CN203278759U - Two-stage automatic gain control circuit with compensation function - Google Patents
Two-stage automatic gain control circuit with compensation function Download PDFInfo
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- CN203278759U CN203278759U CN 201320324457 CN201320324457U CN203278759U CN 203278759 U CN203278759 U CN 203278759U CN 201320324457 CN201320324457 CN 201320324457 CN 201320324457 U CN201320324457 U CN 201320324457U CN 203278759 U CN203278759 U CN 203278759U
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- circuit
- variable gain
- gain amplifier
- agc
- control circuit
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- Control Of Amplification And Gain Control (AREA)
Abstract
The utility model discloses a two-stage automatic gain control (AGC) circuit with a compensation function, comprising a first variable gain amplifier, a second variable gain amplifier, a power detection circuit and an AGC control circuit; an output terminal of the second variable gain amplifier is in connection with a detection signal input terminal of the power detection circuit; a detection result output terminal of the power detection circuit is in connection with an input terminal of the AGC control circuit; a control output terminal of the AGC control circuit is respectively in connection with control signal input terminals of the first variable gain amplifier and the second variable gain amplifier. The two-stage AGC circuit with the compensation function can realize twice AGC adjustment functions only using the power detection circuit and the AGC control circuit; compared with a traditional mode of using two power detection circuits and two AGC control circuits, the two-stage AGC circuit with a compensation function substantially reduces circuit complexity, minimizes a size of a receiver AGC circuit and meets design requirements of miniaturization of a receiver; meanwhile power consumption and use cost of the receiver are reduced.
Description
Technical field
The utility model relates to the signal receiver field, particularly relates to a kind of two-stage automatic gain control circuit with compensation.
Background technology
In wireless communication system, transmitter generally is used for coding and modulating data and generates the rf modulated signal that is suitable for transmitting, and transmitter is launched this rf modulated signal through wireless channel to receiver.Because wireless channel has channel response, therefore there is distortion in the signal of emission, and Noise and Interference also can affect signal quality to a certain extent.
Receiver is used for the rf modulated signal of receiver/transmitter emission, and the signal that adjustment receives is with the acquisition baseband signal, and the digitlization baseband signal is to obtain sampling.As shown in Figure 1, in traditional receiving circuit, if need to carry out double conversion, need to 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) that variable gain amplifier is controlled.Use two groups of AGC control circuits and power-sensing circuit to realize the double conversion receiving circuit, increased the complexity of automatic gain control circuit, also increased the circuit board volume, can't satisfy the design requirement of receiver miniaturization; Simultaneously, also can increase system power dissipation, increase the receiver use cost.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, the two-stage automatic gain control circuit that provides a kind of novel band to compensate, only need to use a power-sensing circuit and AGC control circuit can realize the function that twice AGC adjusts, can obviously reduce circuit complexity, reduce the volume of receiver automatic gain control circuit, satisfy the design requirement of receiver miniaturization; Reduce system power dissipation, reduce the receiver use cost.
the purpose of this utility model is achieved through the following technical solutions: the two-stage automatic gain control circuit of band compensation, it comprises the first variable gain amplifier, the 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 output respectively with the first variable gain amplifier, the control signal input of the second variable gain amplifier is connected.
Be provided with other circuit between described the first variable gain amplifier and the second variable gain amplifier, other circuit comprise filter circuit, the decay that other circuit cause is compensated by the second variable gain amplifier, makes power that power-sensing circuit detects equal the power output of the first variable gain amplifier.
The beneficial effects of the utility model are: only need to use a power-sensing circuit and AGC control circuit can realize the function that twice AGC adjusts, need to use the traditional approach of two power-sensing circuits and two AGC control circuits, obviously reduced circuit complexity, reduce the volume of receiver automatic gain control circuit, satisfied the design requirement of receiver miniaturization; Reduce simultaneously system power dissipation, reduced the receiver use cost.
Description of drawings
Fig. 1 is prior art two-stage automatic gain control circuit structure schematic diagram;
Fig. 2 is the utility model two-stage automatic gain control circuit structure schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection range of the present utility model is not limited to the following stated.
as shown in Figure 2, the two-stage automatic gain control circuit of band compensation, it comprises the first variable gain amplifier VGA1, the 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 output respectively with the first variable gain amplifier, the control signal input of the second variable gain amplifier is connected.
Be provided with other circuit between described the first variable gain amplifier and the second variable gain amplifier, other circuit comprise filter circuit, the decay that other circuit cause is compensated by the second variable gain amplifier, makes power that power-sensing circuit detects equal the power output of the first variable gain amplifier.
Claims (3)
1. be with the two-stage automatic gain control circuit of compensation, it is characterized in that: it comprises the first variable gain amplifier, the 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 output 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 according to claim 1 compensation, it is characterized in that: be provided with other circuit between described the first 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 according to claim 2 compensation, it is characterized in that: described other circuit comprise filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320324457 CN203278759U (en) | 2013-06-06 | 2013-06-06 | Two-stage automatic gain control circuit with compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320324457 CN203278759U (en) | 2013-06-06 | 2013-06-06 | Two-stage automatic gain control circuit with compensation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203278759U true CN203278759U (en) | 2013-11-06 |
Family
ID=49509081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320324457 Expired - Fee Related CN203278759U (en) | 2013-06-06 | 2013-06-06 | Two-stage automatic gain control circuit with compensation function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203278759U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110949015A (en) * | 2018-09-26 | 2020-04-03 | 海德堡印刷机械股份公司 | Two-stage density compensation method |
-
2013
- 2013-06-06 CN CN 201320324457 patent/CN203278759U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110949015A (en) * | 2018-09-26 | 2020-04-03 | 海德堡印刷机械股份公司 | Two-stage density compensation method |
| CN110949015B (en) * | 2018-09-26 | 2021-12-14 | 海德堡印刷机械股份公司 | Two-stage density compensation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHENGDU ZHENXIN TECHNOLOGY CO., LTD. Free format text: FORMER NAME: CHENGDU ARTEC ELECTRONICS CORP. |
|
| CP03 | Change of name, title or address |
Address after: No. 1 high tech Zone Gaopeng road in Chengdu city of Sichuan Province in 610000 Patentee after: CHENGDU CORPRO TECHNOLOGY CO., LTD. Address before: No. 1 high tech Zone Gaopeng road in Chengdu city of Sichuan Province in 610041 Patentee before: Chengdu ARTEC Electronics Corp. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20190606 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |