发明名称 |
LICHTEMPFÄNGERKREIS |
摘要 |
A circuit for receiving light incorporates an amplifier (12) having a differential output and is so designed that the positive-phase and antiphase output (Vp, - Vp) from the amplifier (12) are inputted to a comparator (34) always at optimum threshold levels respectively. For this purpose, the peak voltage (Vi) of the positive-phase and antiphase outputs from the amplifier (12) is sensed by a peak value sensor (26) and the peak voltage (Vi) is converted into a current by a voltage-to-current converter (28) having a transconductance (gm). The converter (28) has a differential output and outputs a positive-phase output (I+ = gm Vi) and an antiphase output (I- = gm Vi) respectively. These currents (I+, I-) are converted into voltages by resistors (R10, R12) and the resultant voltages are substracted from the positive-phase and antiphase output (Vp, - Vp). Thereby, the outputs (Vp, - Vp) are mutually level-shifted by the same voltage value respectively. The signals thus level-shifted are inputted to the positive-phase and antiphase inputs of the comparator (34) respectively. <IMAGE> |
申请公布号 |
DE69117150(T2) |
申请公布日期 |
1996.07.25 |
申请号 |
DE1991617150T |
申请日期 |
1991.07.01 |
申请人 |
KABUSHIKI KAISHA TOSHIBA, KAWASAKI, KANAGAWA, JP |
发明人 |
SAKURA, SHIGEYUKI, KAWASAKI-SHI, KANAGAWA-KEN 214, JP |
分类号 |
H03K5/08;H03F1/02;H03F3/08;H04B10/07;H04B10/2507;H04B10/293;H04B10/564;H04B10/572;H04L25/02;H04L25/03;H04L25/06 |
主分类号 |
H03K5/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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