H - Electricity – 03 – H
Patent
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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