Photoelectric receiving and detecting circuit

Abstract

The invention discloses a photoelectric receiving and detecting circuit. The circuit comprises a photoelectric receiving sub-circuit, a noise collecting sub-circuit and a signal amplifying sub-circuit; the photoelectric receiving sub-circuit receives a first optical signal and a second optical signal in a time-sharing manner, converts the received first optical signal into a first electric signal, and converts the received second optical signal into a second electric signal; the noise collecting sub-circuit receives the first electric signal of the photoelectric receiving sub-circuit and generates a common-mode voltage containing an optical noise signal; and the signal amplifying sub-circuit receives the common-mode voltage generated by the noise acquisition sub-circuit and the second electric signal generated by the photoelectric receiving sub-circuit, filters the first electric signal to generate a third electric signal, and outputs the amplified third electric signal. The photoelectric receiving and detecting circuit is simple in structure, easy to implement, low in cost and capable of automatically filtering optical noise signals, and improves photoelectric detection precision and detection efficiency.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a photoelectric receiving and detecting circuit. Background technique [0002] Photoelectric detection technology is an important part of photoelectric information science and engineering technology. In recent years, with the rapid development of integrated circuits, photoelectric detection technology has also been developing and improving, and it is becoming more and more highly integrated. It is widely used in military, Medical, industrial and other fields, so it constantly promotes the development of optoelectronic information science and engineering technology. The photoelectric detection circuit is generally composed of a photoelectric transmitter, a photoelectric receiver, and a detection circuit; the main function of the photoelectric transmitter is to aim at the target and emit light beams. The emitted light beams generally come from semiconductor light sources, such as...

AI Technical Summary

Problems solved by technology

The traditional photoelectric receiving and detecting circuit has the following disadvantages: first, the circuit cost is high, and two photodiodes and their respective receiving and detecting circuits are required; An additional calibration circuit is required to avoid measurement errors caused by offsets and process deviations from affecting system detection results

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