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A device for improving the gain of continuous wave signal low-light detection amplifier circuit

A technology of amplifying circuit and photodetector, which is applied in the directions of amplification control, gain control, electrical components, etc., can solve the problem that the gain bandwidth of the amplifying circuit is difficult to achieve high gain, etc., so as to improve the detection ability, overcome the large noise, and improve the effective gain. Effect

Active Publication Date: 2018-03-16
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the limited gain-bandwidth product of the amplifying circuit is difficult to achieve high gain in the existing continuous wave signal low-light detection technology, and to provide a device for improving the gain of the continuous wave signal low-light detection amplifying circuit

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  • A device for improving the gain of continuous wave signal low-light detection amplifier circuit
  • A device for improving the gain of continuous wave signal low-light detection amplifier circuit
  • A device for improving the gain of continuous wave signal low-light detection amplifier circuit

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Embodiment Construction

[0012] A device for improving the gain of a continuous wave signal micro-optical detection amplifier circuit of the present invention will be introduced below in conjunction with the accompanying drawings and embodiments:

[0013] like figure 1 As shown in the figure, a device for improving the gain of a continuous wave signal low-light detection amplifier circuit includes a photodetector APD, an amplifier AMP, a local oscillator signal source VLO, a bias voltage HV, a current limiting resistor R1, a load resistor R2, and a termination resistor. R3, transimpedance R4, filter capacitor C1, AC coupling capacitor C2 and bypass capacitor C3. Among them, the positive pole of the photodetector APD is respectively connected to one end of the AC coupling capacitor C2 and one end of the load resistor R2, and the negative pole of the photodetector APD is respectively connected to one end of the current limiting resistor R1, one end of the filter capacitor C1, and one end of the transimp...

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Abstract

The invention belongs to the technical field of engineering measurement, and specifically relates to a device for increasing the gain of a continuous wave signal low-light detection amplifying circuit. Gain question. The device includes photodetector APD, amplifier AMP, local oscillator signal source VLO, bias voltage HV, current limiting resistor R1, load resistor R2, termination resistor R3, transresistance R4, filter capacitor C1, AC coupling capacitor C2 and bypass Road capacitor C3. In this scheme, the photodetector APD itself is used as a frequency mixing unit, the local oscillator signal is added to the reference voltage terminal of the photodetector, and the bias voltage of the photodetector is modulated by the local oscillator signal to realize the modulation of the gain of the APD detector.

Description

technical field [0001] The invention belongs to the technical field of engineering measurement, and in particular relates to a device for improving the gain of a continuous wave signal micro-light detection amplifying circuit. Background technique [0002] Low-light detection technology is widely used in laser ranging, lidar, long-distance wireless laser communication, and laser identification of friend or foe. Due to the need to extract the weak signal deeply buried in the shot noise and circuit thermal noise and obtain a certain signal-to-noise ratio to meet the requirements of the subsequent processing circuit, higher requirements are put forward for the noise, gain and process design of the detection amplifier circuit. [0003] In the continuous wave signal low-light detection amplifier circuit, in addition to the limiting factor of the photodetector itself, the main factor limiting the gain of the amplifier circuit is the limited gain-bandwidth product of the amplifier,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20
Inventor 董利军刘柯缪寅宵宋金城郭磊高越
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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