Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1974-09-13
1976-03-30
Olms, Douglas W.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330 85, H04H 500
Patent
active
039476456
ABSTRACT:
A balanced demultiplexer for an FM stereophonic receiver includes a differentially connected switching circuit, a differentially connected crosstalk cancellation circuit and a differential amplifier circuit which is connected as a constant current source to the switching and cancellation circuits. The switching signal is applied to both the switching and cancellation circuits but in reverse phase. An input composite signal is applied to the differential amplifier which causes crosstalk components to appear in reverse phase at the outputs of the switching and cancellation circuits. In order to eliminate distortion due to nonlinearities of the input transistor in the differential amplifier, an operational amplifier is connected between the emitter and base circuits of the transistor to provide negative feedback.
REFERENCES:
patent: 3089098 (1963-05-01), Noe
patent: 3204192 (1965-08-01), Barditch et al.
patent: 3516002 (1970-06-01), Hillis
patent: 3573382 (1971-04-01), Feit et al.
patent: 3667055 (1972-05-01), Uchida
patent: 3737798 (1973-06-01), Paraguet et al.
patent: 3842211 (1974-10-01), Metro
"Electronic Circuits" by Angeleo pp. 603-605 published by McGraw-Hill, Inc. 1958.
Mizukami Takashi
Mouri Takuo
Olms Douglas W.
Pioneer Electronic Corporation
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