Fall-safe active band-pass filter

Details Fall-safe active band-pass filter Fall-safe active band-pass filter

H - Electricity

03

H

333/56

H03H 7/01 (2006.01) H03H 11/04 (2006.01)

Patent

CA 1043433

AN IMPROVED FAIL-SAFE ACTIVE BAND-PASS FILTER ABSTRACT OF THE DISCLOSURE This disclosure relates to an improved fail-safe elec- tronic 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 pro- vide regeneration at a preselected frequency. An emitter-fol- lower 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.

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