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Multichannel radar video receiving machine based on operational amplifier

An operational amplifier and receiver technology, used in television, color TV, image communication, etc., can solve the problems of low frequency, can not completely suppress DC, achieve small in-band fluctuations, avoid self-excitation phenomenon, and increase dynamic range Effect

Inactive Publication Date: 2014-01-08
CNGC INST NO 206 OF CHINA ARMS IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in summary, current video receivers cannot completely suppress DC, and cannot be applied to very low frequencies on the basis of UWB

Method used

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  • Multichannel radar video receiving machine based on operational amplifier
  • Multichannel radar video receiving machine based on operational amplifier
  • Multichannel radar video receiving machine based on operational amplifier

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Embodiment Construction

[0017] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0018] figure 2 Preferred embodiments of the invention are provided. Such as figure 2 As shown, the working process of the three-channel receiver is the same, and the working process of one channel is described. It can be seen from the block diagram of the receiver that after the echo signal after self-mixing enters the video receiver, it first passes through the ADT1-1 transmission line transformer of MiNi Company for DC blocking processing. Due to the physical isolation of the input and output ports of the transformer itself, the echo signal entering the video The DC signal of the receiver cannot enter the post-stage circuit through the transmission line transformer, while the video signal can reach the post-stage circuit through electromagnetic coupling. image 3 The simulation results of the DC blocking circuit based on ADT1-1 are given. The video signa...

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Abstract

The invention relates to a multichannel radar video receiving machine based on an operational amplifier. The multichannel radar video receiving machine based on the operational amplifier is characterized in that the input ends of the receiving machine are blocking circuits, the blocking circuits are connected with numerical control attenuators, the output ends of the numerical control attenuators are connected with first-stage negative feedback amplifier circuits, the output ends of the first-stage negative feedback amplifier circuits are connected with filter circuits, and the output ends of the filter circuits are sequentially connected with second-stage negative feedback amplifier circuits and third-stage negative feedback amplifier circuits through 50omega resistors. The multichannel radar video receiving machine based on the operational amplifier solves the inherent problems existing in a self-mixing system receiving machine, and also meets the requirements for miniaturization, the high integration level, the low cost, low noise, the ultra wide band and the like. On the premise that the low noise requirement is met, the negative feedback amplifier circuits formed based on the operational amplifier can conveniently adjust the gain of the amplifier circuits, and therefore gain distribution can be readjusted until the designed video receiving machine meets the system requirements when the video receiving machine is debugged.

Description

technical field [0001] The invention relates to a radar multi-channel video receiver based on an operational amplifier, specifically through rationally designing a negative feedback amplifier circuit, a filter circuit, a numerical control attenuation circuit, a DC blocking circuit and a matching circuit between them in the video receiver Meet the system's gain, noise level, dynamic range, amplitude and phase consistency and other index requirements. Background technique [0002] The receiver is located at the forefront of the wireless communication system, and its structure and performance directly affect the entire communication system. Since the self-mixing system receiver has the characteristics of small size, low cost and easy monolithic integration, it has become a very competitive structure in the receiver. It takes the local oscillator frequency as the signal frequency received by the antenna, and directly converts the received signal into a video signal for video si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/44H03H7/09
Inventor 梁文博潘丽娟周立学李宏徐文莉
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP
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