| 摘要 |
PROBLEM TO BE SOLVED: To provide an identification level automatic control circuit and method, an identification phase automatic control circuit and method, and an optical receiver that can stably set an optimum identification level or an optimum identification phase. SOLUTION: The automatic identification level control circuit of this invention includes a coupling capacitor 100, a tri-state value identification circuit 101, a level fluctuation detection circuit 102, an identification voltage control circuit 103, and a low pass filter 104. The tri-state value identification circuit 101 consists of limiter amplifiers 105-107 and flip-flop circuits 108-110. Furthermore, the level fluctuation detection circuit 102 consists of exclusive OR circuits 111, 112. |
