CN104242847A - Two-stage automatic gain control circuit with compensation and gain compensation method thereof - Google Patents
Two-stage automatic gain control circuit with compensation and gain compensation method thereof Download PDFInfo
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- CN104242847A CN104242847A CN201310223098.2A CN201310223098A CN104242847A CN 104242847 A CN104242847 A CN 104242847A CN 201310223098 A CN201310223098 A CN 201310223098A CN 104242847 A CN104242847 A CN 104242847A
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Abstract
The invention discloses a two-stage automatic gain control circuit with compensation and a gain compensation method thereof; the circuit comprises a first variable gain amplifier, a second variable gain amplifier, a power detection circuit, and an AGC control circuit; an output of the second variable gain amplifier is connected with a detection signal input end of the power detection circuit; a detection result output end of the power detection circuit is connected with an input end of the AGC control circuit; a control output of the AGC control circuit is respectively connected with control signal input ends of the first and second variable gain amplifiers. The power detection circuit and the AGC control circuit can be used to realize twice AGC adjusting functions; compared with a conventional mode in which two power detection circuits and two AGC control circuits are needed, the circuit of the invention can obviously reduce circuit complexity, thus reducing the size of a receiver automatic gain control circuit, and satisfying design demands of minimizing the receiver; in addition system power consumption is reduced, and receiver usage cost is reduced.
Description
Technical field
The present invention relates to signal receiver field, particularly relate to a kind of two-stage automatic gain control circuit with compensation and gain compensating method thereof.
Background technology
In a wireless communication system, transmitter is generally used for coding and modulating data also generates the rf modulated signal being suitable for transmitting, and transmitter launches this rf modulated signal through wireless channel to receiver.Because wireless channel has channel response, there is distortion in the signal therefore launched, and Noise and Interference also can affect signal quality to a certain extent.
Receiver is used for the rf modulated signal that receiver/transmitter is launched, and the signal that adjustment receives is to obtain baseband signal, and digitalized baseband signal is to obtain sampling.As shown in Figure 1, in conventional receiver circuit, if need to carry out double conversion, then need use two power-sensing circuits (power-sensing circuit P1, power-sensing circuit P2) to carry out power detection, and use two groups of AGC control circuits (AGC control circuit 1, AGC control circuit 2) to control variable gain amplifier.Use two groups of AGC control circuits and power-sensing circuit to realize double conversion receiving circuit, add the complexity of automatic gain control circuit, also increase circuit board volume, the design requirement of receiver miniaturization cannot be met; Meanwhile, also can increase system power dissipation, increase receiver use cost.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, the two-stage automatic gain control circuit providing a kind of novel band to compensate and gain compensating method thereof, only need use power-sensing circuit and AGC control circuit can realize the function of twice AGC adjustment, obviously can reduce circuit complexity, reduce the volume of receiver automatic gain control circuit, meet the design requirement of receiver miniaturization; Reduce system power dissipation, reduce receiver use cost.
The object of the invention is to be achieved through the following technical solutions: the two-stage automatic gain control circuit that band compensates, it comprises the first variable gain amplifier, second variable gain amplifier, power-sensing circuit and AGC control circuit, the output of the first variable gain amplifier is connected with the input of the second variable gain amplifier, the output of the second variable gain amplifier is connected with the detection signal input of power-sensing circuit, the testing result output of power-sensing circuit is connected with the input of AGC control circuit, the control of AGC control circuit export respectively with the first variable gain amplifier, the control signal input of the second variable gain amplifier is connected.
Further, be provided with other circuit between the first described variable gain amplifier and the second variable gain amplifier, other circuit comprise filter.The second described variable gain amplifier can the decay of other circuit of effective compensation, and the power that power-sensing circuit is detected equals the power output of the first variable gain amplifier.
The two-stage automatic gain control circuit gain compensating method that band compensates, it comprises the following steps:
S1: the fading gain first obtaining other circuit, then initialization second variable gain amplifier, initial value is the fading gain of other circuit;
S2: adjust the first variable gain amplifier, the power detection value that power-sensing circuit is obtained reaches requirement (0dbm or other values);
S3: when the first variable-gain amplifier gain has reached maximum or minimum, when power detection value still cannot be made to reach requirement, continues the gain of adjustment second variable gain amplifier, makes power detection value reach requirement.
The invention has the beneficial effects as follows: only need use power-sensing circuit and AGC control circuit can realize the function of twice AGC adjustment, comparatively need the traditional approach of use two power-sensing circuits and two AGC control circuits, significantly reduce circuit complexity, reduce the volume of receiver automatic gain control circuit, meet the design requirement of receiver miniaturization; Reduce system power dissipation simultaneously, reduce receiver use cost.
