Photoelectric detection control circuit

Abstract

The invention belongs to the technical field of photoelectricity and provides a photoelectric detection control circuit. The photoelectric detection control circuit comprises a photoelectric converter, an operational amplifier and a comparator, wherein the photoelectric converter is used for converting a received optical signal into an electric signal, the operational amplifier is used for amplifying the electric signal, a feedback resistor is connected between the inverted input end of the operational amplifier and the output end of the operational amplifier, the two ends of the photoelectric converter are connected with the normal input end of the operational amplifier and the inverted input end of the operational amplifier, the comparator is connected with the output end of the operational amplifier and is used for comparing electric signals output by the operational amplifier. Preferably, the two ends of the feedback resistor are connected with a compensation capacitor in parallel, and the compensation capacitor is used for phase compensation of the electric signals. Therefore, the photoelectric detection control circuit has the advantages that the stability of a circuit can be improved, a wide bandwidth range is kept, and conversion and comparison between the optical signal and the electric signal can be achieved quickly and accurately.

Description

technical field [0001] The invention relates to the field of photoelectric technology, in particular to a photoelectric detection control circuit. Background technique [0002] The photoelectric conversion circuit is a conversion bridge between basic physical quantities and electronic quantities. In the optical field that will continue to develop in the future, it is an indispensable part of photoelectric conversion. How to improve the conversion efficiency and accuracy is an important index for considering the photoelectric conversion circuit. [0003] Most of the existing conversion circuits adopt such as figure 1 The circuit structure shown is a photoelectric conversion method using a transconductance amplifier. However, due to the inter-electrode distributed capacitance in photodetection, the operational amplifier also has input capacitance, and both the photodetector and the operational amplifier have inter-electrode capacitance distribution, these total capacitance ...

AI Technical Summary

Problems solved by technology

However, due to the inter-electrode distributed capacitance in photodetection, the operational amplifier also has input capacitance, and both the photodetector and the operational amplifier have inter-electrode capacitance distribution, these total capacitance and the feedback resistor R6 will form a hysteresis network, which will cause the output voltage Phase lag, easy to cause self-excited oscillation of the operational amplifier

[0004] In summary, the existing photoelectric detection control circuit obviously has inconvenience and defects in actual use, so it is necessary to improve it

Images