Adaptive threshold control circuit

Details Adaptive threshold control circuit Adaptive threshold control circuit

1989-03-30

1991-02-12

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307359, 307547, 307549, H03K 508, H03K 5153

Patent

active

049926756

ABSTRACT:
This circuit provides output detection pulses in response to interrogation signals for transponder systems which require a high degree of sensitivity and a low degree of false alarms. This circuit includes a tracking arrangement which monitors the level of noise and adjusts a control signal to exclude noise below a certain threshold. A comparator generates detection pulses in response to the input interrogation signals and the control signal. As a result, detection pulses are produced only for interrogation signals on a one-for-one basis. At the same time, the circuit adjusts its sensitivity so that low power interrogation signals (sufficiently above the noise level) may be accurately detected without responding excessively to noise. In addition, an active clamp circuit increases the gain and sensitivity of the circuit by clamping the noise level to approximately a ground state. The circuit is totally insensitive to the interrogation pulse amplitude and relatively insensitive to the interrogation pulse rate.

REFERENCES:
patent: 3348065 (1967-10-01), Schmidt
patent: 3387222 (1968-06-01), Hellwarth et al.
patent: 3737790 (1973-06-01), Brown
patent: 3999083 (1976-12-01), Bumgardner
patent: 4367441 (1983-01-01), Niyada et al.
patent: 4426591 (1984-01-01), Cargille
patent: 4786903 (1988-11-01), Grindahl et al.

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