Programmable integrated circuit AC resistor network

Details Programmable integrated circuit AC resistor network Programmable integrated circuit AC resistor network

1983-01-21

1985-11-05

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

357 231, H03K 1302

Patent

active

045517053

ABSTRACT:
A monolithic integrated circuit D-to-A converter and programmable AC resistor network and current source is disclosed in which an array of FET cells formed on a semiconductor body is divided into a plurality of distinct sets which may be grouped in two groups of corresponding sets. The source and drain regions respectively of all of the cells in each group are connected in common. The gate regions of the cells in each distinct set are also connected. In embodiments comprising two groups of cells, gate control logic is included which may supply signals of opposite binary states respectively to the gate regions of corresponding sets of cells in the two groups.

REFERENCES:
patent: 3646587 (1972-02-01), Shaffstall et al.
patent: 3995304 (1976-11-01), Pease
patent: 4045793 (1977-08-01), Moench
patent: 4152714 (1979-05-01), Hendrickson
patent: 4311988 (1982-01-01), Kelley et al.

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