CN1141797C - AGC circuit for large dynamic input signal - Google Patents
AGC circuit for large dynamic input signal Download PDFInfo
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- CN1141797C CN1141797C CNB001254715A CN00125471A CN1141797C CN 1141797 C CN1141797 C CN 1141797C CN B001254715 A CNB001254715 A CN B001254715A CN 00125471 A CN00125471 A CN 00125471A CN 1141797 C CN1141797 C CN 1141797C
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Abstract
The present invention discloses an automatic gain control circuit for large dynamic input signals, which can compensate nonlinearity of diodes in small signal detection and enlarge signal dynamic ranges. The present invention uses a two-stage controlled gain amplifying circuit for realizing automatic gain control capacity in circuits, and input signals are dynamically divided into two stages; the electric level is judged whether the electric level is transferred or not according to different dynamic ranges of the input signals, and the control state of the two-stage gain control circuit is determined. The present invention comprises an electric level transfer circuit, part of the processed detected signals are transferred to a control circuit in one stage, and the left signals are transferred to a control circuit in the other stage after passing through the electric level transfer circuit.
Description
Technical field
The present invention relates to a kind of AGC circuit for large dynamic input signal, be used for that wireless signal receives, second-rate wired reception and other fields.
Background technology
In the present prior art, the detecting circuit that automatic gain control circuit generally is made of single gain amplifying circuit, diode, direct voltage compare circuit and control circuit is formed, wherein gain amplifying circuit is used for amplifying signal but its gain A is an amount that changes, its data depend on the control signal Vc that control circuit produces, control signal Vc depends on the detecting circuit Vd to output signal level again, and Vd realizes by the AC signal detection of detecting circuit to gain amplifying circuit output.Though Japanese patent specification JP-55071306A2 has disclosed an automatic gain control circuit that is made of two-stage controlled gain amplifying circuit, carry out twice detection at radio frequency and intermediate frequency, then rectified signal is carried out integrated treatment, carry out the control of loop gain again, but the circuit characteristic of this control method depends on the detection characteristic of diode to a great extent, and diode is when the small-signal detection, therefore its nonlinearity erron also can not be ignored, and has the output level instability, can not expand the dynamic shortcoming of input signal effectively.
Summary of the invention
Task of the present invention provides the automatic gain control circuit that a kind of signal that is used for communication channel receives, can compensate the nonlinear characteristic of diode serious distortion when the small-signal detection and the detecting circuit that causes thus, control voltage error, guarantee the constant of system's output level; Simultaneously, guarantee quality in the transmission of the dynamic range internal information of input signal.
In order to solve the task that epimere proposes, solution of the present invention is: a kind of big dynamic input signal scope automatic gain control circuit, it is characterized in that: after the signal of reception is handled through the preposing signal process circuit with wide dynamic range feature, at first through prime controlled gain amplifying circuit, after the AC signal that produces of level controlled gain amplifying circuit become direct current signal through coupling circuit, detecting circuit, after dc amplification circuit amplifies, one road signal through after the level control circuit produce the gain that a control signal removes to control back level controlled gain amplifying circuit; Another road signal carries out that level shifts after after the direct current comparison amplifier amplifies, produce the gain that a control signal removes to control prime controlled gain amplifying circuit by the prime control circuit through level shifter.
A kind of big dynamic input signal scope automatic gain control circuit, it is characterized in that: after the signal of reception is handled through the preposing signal process circuit with wide dynamic range feature, at first through prime controlled gain amplifying circuit, after the AC signal that produces of level controlled gain amplifying circuit become direct current signal through coupling circuit, detecting circuit, after dc amplification circuit amplified, one road signal produced the gain that a control signal removes to control prime controlled gain amplifying circuit through the prime control circuit; Another road signal carries out that level shifts after after the direct current comparison amplifier amplifies, produce the gain that a control signal removes to control back level controlled gain amplifying circuit by back level control circuit through level shifter.
A kind of big dynamic input signal scope automatic gain control circuit, it is characterized in that: after the signal of reception is handled through the preposing signal process circuit with wide dynamic range feature, the AC signal that produces through prime controlled gain amplifying circuit becomes direct current signal through coupling circuit coupling output first via signal by detecting circuit, after dc amplification circuit amplified, one road signal produced the gain that a control signal removes to control prime controlled gain amplifying circuit through the prime control circuit; Another road signal carries out that level shifts after after the direct current comparison amplifier amplifies, produce the gain that a control signal removes to control back level controlled gain amplifying circuit by back level control circuit through level shifter; The second road signal of coupling circuit coupling output amplifies the back through a back level controlled gain amplifying circuit and exports.
