Integrated injection logic digital-to-analog converter employing

Details Integrated injection logic digital-to-analog converter employing Integrated injection logic digital-to-analog converter employing

1978-01-23

1979-12-11

Morrison, Malcolm A.

Communications: electrical

Audible indication

Percussion-type sound producer

357 92, 307213, 307297, 323 1, H03K 1302

Patent

active

041785843

ABSTRACT:
A digital-to-analog converter circuit suitable for implementation as an integrated circuit in integrated-injection-logic form, and a method for regulating the collector current in a plurality of integrated-injection-logic transistors are disclosed. A plurality of switching transistors are connected to digital input terminals and the currents conducted by the plurality of switching transistors are summed to yield an analog output current. An injection bar shared by each of the switching transistors provides drive current to the plurality of switching transistors. The injection bar is also shared by one or more reference transistors, the current in which is determined by a current source. A feedback circuit is used to regulate the bias of the common injection bar such that the current conducted by each switching device corresponds to the current conducted by each reference device.

REFERENCES:
patent: 3916218 (1975-10-01), Berger et al.
patent: 3978473 (1976-08-01), Pastoriza
patent: 4029974 (1977-06-01), Brokaw
patent: 4061959 (1977-12-01), Ahmed
patent: 4075508 (1978-02-01), Scott
Electronics--Bipolar LSI Takes a New Direction With Integrated Injection Logic, by Hart, Slob and Wulms, Oct. 3, 1974, pp. 111-118.

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