Trans-impedance amplifier

A technology of transimpedance amplifier and amplifier, which is applied in the field of photoelectric communication, can solve the problems of large noise and insufficient signal-to-noise ratio of the system, and achieve the effect of improving performance, satisfying large dynamic range, low noise and low gain

Pending Publication Date: 2022-05-17
西安电子科技大学芜湖研究院
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  • Abstract
  • Description
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Problems solved by technology

[0004] The invention provides a transimpedance amplifier, which is used to solve the problem of insufficient signal-to-noise ratio of the system due to the large noise in the weak signal echo of the existing logarithmic amplifier

Method used

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Embodiment Construction

[0024] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. ...

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Abstract

The invention discloses a trans-impedance amplifier, which comprises an amplifier and a voltage-controlled resistor connected with the amplifier, and the gain control circuit is connected with the voltage-controlled resistor and is used for controlling the voltage at the two ends of the voltage-controlled resistor to be gradually reduced along with time extension, and the amplification gain of the amplifier is gradually increased along with time extension. The device provided by the invention has the characteristics of low gain and wide range in strong echo optical current signal detection of a short-distance target (short echo time), and has the characteristics of high gain and small range in weak echo optical current signal detection of a long-distance target (long echo time); the problem that an existing logarithmic amplifier is large in noise under weak signal echoes, and consequently the signal-to-noise ratio of a system is insufficient can be solved, and the index requirements of a large dynamic range and low noise in a laser radar receiver are met.

Description

technical field [0001] The invention relates to the technical field of photoelectric communication, in particular to a transimpedance amplifier. Background technique [0002] In the laser ranging system, the pulse laser time of flight (Time of Flight, TOF) ranging method is to measure the round-trip time interval between the pulse laser and the laser radar receiver system, and then solve the target and laser radar receiver system. On the other hand, the analog front-end circuit of the receiver mainly includes a pre-transimpedance amplifier and an output drive circuit, etc., wherein the pre-transimpedance amplifier amplifies the photocurrent of the photodetector and converts it into a voltage. The main circuit indicators include gain, Bandwidth, noise, dynamic range, etc., as the key circuit modules of the analog front end, determine the performance indicators such as the detection capability and ranging accuracy of the ranging system. [0003] Since the laser echo energy is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/16H03F3/45H03F1/26H03G3/30
CPCH03F3/16H03F3/45179H03F1/26H03G3/004H03G3/3084H03F2203/45024H03F2203/45031
Inventor 王文强宋子奇田冀楠臧光吴勇王东何滇张野李晴翟世奇查梦凡
Owner 西安电子科技大学芜湖研究院
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