A kind of big dynamic input signal scope automatic gain control circuit, it is characterized in that: the signal of reception enters after handling through the preposing signal process circuit with wide dynamic range feature, the AC signal that produces through prime controlled gain amplifying circuit becomes direct current signal through coupling circuit coupling output first via signal by detecting circuit, after dc amplification circuit amplifies, one road signal through after the level control circuit produce the gain that a control signal removes to control back level controlled gain amplifying circuit; Another road signal carries out that level shifts after after the direct current comparison amplifier amplifies, produce the gain that a control signal removes to control prime controlled gain amplifying circuit by the prime control circuit through level shifter; The second road signal of coupling circuit coupling output amplifies the back through a back level controlled gain amplifying circuit and exports.
Because above-mentioned solution has adopted level shifter, input signal dynamically is divided into two sections, realize the AGC control of circuit with two-stage controlled gain amplifying circuit, make control circuit when small-signal, the result who not exclusively depends on diode detection, thereby also just avoided the non-linear error that produces because of diode detection, made circuit have enough big input signal dynamic range, it is constant that output level keeps.
Description of drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the block diagram of the 1st kind of execution mode of automatic gain of the present invention (AGC) control circuit.
Fig. 2 is the preposing signal process circuit figure in the invention.
Fig. 3 is the low frequency power distributor circuit figure of coupling circuit.
Fig. 4 is detecting circuit figure.
Fig. 5 is a direct current in-phase amplifier circuit diagram.
Fig. 6 is level shifter figure.
Fig. 7 is a relatively amplification circuit diagram of direct current.
Fig. 8 is the block diagram of the 2nd kind of execution mode of automatic gain of the present invention (AGC) control circuit.
Fig. 9 is the block diagram of the 3rd kind of execution mode of automatic gain of the present invention (AGC) control circuit.
Figure 10 is the block diagram of the 4th kind of execution mode of automatic gain of the present invention (AGC) control circuit.
Embodiment
Figure 1 shows that the block diagram of the 1st kind of execution mode of automatic gain of the present invention (AGC) control circuit.Signal is the preposing signal process circuit 1 through having the wide dynamic range characteristic at first, amplify, mixing, enter automatic gain control (AGC) circuit after the processing such as filtering, this agc circuit by the controlled gain amplifying circuit (for expand input signal dynamically, the controlled gain amplifying circuit is divided into two-stage to be finished, as circuit among Fig. 12 and circuit 3.), coupling circuit 4, detecting circuit 5, direct current signal amplifies comparison circuit 6,9, level shifter 8 and control circuit 7, more than 10 parts are formed, the operation principle of this agc circuit is, amplify through circuit 1, mixing, the radiofrequency signal after filtering etc. are handled are through circuit 2, and circuit 3 amplifies, again through overcoupled circuits 4, be coupled out one tunnel coupled signal that can react the output signal size, this coupled signal enters detecting circuit 5 and carries out detection, after the low-pass filtering, in circuit 6, carry out again being divided into two-way after direct current relatively amplifies, the gain that one road signal removes ride gain amplifying circuit 3 through control circuit 7, another road signal goes to compare and enlarge or subtraction in the circuit 9 through behind the level shifter 8 again, and its result of calculation is used to control the gain of controlled gain amplifying circuit 2 through control circuit 10.
Below the each several part of this circuit block diagram is described in detail:
Preposing signal process circuit 1: this circuit does not have much differences with general conventional preposing signal process circuit, the main effect of this circuit is: the high-frequency signal that receives is amplified, down-conversion, processing such as filtering become the signal easily handled by agc circuit (because of the general work frequency of agc circuit can be very not high) with it.So it is little that this circuit must possess noise, the advantage that dynamic range is big.This circuit has not just described in detail at this Signal Processing process.The basic principle block diagram of this circuit as shown in Figure 2.
Controllable gain amplifying circuit 2,3: because the development of integrated circuit industry, it is more and more simpler that this partial circuit has become, will not manage or transistor with PIN before not resembling, field effect transistor waits to be done, and present even available monolithic integrated circuit is finished, resemble the RF2607 of RFMD company, RF2609, the IVA-05208 of Hewlett-Packard Corporation, IVA 05228 circuit such as grade.Just when practical application, to reasonably select in conjunction with the index of device according to the practical application place.
Signal coupling circuit 4: when higher or output level was big in signal frequency, the method for available microstrip line coupling realized, but the operating frequency of general agc circuit can be very not high, so can adopt resistor network to carry out the method for power division.Typical resistor power distribution network as shown in Figure 3.
