Design method for photoelectric detector reading circuit

Abstract

The invention discloses a method for designing a read-out circuit for a photoelectric detector, which is characterized in that the fitting of an electrical characteristic curve of the photoelectric detector is implemented, and functions of which the output current is the voltage and functions of which the capacitance is the voltage can be realized in an equivalent circuit model through one or more voltage-controlled current sources, capacitances and output impedances, so that the equivalent circuit model is established and corrected and improved by circuit simulation software; and finally theequivalent circuit model is taken as an input source of a CTIA type read-out structure, corresponding parameters of the read-out circuit are obtained, and the matching design of the read-out circuit for the photoelectric detector is implemented. Compared with the prior art, the method has the advantages of simple circuit modeling program, clear structure and high precision, provides great convenience for the design of the matched read-out circuit for the photoelectric detector, and has superior performances of small signal deviation and large dynamic range of the read-out circuit.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a design method of a photodetector readout circuit. Background technique [0002] Photodetectors (PDs) are generally made of the photoelectric effect of semiconductor materials and are key devices for optical signal conversion in optical fiber communication and photodetection systems. Photoelectric detectors are widely used in various fields of military and national economy. They are mainly used in ray measurement and detection, industrial automatic control, photometric measurement, etc. in the visible or near-infrared band; in the infrared band, they are mainly used in missile guidance, infrared thermal imaging, Infrared remote sensing, etc. As the detector signal conditioning and output part, the readout circuit (ROIC) plays a vital role in the performance of the detector components. The main function of the readout circuit in the photodetector is to preprocess the weak...

AI Technical Summary

Problems solved by technology

The study found that too many physical characteristic parameters inside the photodetector device and the approximate expressions obtained based on various assumptions when solving a large number of physical characteristic equations will greatly affect the accuracy of the equivalent circuit model. The design of the readout circuit poses difficulties

Moreover, during the solution process, due to the complex structure of the photodetector and various material parameters used, it will also complicate the programming in the modeling process. Therefore, the current modeling method for the equivalent circuit of the photodetector It has certain limitations, and the programming is complicated and the precision is low

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