Input circuits

Details Input circuits Input circuits

1978-08-09

1980-09-16

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340171PF, H04Q 300

Patent

active

042232996

ABSTRACT:
An input circuit for use in the selection of one of n .times. m inputs signified by the closure of one of n .times. x m switch units. Each switch unit is a single pole switch connected between one of a first set of n terminals to which a first potential is applied and one of a second set of m terminals to which a second, different potential is applied. A circuit is provided for detecting the flow of current upon closure of a switch and for applying a potential to one of a third set of n terminals and one of a fourth set of m terminals dependent on the switch closed. Said circuit may comprise CMOS devices, allowing the input circuit to exhibit substantially zero quiescent power consumption.

REFERENCES:
patent: 3424870 (1969-01-01), Breeden
patent: 3521005 (1970-07-01), Dow et al.
patent: 3612773 (1971-10-01), Riehm
patent: 3790813 (1974-02-01), Ennis
patent: 4101871 (1978-07-01), Oliveira

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