H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 3/45 (2006.01) H03F 3/08 (2006.01)
Patent
CA 2108019
A wideband transim- pedance amplifier utilizing a differential amplifier cir- cuit structure whereby the differential pair is bridged by a signal detector (50 which, as an example, would be a photodetector when the transimpedance amplifier is employed with- in an optical receiver. In or- der to bias the signal detec- tor the differential pair is operated asymmetric with respect to the DC voltage but the circuit maintains a symmetric AC response to the signal detector current input. The circuit is de- signed to operate at the un- ity gain frequency. The sig- nal detector is placed be- tween the source (or emitter) electrodes (32) of the tran- sistors (30) which helps to reduce the impact of gate (or base) capacitance on circuit response speed. These factors combined maximize the bandwidth capa- bilities of circuit. The circuit is responsive to a current input to produce two voltage outputs (15a and 15b) equal in magnitude but opposite in phase.
Chang Gee-Kung
Gimlett James Lawrence
Liu Ting-Ping
Bell Communications Research Inc.
Kirby Eades Gale Baker
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