| 摘要 |
<P>PROBLEM TO BE SOLVED: To widen a dynamic range, while keeping the extinction ratio constant with respect to variations in the input amplitude. <P>SOLUTION: An optical receiver 10 for burst signal is provided with an amplifier 12 for converting a signal current Ii outputted from a light-receiving element 11 into a signal voltage Vo, a transistor 13 for adjusting the gain of the amplifier 12, a current-detecting circuit 20 for detecting the peak value of the current Ii, a dummy current generating circuit 30 for generating a DC current Ip which is identical to the peak value and outputting a DC current Vp identical to a signal voltage Vo, obtained when converting the current Ip by the amplifier 12, an amplitude control circuit 40 for outputting a control voltage Vc1 corresponding to the difference between the current Vp and a reference voltage Vr to control a resistant value of a transistor 13 so that the amplitude of the current Vo converted by the amplifier 12 remains fixed. <P>COPYRIGHT: (C)2003,JPO |
