Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1975-05-27
1977-01-04
Segal, Robert
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330 21, 330109, 333 75, H03F 304
Patent
active
040017109
ABSTRACT:
This disclosure relates to an improved fail-safe electronic filter circuit including a common-emitter transistor amplifier having a feedback path. The feedback path includes an R-C twin-T network which is imperfectly nulled to only provide regeneration at a preselected frequency. An emitter-follower circuit operates to isolate the series resistance branch of the R-C twin-T network from the collector of the transistor amplifier so that an output signal is only available during the presence of a signal having the preselected frequency and in the absence of a critical component or circuit failure.
REFERENCES:
patent: 2245365 (1941-06-01), Riddle
patent: 2593600 (1952-04-01), Pike
patent: 3411098 (1968-11-01), Perra
patent: 3725802 (1973-04-01), Darrow
Dahl Lawrence J.
McIntire, Jr. R. W.
Segal Robert
Sotak J. B.
Westinghouse Air Brake Company
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