Transimpedance amplifier unit circuit feedback circuit, photoelectric detection circuit and laser radar system
A technology of transimpedance amplification and feedback circuit, applied in the field of circuits, can solve the problems of limited current capacity of diodes, reduced threshold voltage, large parasitic capacitance, etc.
Active Publication Date: 2020-11-13
HESAI TECH CO LTD
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[0005] However, for the scheme using diode clamping, due to the limited current capacity of diodes, multi-level clamping is required in practice, so that the threshold voltage decreases sequentially, the circuit is more complicated, and the parasitic capacitance is relatively large
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[0031] In the following, only some exemplary embodiments are briefly described. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present disclosure. Accordingly, the drawings and descriptions are to be regarded as illustrative in nature and not restrictive.
[0032] Reference will now be made in detail to several embodiments of the invention, examples of which are illustrated in the accompanying drawings. It should be noted that wherever possible, similar or identical reference numerals may be used in the drawings, and they may be used to indicate similar or identical functions. The drawings depict several embodiments of the invention for purposes of illustration only. Those skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods described herein may be used without departing from the ...
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The invention relates to a trans-impedance amplification unit circuit feedback circuit, which comprises a current mirror, a first switch, a second switch and a reference current source, and is characterized in that the output end of the current mirror is coupled to the input end of the tran-simpedance amplification unit through the second switch; the input end of the current mirror is connected with the first switch in parallel and is connected to the reference current source; the control end of the first switch is coupled to the output end of the trans-impedance amplification unit, and the control end of the second switch is coupled to the output end of the transimpedance amplification unit. By adopting the embodiment of the invention, the recovery circuit of the transimpedance amplification unit (TIA) from the saturated state is simpler and more efficient with a simple structure, and meanwhile, excessive parasitic and static power consumption is not increased.
Description
technical field [0001] The present disclosure generally relates to the technical field of circuits, and specifically relates to a transimpedance amplifying unit circuit, especially a feedback circuit for a transimpedance amplifying unit circuit, a photoelectric detection circuit, a laser radar system, and a laser detection method. Background technique [0002] A trans-impedance amplifier unit (TIA, trans-impedance amplifier) circuit is often used to amplify and convert weak signals to facilitate further signal and data processing. For example, it is commonly used in lidar and forms part of the front-end receiver of lidar. The front-end receiver of the lidar usually includes an optical receiver and a transimpedance amplifier unit circuit. The light receiver is, for example, a photodiode (PD) or an avalanche photodiode (APD, Avalanche Photo Diode). Taking a photodiode as an example, it is usually a p-n junction or PIN structure. When the photosensitive surface of the photo...
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IPC IPC(8): H03F3/08H03F3/45G01S7/4861G01S7/487G01S17/93G01S17/10
CPCG01S7/4861G01S7/4873G01S17/10G01S17/93H03F3/082H03F3/45179H03F2203/45031
Inventor 高飞向少卿
Owner HESAI TECH CO LTD