20 kbit optical cable receiving circuit

Published:2011/12/1 20:30:00 Author:May | Keyword: 20 kbit optical cable, receiving | From:SeekIC

This circuit turns theoptical signal transmitted by optical cable to TTL signal level output. Q1 is photistor. When the optical cable receives signal, Q1 is breakover, the current flows into emitter of Q2. After being enlarged by Q2, the current makes Q3 breakove and Q4 close, the circuit outputs high level. When the optical cable can not receive signal, Q1 is closed. There is no current flowing into Q2, and Q3 is closed, Q4 is breakover, and the circuit output is in low level. R1 is used for adjusting the operation point of Q3.



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