CN202424634U - Automatic gain control circuit with digital signal compensation function - Google Patents
Automatic gain control circuit with digital signal compensation function Download PDFInfo
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- CN202424634U CN202424634U CN2011205239400U CN201120523940U CN202424634U CN 202424634 U CN202424634 U CN 202424634U CN 2011205239400 U CN2011205239400 U CN 2011205239400U CN 201120523940 U CN201120523940 U CN 201120523940U CN 202424634 U CN202424634 U CN 202424634U
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Abstract
The utility model discloses an automatic gain control circuit with a digital signal compensation function. The automatic gain control circuit comprises one or more controllable attenuation modules, a radio frequency branch and detection circuit, an analog-to-digital (AD) converter, a control algorithm module, a digital-to-analog (DA) converter and a digital signal compensation algorithm module. A radio frequency output signal is sampled through the radio frequency branch and detection circuit, is subjected to AD conversion and is sent into the control algorithm module, a control algorithm is added with a digital signal compensation value and then calculates obtained control output, the obtained control output is subjected to DA conversion, and a controllable attenuator is controlled, so that the automatic gain control with the digital signal compensation function is realized, and the error of the automatic gain control which is caused by a detection difference value of an analog/digital signal is avoided.
Description
Technical field
The utility model discloses a kind of automatic gain control circuit that is used for the band compensated digital signal function of radio frequency amplifying circuit.
Background technology
The cable television network of China adopts the PAL-D/K pattern, and every channel bandwidth is 8MHZ, and routine is 45～550MHZ transmission of analogue signal, 550～860MHZ transmission of digital signals.Along with the continuous popularization of DTV, each cable TV station only keeps 6～8 analog signals at present, and all the other are digital signal entirely.When actual transmissions, the level of digital signal is generally than the low 6～10dB of analog signal.
At present, general automatic gain control (AGC) circuit comes detection signal level through signal is carried out detection, thereby realizes AGC control, can't treat analog signal and the level differences of digital signal in the transmission with a certain discrimination.When analog signal and digital signal mixed transport; When perhaps digital signal transmits; The control algolithm module can think that level of RF signals is on the low side, improves level of RF signals through the attenuation that reduces controlled attenuation module, like this; Automatic gain control circuit can't be realized due AGC function, thereby has influenced the stability of radiofrequency signal.
The utility model content
The utility model technical problem to be solved provides a kind of automatic gain control circuit with the compensated digital signal function, the departure that causes with the detection difference value that solves in the existing conventional control circuit because of analog/digital signal.
In order to solve above-mentioned technical problem, the automatic gain control circuit of the band compensated digital signal function of the utility model comprises:
Controlled attenuation module is used for responsive control signal and decays changeably radio-frequency input signals;
Rf branch and radio frequency detecting circuit are used to detect the radio frequency output signal through controlled attenuation module decay and RF Amplifier Module amplification, output and the corresponding analog voltage of signal;
AD converter is used for converting detected analog voltage into control algolithm module required digital signal value;
The control algolithm module is used to receive the digital signal value that AD converter is exported, and judges current level of RF signals, and adds the compensated digital signal algorithm, the digital signal value of the required attenuation of the controlled attenuation module of output after calculating;
The DA transducer is used for converting the digital signal value of control algolithm module output into control controlled attenuation module attenuation analog voltage;
The digital compensation algoritic module is used for current level of RF signals value that the control algolithm module is calculated, adds the side-play amount of the signal level value that causes because of the analog/digital signal mixed transport, obtains the actual required attenuation of current controlled attenuation module.
Said control algolithm module is provided with the compensated digital signal value, and described compensated digital signal value settings is 0～9dB.
Through the rf branch detecting circuit radio frequency output signal is sampled in the circuit; After the AD conversion, send into the control algolithm module; On the basis of the level value that the control algolithm module receives, add the pairing side-play amount of digital compensation value again after, obtain the average level value of the level value or the analog/digital mixing signal of actual digital signal; Control output is controlled controllable attenuator after the DA conversion again, thereby realizes the automatic gain control of band digital compensation function.
The utility model circuit is realized the closed-loop control to radiofrequency signal, to guarantee the stable output of radiofrequency signal, behind the adding digital compensation algorithm, can guarantee the signal stabilization when the analog/digital signal mixed transport.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is done further detailed explanation.
