Gain programmable vision buffer amplifier circuit with SAG compensation

A technology of amplifier circuit and programming circuit, which is applied in the direction of gain control, amplification control, TV, etc., can solve the problems of increased capacitor volume and cost, increased circuit volume, increased equipment cost, etc., and achieves simple structure and reduced volume , low cost effect

Inactive Publication Date: 2008-12-24
TIANJIN YAAN TECH CO LTD
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  • Abstract
  • Description
  • Claims
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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 t

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  • Gain programmable vision buffer amplifier circuit with SAG compensation
  • Gain programmable vision buffer amplifier circuit with SAG compensation

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Example Embodiment

[0016] The following examples are used to further illustrate the present invention. The following examples are illustrative and not restrictive, and the scope of protection of the present invention cannot be limited by the following examples.

[0017] The gain programmable video buffer amplifier circuit with SAG compensation includes AC coupling circuit, decoupling circuit, operational amplifier U1, SAG (sag) compensation gain programmable circuit and output circuit. The AC coupling circuit consists of R1, R2, R3 and capacitor C1 is formed and connected to the non-inverting input of operational amplifier U1. The decoupling circuit is composed of inductor L1 and capacitors C2 and C3 and connected to the positive electrode of the operational amplifier. The output of operational amplifier U1 is connected to the BNC interface through output resistor R6. The operational amplifier of the present invention U1 uses a broadband operational amplifier with high input impedance, low input bia...

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Abstract

The invention relates to a programmable gain circuit with SAG compensation for a video frequency buffer amplifier. An operational amplifier U1 of the circuit is connected with the programmable gain circuit with feedback and SAG compensation, wherein, the output end of the operational amplifier U1 is connected with a resistance R4 and a capacitance C4; the resistance R4 is connected with a capacitance C5 of the operational amplifier U1; the capacitance C4 is connected with a resistance R5 and an output resistance R6; the resistance R5 is connected with the capacitance C5 and a resistance R8; and the resistance R8 is connected with an equivalent resistance R7 of the programmable gain circuit. Compared with the circuit of the conventional video frequency buffer amplifier, although a component is added, the volume and the cost are reduced due to the reduced capacity of an output capacitance. The programmable gain circuit has the advantages of simple structure, small volume and cheap circuit, and the circuit device can effectively ensure the transmission quality of video frequency, and the gain can be adjusted according to demands.

Description

technical field [0001] The invention belongs to the technical field of composite baseband video signal processing in the field of video monitoring, 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 that affect signal integrity in many transmission links, such as: impedance mismatching path lengthy, harmful distribution parameters of printed boards, affected by printed board area or cost, etc. The unreasonable selection of some component parameters, etc. will directly or indirectly destroy the transmission quality of the video signal. As a result of signal quality deterioration, bandwidth gain non-uniformity increases, color reproduction information is destroyed, signal / noise ratio deteriorates, signal amplitude attenuation increases, and it is easy to introduce harmonic distortion components, etc., which will greatly reduce the origina...

Claims

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Application Information

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IPC IPC(8): H03G3/20H04N5/52
Inventor 崔广庆
Owner TIANJIN YAAN TECH CO LTD
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