A photoelectric conversion circuit applied to mouse equipment

Abstract

The invention relates to a field of photoelectric technologies, and specifically relates to a photoelectric conversion circuit applied to mouse equipment. The photoelectric conversion circuit comprises a PD pipe array module, a buffer amplifier module and an ADC (Analog to Digital Converter) module; the photoelectric conversion circuit is characterized in that a row-column gating signal of the PD pipe array module is provided by a peripheral time sequence generation circuit; an output end of the PD pipe array module is connected with an input end of the buffer amplifier module; an output end of the buffer amplifier module is connected with an input end of the ADC module; the output end of the buffer amplifier module is connected with a peripheral DSP (Digital Signal Processor); the peripheral DSP controls the time sequence generation circuit to work. The photoelectric conversion circuit applied to the mouse equipment provided by the invention can be applied to different photoelectric current characteristics and enhances the photoelectric performance of an optical mouse; meanwhile, the varying optical signals can be totally converted into digital signals without omission; besides, two stage conversion is adopted to an ADC circuit, thus the area can be effectively reduced.

Description

technical field [0001] The invention relates to the field of photoelectric technology, in particular to a photoelectric conversion circuit applied to a mouse device. Background technique [0002] Existing photoelectric conversion circuits generally use CMOS image sensing technology to simply perform photoelectric conversion or use parallel conversion ADC modules. However, simply using CMOS image sensing technology for photoelectric conversion does not take into account the linear conversion problem between photoelectric signals, resulting in the inability to effectively convert optical signals into electrical signals in the nonlinear region; and the output electrical signal strength is weak, which requires After amplification and digital-to-analog conversion, it is used in a digital system. Although the parallel conversion ADC module can increase the speed of analog-to-digital conversion, it occupies a large area and costs high. Contents of the invention [0003] The obj...

AI Technical Summary

Problems solved by technology

However, simply using CMOS image sensing technology for photoelectric conversion does not take into account the linear conversion problem between photoelectric signals, resulting in the inability to effectively convert optical signals into electrical signals in the nonlinear region; and the output electrical signal strength is weak, which requires After amplification and digital-to-analog conversion, it is used in a digital system

Although the parallel conversion ADC module can improve the speed of analog-to-digital conversion, it occupies a large area and costs high

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