Patent
Fail-safe active bandpass filter using a modified twin-T filter
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TLDR
In this article, a fail-safe active bandpass filter circuit with voltage gain has been proposed, in the sense that shorts and component value changes will not cause the circuit to self-oscillate and thereby produce a spurious signal that would cause unsafe effects.Abstract:
A fail-safe active bandpass filter circuit is disclosed; that is, one having voltage gain and which is arranged to be fail-safe in the sense that opens, shorts and component value changes will not cause the circuit to self-oscillate and thereby produce a spurious signal that would cause unsafe effects.read more
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References
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Patent
Fail-safe electronic band-pass filter
TL;DR: In this paper, a fail-safe electronic filter circuit including a feedback amplifier is described, where the feedback path of the amplifier includes a twin-T network which is imperfectly nulled to only provide regeneration at a preselected frequency so that an output signal is only available during the presence of a signal having the pre-selected frequency and in the absence of critical component or circuit failure.
Patent
Fail-safe active band-pass filter
TL;DR: In this article, an improved fail-safe electronic filter circuit including a common-emitter transistor amplifier having a feedback path is described. The feedback path includes an R-C twin-T network which is imperfectly nulled to only provide regeneration at a preselected frequency.