A Miniaturized Photodetector with Differential Amplification Function

Abstract

The invention discloses a miniature photoelectric detector with a function of differential amplification, and belongs to the field of photoelectric technology and electronic integrated circuit technology. The photoelectric detector mainly consists of a photoelectric detection module and a differential amplification circuit module. The photoelectric detection module is used for collecting an emergent light signal of a to-be-detected laser, and comprises two sets of photodiodes and two sets of protection housings. The differential amplification circuit module is used for the differential amplification of a detection signal, and manly consists of a first-stage amplification circuit, two voltage followers, and a second-stage amplification circuit. The first-stage amplification circuit comprises two parallel amplification branch circuits, and the input is a light current detected by the photoelectric detection module. The two amplification circuits respectively carry out the amplification of two light current signals, and then output the amplified light current signals for subsequent differential amplification. A technical problem to be solved is to provide the miniature photoelectric detector which is high in sensitivity, is high in signal to noise ratio, is small in size, is strong in loading capability and has the function of differential amplification, and the gains of the front and rear amplification circuits can be distributed in a balanced manner.

Description

technical field [0001] The invention relates to the field of optoelectronic technology and electronic integrated circuit technology, in particular to a low-noise, high-carrying-capacity, miniaturized photodetector for detecting laser light and differentially amplifying photocurrent. Background technique [0002] At present, photodetectors have important application value in the field of optoelectronic technology such as laser frequency stabilization, laser phase locking, and laser beat frequency. The photodetector with differential amplification function can convert the weak optical power signal into a current signal according to the power of the target laser and complete the differential amplification process, laying the foundation for laser signal processing. [0003] The miniaturized photodetector with differential amplification combines optoelectronic technology and electronic circuit technology. It is mainly composed of a photodiode, an amplifier circuit, a voltage fol...

AI Technical Summary

Problems solved by technology

The traditional differential amplifier circuit is often due to the large impedance of the photodiode, resulting in insufficient load capacity of the photodetector.

In addition, in actual use, there are also restrictions on the size of photodetectors

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