Pre-amplifier circuit for photoelectric detector

Abstract

The invention provides a pre-amplifier circuit for a photoelectric detector, comprising a high voltage generation circuit and a pre-amplifier, wherein a negative high voltage generation circuit supplies high voltage to the pre-amplifier, thereby driving an avalanche photodiode to work. An MOS transistor drive chip generates a switching signal based on an access 10KHZ square wave, thereby controlling on-off of a switch MOS transistor chip; a first inductor is charged by a power supply voltage at the moment when the switch MOS transistor chip is switched on; the power is stored in a third capacitor, a forth capacitor and a fifth capacitor through a first diode circuit; after the switch MOS transistor chip is switched off, a first diode is reversely cut off, so an output capacitor discharges power to a load; and a third resistor, a fourth resistor, the third capacitor and the fourth capacitor form a second-order RC filter circuit. The pre-amplifier is small in size and stable in performance.

Description

technical field [0001] The invention belongs to the technical field of sensor receiving circuits, and in particular relates to a preamplifying circuit of a photodetector. Background technique [0002] In the receiving circuit of the sensor, the photodetector can measure the light signal, and it is widely used in laser ranging, medicine, navigation and so on. Generally, the signal received by the sensor is very weak. In order to amplify the weak signal to a level that can be detected, a preamplifier circuit is required. Usually, the improper use of passive components is likely to cause the instability of the entire amplifying circuit, the noise is large and the detected signals are superimposed, and accurate measurement data cannot be obtained. [0003] The photodetection devices commonly used in traditional preamplification circuits include photomultiplier tubes, PIN photodiodes, and avalanche photodiodes. Among them, the photomultiplier tube has the disadvantages of large...

AI Technical Summary

Problems solved by technology

PIN photodiodes are generally used in occasions where there are strict requirements on the size of the receiving module, the echo power is large, and the requirements for photoelectric receiving sensitivity and response time are not high. Therefore, the traditional operational amplifier circuit uses an operational amplifier, which is larger and more costly.

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