Digital comparator constructed of IIL

Details Digital comparator constructed of IIL Digital comparator constructed of IIL

1978-08-23

1979-12-25

Malzahn, David H.

Communications: electrical

Digital comparator systems

235 92CA, G06F 704

Patent

active

041807979

ABSTRACT:
In a digital comparator wherein a period of time taken until one output signal of a decoder circuit coincides with one corresponding output signal of a frequency divider circuit is measured by comparing output signals of the decoder circuit and output signals of the frequency divider circuit, an output circuit of the decoder circuit and an output circuit of the frequency divider circuit are constructed of integrated injection logic (IIL) in order to build up wired AND circuits, and further, a NOR circuit which includes inverter circuits constructed of IIL and a common connection line for connecting outputs of the inverter circuits in common is disposed in order to receive respective outputs of the wired AND circuits. Especially, the digital comparator of this invention is effective for an automatic exposure control system of a camera.

REFERENCES:
patent: 3517175 (1970-06-01), Williams
patent: 3622987 (1971-11-01), Borkan
patent: 3676849 (1972-07-01), Malandro et al.
patent: 3836908 (1974-09-01), Hegendorfer
patent: 3878370 (1975-04-01), Santomanyo et al.
patent: 3886571 (1975-05-01), Miyakawa et al.
patent: 4109141 (1978-08-01), Sasaki
Frankeny, "Count Comparison," IBM Tech. Disclosure Bulletin, vol. 13, No. 4, Sep. 1970, p. 980(a).
Lane, "A Monolithic Time Interval Generator," Proceedings of the 1974 IEEE International Symposium on Circuits & Systems, 1974, pp. 386-388.

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