | 2012-02-10 | Voltage type automatic gain control circuit |
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| CN201210030608.XA CN102571014B (en) | 2012-02-10 | 2012-02-10 | Voltage type automatic gain control circuit |
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| CN102571014A true CN102571014A (en) | 2012-07-11 |
| CN102571014B CN102571014B (en) | 2014-03-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104950966A (en) * | 2014-03-31 | 2015-09-30 | Hoya株式会社 | Load voltage control device, electronic endoscope and electronic endoscope system |
| CN108964418A (en) * | 2017-05-25 | 2018-12-07 | 中兴通讯股份有限公司 | Voltage sampling circuit and circuit system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104950966A (en) * | 2014-03-31 | 2015-09-30 | Hoya株式会社 | Load voltage control device, electronic endoscope and electronic endoscope system |
| CN104950966B (en) * | 2014-03-31 | 2018-07-17 | Hoya株式会社 | Load voltage control device, fujinon electronic video endoscope and electronic endoscope system |
| CN108964418A (en) * | 2017-05-25 | 2018-12-07 | 中兴通讯股份有限公司 | Voltage sampling circuit and circuit system |
| CN108964418B (en) * | 2017-05-25 | 2021-08-17 | 中兴通讯股份有限公司 | Voltage sampling circuit and circuit system |
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