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Gain programmable video buffer amplifier circuit with sag compensation

An amplifier circuit and programming circuit technology, applied in gain control, amplification control, television and other directions, can solve the problems of increasing equipment cost, circuit volume, capacitance volume and cost, etc., and achieves reduced volume and simple structure. , the effect of good bandwidth response

Inactive Publication Date: 2011-12-28
TIANJIN YAAN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For capacitors, 100μF is a balance point between physical size and cost. After the capacity is larger, the volume and cost of the capacitor will increase sharply, which will not only increase the circuit size, but also increase the cost of the equipment.

Method used

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  • Gain programmable video buffer amplifier circuit with sag compensation
  • Gain programmable video buffer amplifier circuit with sag compensation
  • Gain programmable video buffer amplifier circuit with sag compensation

Examples

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Embodiment Construction

[0013] The present invention will be further described below with reference to the examples. The following examples are illustrative, not restrictive, and the protection scope of the present invention cannot be limited by the following examples.

[0014] The gain programmable video buffer amplifier circuit with SAG compensation includes an AC coupling circuit, a decoupling circuit, an operational amplifier U1, a SAG (sag) compensation gain programmable circuit and an output circuit, wherein the AC coupling circuit consists of R1, R2, R3 and capacitors. C1 constitutes and is connected to the non-inverting input terminal of the operational amplifier U1, the decoupling circuit is composed of the inductor L1 and the capacitors C2 and C3 and is connected to the positive pole of the operational amplifier, and the output terminal of the operational amplifier U1 is connected to the BNC interface through the output resistor R6. In the present invention, the operational amplifier U1 uses...

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PUM

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Abstract

The present invention relates to a programmable gain video buffer amplifier circuit with SAG compensation. The operational amplifier U1 of the circuit is connected to a programmable gain circuit with feedback and SAG compensation, wherein the output terminal of the operational amplifier U1 is connected to a resistor R4 and a capacitor C4. The resistor R4 is connected to the capacitor C5 of the operational amplifier U1, the capacitor C4 is connected to the resistor R5 and the output resistor R6, the resistor R5 is connected to the capacitor C5 and the resistor R8, and the resistor R8 is connected to the equivalent resistor R7 of the gain programmable circuit. Compared with the conventional video buffer amplifier circuit, although the present invention has increased components and parts, the volume and cost of the output capacitor are reduced due to the capacity reduction, the overall circuit has the advantages of simple structure, small volume and low cost, and the circuit device It can effectively guarantee the quality of video transmission, and the gain can be adjusted as needed.

Description

technical field [0001] The invention belongs to the technical field of composite baseband video signal processing in the field of video surveillance, in particular to a gain programmable video buffer amplifier circuit with SAG compensation. Background technique [0002] Video signals in the form of analog baseband signals have many factors affecting signal integrity in many transmission links, such as: impedance mismatch paths are redundant, harmful distribution parameters of printed boards, affected by printed board area or cost, etc. The unreasonable selection of some component parameters will directly or indirectly destroy the transmission quality of the video signal. As a result of the deterioration of the signal quality, the unevenness of the bandwidth gain is increased, the color reproduction information is destroyed, the signal / noise ratio is deteriorated, the attenuation of the signal amplitude is increased, and the harmonic distortion component is easily introduced,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20H04N5/52
Inventor 崔广庆
Owner TIANJIN YAAN TECH CO LTD
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