H - Electricity – 03 – F
Patent
H - Electricity
03
F
350/109, 330/22,
H03F 3/45 (2006.01)
Patent
CA 1310376
RCA 83,957A CURRENT GAIN COMPENSATION AMPLIFIER ABSTRACT A first pair of transistors, Q721 and Q723, operating, each, as an emitter follower, has a relatively low emitter current. The emitter followers drive corresponding base electrodes of transistors of a second pair of transistors, Q148 and Q149, coupled as a differential amplifier. A current gain compensating transistor Q726 has a current gain that tracks current gain variations of each of the transistors of the second pair. A base electrode current of the compensating transistor and a second current iQ727 that is unaffected by current gain variations are summed. The summed current is coupled via transistors Q722 and Q724 of a current mirror arrangement to first and second junction terminals, respectively coupled between the respective emitter electrodes of the emitter followers and the base electrodes of the second pair. Currents generated by the current mirror arrangement compensate for variations in the base currents in the transistors of the second pair so as to maintain the emitter currents in the emitter followers substantially unaffected by these variations.
615940
Craft Jack
Low Michael Louie
Yorkanis Bernard Joseph
Craig Wilson And Company
Rca Licensing Corporation
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