| 摘要 |
PURPOSE: A light-receiving circuit is provided to reduce manufacturing costs by offering high photo sensitivity without using an overhead external mounting resistance device. CONSTITUTION: A light-receiving circuit comprises a photo diode(101), an NMOS(N-channel Metal Oxide Semiconductor) transistor(102), a control circuit(103), an output terminal(104), level shift circuit(108), and a CMOS level signal output terminal(111). An N-type terminal of the photo diode is connected to a VDD terminal. A P-type terminal of the photo diode is connected to a drain of the NMOS transistor and an input terminal(105) of the control circuit. A control state signal output terminal(106) is connected to an input terminal(109) of the level shift circuit and the output terminal. A control terminal(107) is connected to a gate of the NMOS transistor. An output terminal(110) of the level shift circuit is connected to a CMOS(C-channel Metal Oxide Semiconductor) level signal output terminal.
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