Detecting circuit 5: this circuit adopts diode polyphone detector circuit, and this detecting circuit is made up of diode D and RC low pass filter.Diode will select for use conducting voltage little usually, the germanium tube that internal resistance is little.The effect of RC circuit has two: the one, and as the load of wave detector, the 2nd, play the bypass effect of high-frequency signal.This detecting circuit as shown in Figure 4.
Dc amplification circuit 6: the direct current signal after adopting operational amplifier to detection carries out homophase and amplifies, the voltage gain of this dc amplification circuit is adjusted by a potentiometer P, the foundation of its adjustment is the output signal level requirement of whole agc circuit, and the output voltage of this operational amplifier is controlled through the gain of 7 pairs of controllable gain amplifying circuits 3 of control circuit.Thereby stablized the output signal level of whole agc circuit.This dc amplification circuit 6 as shown in Figure 5.
Control circuit 7: this control circuit is as the buffer circuit between operational amplifier and the controllable gain amplifying circuit 3, as realize with the form of follower.In order to avoid influencing each other between the two.
Level shifter 8: level shifter is a core of the present invention, mentioned when setting forth design philosophy of the present invention in front: the present invention dynamically is divided into two sections with input signal, realize AGC control in the circuit with two-stage controlled gain amplifying circuit, that petty every index request according to system, determine the separation of gain controlling, thereby determine that level shifts and the reference point of controllable gain amplifying circuit 2 controls.Because diode has unidirectional conduction, thus this circuit general simple be that form with diode or diode polyphone realizes (D1 among Fig. 6, D2 finish the function that level shifts) as shown in Figure 6.If we set the reference point of level transfer is V
R, that is petty, as the output voltage V＜V of direct current in-phase amplification circuit 6
RThe time, controllable gain amplifying circuit 3 starts to control, and level does not shift, so relatively amplifying circuit 9 is inoperative for direct current, controllable gain amplifying circuit 2 is in the maximum gain magnifying state, this shows, control circuit not exclusively depends on the result of diode detection when small-signal, thereby has also just avoided the non-linear error that produces because of diode detection; Output voltage V＞V when direct current in-phase amplification circuit 6
RThe time, level shifts, direct current comparison amplifying circuit 9 begins to work, at this moment, controllable gain amplifying circuit 2 begins to start to control, and controllable gain amplifying circuit 3 also is in the gain controlling state simultaneously, like this, just expanded the dynamic range of input signal widely, also can guarantee that output signal level is stable simultaneously.
Direct current is amplifying circuit 9 relatively: adopt operational amplifier that the direct current signal level after shifting is compared and enlarged, or adopt subtracter that the direct current signal level after shifting is carried out subtraction, specifically to adopt the circuit of which kind of form, decide according to the control characteristic of controllable gain amplifying circuit 2.If the control characteristic of controllable gain amplifying circuit 2 is that (control voltage is big more, and the gain of controllable gain amplifying circuit 2 is high more for the direct proportion type.), then this direct current compares amplifying circuit as shown in Figure 7.
Block diagram referring to the 2nd kind of execution mode of Fig. 8 automatic gain of the present invention (AGC) control circuit, signal is the preposing signal process circuit 1 through having the wide dynamic range characteristic at first, amplify, mixing, enter automatic gain control (AGC) circuit after the processing such as filtering, (in order to expand the dynamic of input signal, the controlled gain amplifying circuit is divided into two-stage to be finished this agc circuit, as circuit among Fig. 12 and circuit 3 by the controlled gain amplifying circuit.), coupling circuit 4, detecting circuit 5, direct current signal amplifies comparison circuit 6,9, level shifter 8 and control circuit 7, more than 10 parts are formed, the operation principle of this agc circuit is, amplify through circuit 1, mixing, the radiofrequency signal after filtering etc. are handled are through circuit 2, and circuit 3 amplifies, again through overcoupled circuits 4, be coupled out one tunnel coupled signal that can react the output signal size, this coupled signal enters detecting circuit 5 and carries out detection, after the low-pass filtering, in circuit 6, carry out again being divided into two-way after direct current relatively amplifies, the gain that one road signal removes ride gain amplifying circuit 2 through control circuit 10, another road signal goes to compare and enlarge or subtraction in the circuit 9 through behind the level shifter 8 again, and its result of calculation is used to control the gain of controlled gain amplifying circuit 3 through control circuit 7.
