Fail-safe active band-pass filter

Details Fail-safe active band-pass filter Fail-safe active band-pass filter

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

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