Accompanying drawing is the electric theory diagram of the embodiment of the utility model.
Embodiment
Shown in accompanying drawing, the automatic gain control circuit of band compensated digital signal function comprises:
Controlled attenuation module is used for responsive control signal and decays changeably radio-frequency input signals, and the controlled attenuation module of the utility model is one or more;
Rf branch and detecting circuit are used to detect the radio frequency output signal through above-mentioned controlled attenuation module decay and RF Amplifier Module amplification, output and the corresponding analog voltage of signal;
AD converter is used for converting detected analog voltage into control algolithm module required digital signal value;
The control algolithm module is used to receive the digital signal value that AD converter is exported, and judges current level of RF signals, and adds the compensated digital signal algorithm, the digital signal value of the required attenuation of the controlled attenuation module of output after calculating;
The DA transducer is used for converting the digital signal value of control algolithm module output into control controlled attenuation module attenuation analog voltage;
The digital compensation algoritic module is used for current level of RF signals value that the control algolithm module is calculated, adds the side-play amount of the signal level value that causes because of the analog/digital signal mixed transport, obtains the actual required attenuation of current controlled attenuation module.
The utility model can be provided with the compensated digital signal value to the control algolithm module according to the actual conditions of the analog and digital signal in the cable TV network, and settings is between 0～9dB.
Radio-frequency input signals is sent into RF Amplifier Module after certain attenuation of controlled attenuation module; At RF output end signal is carried out branch and detection, obtain with the corresponding analog voltage of signal, send into AD converter and convert digital signal value into; The control algolithm module receives the compensated digital signal value; Judge current level of RF signals value, and add the digital compensation algorithm, obtain the level value of actual digital signal or analog/digital mixing signal; Make comparisons with the radio frequency reference level value of setting; The digital signal value of the required attenuation of the controlled attenuation module of output converts digital signal value into analog voltage by the DA transducer again after calculating, and more controlled attenuation module is carried out the control of attenuation.
The foregoing description limits the utility model never in any form, and every employing is equal to the technical scheme that replacement or the mode of equivalent transformation obtain and all drops in the protection range of the utility model.
Claims (3)
1. automatic gain control circuit with the compensated digital signal function is characterized in that comprising:
Controlled attenuation module is used for responsive control signal and decays changeably radio-frequency input signals;
Rf branch and radio frequency detecting circuit are used to detect the radio frequency output signal through controlled attenuation module decay and RF Amplifier Module amplification, output and the corresponding analog voltage of signal;
AD converter is used for converting detected analog voltage into control algolithm module required digital signal value;
The control algolithm module is used to receive the digital signal value that AD converter is exported, and judges current level of RF signals, and adds the compensated digital signal algorithm, the digital signal value of the required attenuation of the controlled attenuation module of output after calculating;
The DA transducer is used for converting the digital signal value of control algolithm module output into control controlled attenuation module attenuation analog voltage;
The digital compensation algoritic module is used for current level of RF signals value that the control algolithm module is calculated, adds the side-play amount of the signal level value that causes because of the analog/digital signal mixed transport, obtains the actual required attenuation of current controlled attenuation module.
2. the automatic gain control circuit of band compensated digital signal function according to claim 1 is characterized in that: said control algolithm module is provided with the compensated digital signal value.
3. the automatic gain control circuit of band compensated digital signal function according to claim 2 is characterized in that: described compensated digital signal value settings is 0～9dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205239400U CN202424634U (en) | 2011-12-15 | 2011-12-15 | Automatic gain control circuit with digital signal compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205239400U CN202424634U (en) | 2011-12-15 | 2011-12-15 | Automatic gain control circuit with digital signal compensation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202424634U true CN202424634U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205239400U Expired - Lifetime CN202424634U (en) | 2011-12-15 | 2011-12-15 | Automatic gain control circuit with digital signal compensation function |
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| CN (1) | CN202424634U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545813A (en) * | 2011-12-15 | 2012-07-04 | 江苏亿通高科技股份有限公司 | Automatic gain control circuit with digital signal compensation function |
-
2011
- 2011-12-15 CN CN2011205239400U patent/CN202424634U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545813A (en) * | 2011-12-15 | 2012-07-04 | 江苏亿通高科技股份有限公司 | Automatic gain control circuit with digital signal compensation function |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120905 |