Block diagram referring to the 3rd kind of execution mode of Fig. 9 automatic gain of the present invention (AGC) control circuit, signal is the preposing signal process circuit 1 through having the wide dynamic range characteristic at first, amplify, mixing, enter automatic gain control (AGC) circuit after the processing such as filtering, (in order to expand the dynamic of input signal, the controlled gain amplifying circuit is divided into two-stage to be finished this agc circuit, as circuit among Fig. 12 and circuit 3 by the controlled gain amplifying circuit.), coupling circuit 4, detecting circuit 5, direct current signal amplifies comparison circuit 6,9, level shifter 8 and control circuit 7, more than 10 parts are formed, the operation principle of this agc circuit is, amplify through circuit 1, mixing, the radiofrequency signal after filtering etc. are handled is amplified through circuit 2, again through overcoupled circuits 4, be coupled out two paths of signals, one the road delivers to circuit 3 amplifies, and the coupled signal that the output signal size can be reacted in another road enters detecting circuit 5 and carries out detection, after the low-pass filtering, in circuit 6, carry out again being divided into two-way after direct current relatively amplifies, the gain that one road signal removes ride gain amplifying circuit 2 through control circuit 10, another road signal goes to compare and enlarge or subtraction in the circuit 9 through behind the level shifter 8 again, and its result of calculation is used to control the gain of controlled gain amplifying circuit 3 through control circuit 7.Be to set TL translation level in the case with the intermediate level between the circuit 2,3.
Block diagram referring to the 4th kind of execution mode of Figure 10 automatic gain of the present invention (AGC) control circuit, signal is the preposing signal process circuit 1 through having the wide dynamic range characteristic at first, amplify, mixing, enter automatic gain control (AGC) circuit after the processing such as filtering, (in order to expand the dynamic of input signal, the controlled gain amplifying circuit is divided into two-stage to be finished this agc circuit, as circuit among Fig. 12 and circuit 3 by the controlled gain amplifying circuit.), coupling circuit 4, detecting circuit 5, direct current signal amplifies comparison circuit 6,9, level shifter 8 and control circuit 7, more than 10 parts are formed, the operation principle of this agc circuit is, amplify through circuit 1, mixing, the radiofrequency signal after filtering etc. are handled is amplified through circuit 2, again through overcoupled circuits 4, be coupled out two paths of signals, one the road delivers to circuit 3 amplifies, and the coupled signal that the output signal size can be reacted in another road enters detecting circuit 5 and carries out detection, after the low-pass filtering, in circuit 6, carry out again being divided into two-way after direct current relatively amplifies, the gain that one road signal removes ride gain amplifying circuit 3 through control circuit 7, another road signal goes to compare and enlarge or subtraction in the circuit 9 through behind the level shifter 8 again, and its result of calculation is used to control the gain of controlled gain amplifying circuit 2 through control circuit 10.Be to set TL translation level in the case with the intermediate level between the circuit 2,3.
Certainly; the embodiment of automatic gain of the present invention (AGC) control circuit; be not limited to above several; if there are other modes also to adopt level shifter; input signal dynamically is divided into two sections; and whether shift by the Different Dynamic scope of input signal decision level; and the state of a control of decision two-stage gain control circuit; direct current signal after the detecting circuit detection; one the tunnel leads to the one-level control circuit after treatment; another grade control circuit is led to through behind the level shifter in another road, also belongs to protection scope of the present invention.
Claims (4)
1. AGC circuit for large dynamic input signal, it is characterized in that: the signal of reception enters described automatic gain control circuit after handling through the preposing signal process circuit (1) with wide dynamic range feature, at first through prime controlled gain amplifying circuit (2), the AC signal that back level controlled gain amplifying circuit (3) produces is through coupling circuit (4), detecting circuit (5) becomes direct current signal, after dc amplification circuit (6) amplifies, one road signal through after a level control circuit (7) produce the gain that a control signal removes to control back level controlled gain amplifying circuit (3); Another road signal carries out that level shifts after after direct current comparison amplifier (9) amplifies, produce the gain that a control signal removes to control prime controlled gain amplifying circuit (2) by prime control circuit (10) through level shifter (8).
2. AGC circuit for large dynamic input signal, it is characterized in that: the signal of reception enters described automatic gain control circuit after handling through the preposing signal process circuit (1) with wide dynamic range feature, at first through prime controlled gain amplifying circuit (2), the AC signal that back level controlled gain amplifying circuit (3) produces is through coupling circuit (4), detecting circuit (5) becomes direct current signal, after dc amplification circuit (6) amplified, one road signal produced the gain that a control signal removes to control prime controlled gain amplifying circuit (2) through prime control circuit (10); Another road signal carries out that level shifts after after direct current comparison amplifier (9) amplifies, produce the gain that a control signal removes to control back level controlled gain amplifying circuit (3) by a back level control circuit (7) through level shifter (8).
