PURPOSE: To simplify the adjustment operation of a timing clock extraction circuit of an optical receiver by adopting a constitution such that a constant current source is connected to emitters of two opposite transistors(TRs), the emitters are coupled by a capacitor, signals of opposite phase are inputted to two bases and an output signal is obtained from the collector.
CONSTITUTION: When signals of opposite phase to each other are inputted to bases of two TRs 120, 130, the emitter potentials are apt to be changed similarly. However, since a capacitor 140 is connected, the charging/discharge time of the capacitor 140 is required to cause a voltage change. Then the discharge time (t) of the capacitor 140 is expressed as t=C×2V/I, where l is a current flowing to a constant current source 150, C is a capacitance of the capacitor 140 and V is a voltage between Hi and Lo levels of the input signal. As a result, the time (t) is set to a prescribed value and the adjustment of timing clock extraction is facilitated by adjusting the current I.
| JP3552204 | Data transmission equipment and transmission system |
| JPH0290748 | TIMING EXTRACTION CIRCUIT |
YAMAMOTO TAKUJI
AMAMIYA IZUMI
ARAI YASUNARI
IHARA TAKESHI
