Differential threshold detector

Details Differential threshold detector Differential threshold detector

1978-01-12

1979-07-03

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307351, 328151, 328147, 328135, H03K 5153

Patent

active

041601750

ABSTRACT:
An adaptive reference threshold detector for sensing a drop of predetermined magnitude in the level of an input signal from its peak value during an interval of time. A capacitor, diode coupled to the output of a voltage follower, is charged to a level coincident with the maximum input signal voltage during the time interval of interest. The voltage stored thereon is coupled through a negative feedback arrangement and resistive divider network to one port of a voltage comparator. The input signal itself serves as the second input to this voltage comparator circuit. A logic level signal is generated by this comparator when the difference between its two input port signals exceeds a predetermined value.

REFERENCES:
patent: 3654444 (1972-04-01), Gurol
patent: 3714464 (1973-01-01), Nutt
patent: 3797894 (1974-03-01), Carp
patent: 3804979 (1974-04-01), Knowles
D. E. Fiehmann et al., "Data Demodulator Circuit Arrangement" IBM Technical isclosure Bulletin, vol. 20, No. 2, July, 1977, p. 769.

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