Optical receiver, optical audio apparatus, optical communication apparatus and optical reception method

摘要

An optical receiver with a threshold voltage convergence and audio apparatus and communication apparatus using the optical receiver are provided. The optical receiver of the present invention includes an optical detector for converting a received optical signal to a current signal; a transimpedance amplifier for converting the current signal to a voltage signal; a level shifter for converging the voltage signal to a threshold voltage by removing an offset of the voltage signal, the level shifter comprising a plurality of linear subtractors connected in series; a reference voltage generator for generating a reference voltage in proportion to a variation of the offset of the voltage signal; and a comparator for comparing the threshold voltage and the reference voltage and generating a digital signal of a logic level according to a comparison result. The optical receiver of the present invention can compensate the shortcomings of the automatic voltage gain control and automatic threshold control techniques and reduce system complexity, thereby minimizing pulse-width distortion with a compact and low power consumption design and reducing the manufacturing costs of high performance digital interfaces.