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Automatic gain control circuit with digital signal compensation function

An automatic gain control and digital signal technology, applied in gain control, amplification control, electrical components, etc., can solve problems such as control errors, achieve signal stability, and ensure stable output effects

Inactive Publication Date: 2012-07-04
JIANGSU YITONG HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an automatic gain control circuit with digital signal compensation function to solve the control error caused by the detection difference value of the analog / digital signal in the existing conventional control circuit

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  • Automatic gain control circuit with digital signal compensation function
  • Automatic gain control circuit with digital signal compensation function

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Embodiment Construction

[0017] As shown in the figure, the automatic gain control circuit with digital signal compensation function includes:

[0018] The controllable attenuation module is used to variably attenuate the radio frequency input signal in response to the control signal, and the controllable attenuation module of the present invention is one or more;

[0019] The radio frequency branch and detection circuit are used to detect the radio frequency output signal attenuated by the above-mentioned controllable attenuation module and amplified by the radio frequency amplification module, and output an analog voltage value corresponding to the signal;

[0020] The AD converter is used to convert the detected analog voltage value into the digital signal value required by the control algorithm module;

[0021] The control algorithm module is used to receive the digital signal value output by the AD converter, judge the current radio frequency signal level, and add a digital signal compensation al...

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Abstract

The invention discloses an automatic gain control circuit with a digital signal compensation function, which comprises one or more than one controllable attenuation module, 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. The automatic gain control circuit conducts sampling on radio frequency output signals through the radio frequency branch and detection circuit and delivers the signals into the control algorithm module after AD conversion. After a digital signal compensation value is added into control algorithm, obtained control output is calculated, a controllable attenuator is controlled after DA conversion, and accordingly automatic gain control with a digital signal compensation function can be achieved. Automatic gain control errors caused by detection difference values of analog / digital signals can be avoided.

Description

technical field [0001] The invention discloses an automatic gain control circuit with digital signal compensation function used in a radio frequency amplifier circuit. Background technique [0002] my country's cable TV network adopts the PAL-D / K mode, and the bandwidth of each channel is 8MHZ. Conventionally, 45-550MHZ transmits analog signals, and 550-860MHZ transmits digital signals. With the continuous promotion of digital TV at present, each cable TV station only retains 6 to 8 analog signals, and the rest are all digital signals. In actual transmission, the level of the digital signal is generally 6-10dB lower than that of the analog signal. [0003] At present, the general automatic gain control (AGC) circuit detects the signal level by detecting the signal to realize AGC control, and cannot distinguish the level difference between the analog signal and the digital signal in transmission. When the mixed transmission of analog signal and digital signal, or all digita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/28
Inventor 王振洪马晓东陈小星李俊徐燎原李澄江
Owner JIANGSU YITONG HIGH TECH
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