3. AGC circuit for large dynamic input signal, it is characterized in that: the signal of reception enters described automatic gain control circuit after handling through the preposing signal process circuit (1) with wide dynamic range feature, the AC signal that produces through prime controlled gain amplifying circuit (2) becomes direct current signal through coupling circuit (4) coupling output first via signal by detecting circuit (5), after dc amplification circuit (6) amplified, one road signal produced the gain that a control signal removes to control prime controlled gain amplifying circuit (2) through prime control circuit (10); Another road signal carries out that level shifts after after direct current comparison amplifier (9) amplifies, produce the gain that a control signal removes to control back level controlled gain amplifying circuit (3) by a back level control circuit (7) through level shifter (8); The second road signal of coupling circuit (4) coupling output amplifies the back through a back level controlled gain amplifying circuit (3) and exports.
4, a kind of AGC circuit for large dynamic input signal, it is characterized in that: the signal of reception enters described automatic gain control circuit after handling through the preposing signal process circuit (1) with wide dynamic range feature, the AC signal that produces through prime controlled gain amplifying circuit (2) becomes direct current signal through coupling circuit (4) coupling output first via signal by detecting circuit (5), after dc amplification circuit (6) amplifies, one road signal through after a level control circuit (7) produce the gain that a control signal removes to control back level controlled gain amplifying circuit (3); Another road signal carries out that level shifts after after direct current comparison amplifier (9) amplifies, produce the gain that a control signal removes to control prime controlled gain amplifying circuit (2) by prime control circuit (10) through level shifter (8); The second road signal of coupling circuit (4) coupling output amplifies the back through a back level controlled gain amplifying circuit (3) and exports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001254715A CN1141797C (en) | 2000-09-26 | 2000-09-26 | AGC circuit for large dynamic input signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001254715A CN1141797C (en) | 2000-09-26 | 2000-09-26 | AGC circuit for large dynamic input signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1336730A CN1336730A (en) | 2002-02-20 |
| CN1141797C true CN1141797C (en) | 2004-03-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001254715A Expired - Fee Related CN1141797C (en) | 2000-09-26 | 2000-09-26 | AGC circuit for large dynamic input signal |
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| Country | Link |
|---|---|
| CN (1) | CN1141797C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102572336A (en) * | 2010-12-24 | 2012-07-11 | 夏普株式会社 | Receiving circuit, semiconductor integrated circuit device, television tuner, and television receiver |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7596193B2 (en) * | 2005-11-09 | 2009-09-29 | Via Telecom, Inc. | Variable bandwidth automatic gain control |
| CN101155160B (en) * | 2006-09-29 | 2010-06-16 | 锐迪科科技有限公司 | Up-conversion mixer |
| CN104393851B (en) * | 2014-11-18 | 2017-05-17 | 中环天仪股份有限公司 | Automatic gain control circuit applied to ultrasonic heat meter |
| CN105959017A (en) * | 2016-06-28 | 2016-09-21 | 中国科学院微电子研究所 | Automatic gain control circuit and method and software radio receiver adopting automatic gain control circuit |
| CN106160762B (en) * | 2016-06-28 | 2021-03-12 | 中国科学院微电子研究所 | Automatic gain control system and method for broadband receiver and broadband receiver |
| WO2020019169A1 (en) * | 2018-07-24 | 2020-01-30 | 高维度（深圳）生物信息智能应用有限公司 | Electrooculogram signal processing circuit and electrooculogram-based human-computer interaction system |
-
2000
- 2000-09-26 CN CNB001254715A patent/CN1141797C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102572336A (en) * | 2010-12-24 | 2012-07-11 | 夏普株式会社 | Receiving circuit, semiconductor integrated circuit device, television tuner, and television receiver |
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| Publication number | Publication date |
|---|---|
| CN1336730A (en) | 2002-02-20 |
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Owner name: ZTE CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHENZHENG CITY ZTE CO., LTD. |
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Address after: 518057 Department of law, Zhongxing building, South hi tech Industrial Park, Nanshan District hi tech Industrial Park, Guangdong, Shenzhen Patentee after: ZTE Corporation Address before: 518057 Department of law, Zhongxing building, South hi tech Industrial Park, Nanshan District hi tech Industrial Park, Guangdong, Shenzhen Patentee before: Zhongxing Communication Co., Ltd., Shenzhen City |
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Granted publication date: 20040310 Termination date: 20130926 |