Accompanying drawing explanation
Fig. 1 is prior art two-stage automatic gain control circuit structure schematic diagram;
Fig. 2 is two-stage automatic gain control circuit structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited to the following stated.
As shown in Figure 2, the two-stage automatic gain control circuit that band compensates, it comprises the first variable gain amplifier VGA1, second variable gain amplifier VGA2, power-sensing circuit and AGC control circuit, the output of the first variable gain amplifier is connected with the input of the second variable gain amplifier, the output of the second variable gain amplifier is connected with the detection signal input of power-sensing circuit, the testing result output of power-sensing circuit is connected with the input of AGC control circuit, the control of AGC control circuit export respectively with the first variable gain amplifier, the control signal input of the second variable gain amplifier is connected.
Further, be provided with other circuit between the first described variable gain amplifier and the second variable gain amplifier, other circuit comprise filter.
Further, the second described variable gain amplifier can the decay of other circuit of effective compensation, and the power that power-sensing circuit is detected equals the power output of the first variable gain amplifier.
The two-stage automatic gain control circuit gain compensating method that band compensates, it comprises the following steps:
S1: the fading gain first obtaining other circuit, then initialization second variable gain amplifier, initial value is the fading gain of other circuit;
S2: adjust the first variable gain amplifier, the power detection value that power-sensing circuit is obtained reaches requirement (0dbm or other values);
S3: when the first variable-gain amplifier gain has reached maximum or minimum, when power detection value still cannot be made to reach requirement, continues the gain of adjustment second variable gain amplifier, makes power detection value reach requirement.
Claims (4)
1. the two-stage automatic gain control circuit of band compensation, it is characterized in that: it comprises the first variable gain amplifier, second variable gain amplifier, power-sensing circuit and AGC control circuit, the output of the first variable gain amplifier is connected with the input of the second variable gain amplifier, the output of the second variable gain amplifier is connected with the detection signal input of power-sensing circuit, the testing result output of power-sensing circuit is connected with the input of AGC control circuit, the control of AGC control circuit export respectively with the first variable gain amplifier, the control signal input of the second variable gain amplifier is connected.
2. the two-stage automatic gain control circuit of band compensation according to claim 1, it is characterized in that: be provided with other circuit between the first described variable gain amplifier and the second variable gain amplifier, the decay that other circuit cause is compensated by the second variable gain amplifier.
3. the two-stage automatic gain control circuit of band compensation according to claim 2, is characterized in that: other described circuit comprise filter.
4. the two-stage automatic gain control circuit gain compensating method of band compensation, is characterized in that: it comprises the following steps:
S1: initialization second variable gain amplifier, initial value is the fading gain of other circuit;
S2: adjust the first variable gain amplifier, the power detection value that power-sensing circuit is obtained reaches requirement;
S3: when the first variable-gain amplifier gain has reached maximum or minimum, when power detection value still cannot be made to reach requirement, continues the gain of adjustment second variable gain amplifier, makes power detection value reach requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310223098.2A CN104242847A (en) | 2013-06-06 | 2013-06-06 | Two-stage automatic gain control circuit with compensation and gain compensation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310223098.2A CN104242847A (en) | 2013-06-06 | 2013-06-06 | Two-stage automatic gain control circuit with compensation and gain compensation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104242847A true CN104242847A (en) | 2014-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310223098.2A Pending CN104242847A (en) | 2013-06-06 | 2013-06-06 | Two-stage automatic gain control circuit with compensation and gain compensation method thereof |
Country Status (1)
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| CN (1) | CN104242847A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113019A (en) * | 2019-04-29 | 2019-08-09 | 深圳锐越微技术有限公司 | Two-stage audio gain circuit and voice frequency terminal based on analog-to-digital conversion |
-
2013
- 2013-06-06 CN CN201310223098.2A patent/CN104242847A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113019A (en) * | 2019-04-29 | 2019-08-09 | 深圳锐越微技术有限公司 | Two-stage audio gain circuit and voice frequency terminal based on analog-to-digital conversion |
| WO2020221028A1 (en) * | 2019-04-29 | 2020-11-05 | 深圳锐越微技术有限公司 | Analog-to-digital conversion-based two-stage audio gain circuit and audio terminal |
| CN110113019B (en) * | 2019-04-29 | 2021-10-19 | 深圳锐越微技术有限公司 | Two-stage audio gain circuit based on analog-to-digital conversion and audio terminal |
| US11973479B2 (en) | 2019-04-29 | 2024-04-30 | Radiawave Technologies Co., Ltd. | Two-stage audio gain circuit based on analog-to-digital conversion and audio terminal |
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Application publication date: 20141224 |
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| RJ01 | Rejection of invention patent application after publication |