Digital-to-analog converter

Details Digital-to-analog converter Digital-to-analog converter

1980-09-24

1982-06-22

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

043365272

ABSTRACT:
An R-2R-ladder network has n chained ladder cells, each controlled by an associated one of n control circuits wherein n corresponds to the number of digits of a digital signal to be converted. Each cell is composed of a series transistor inserted between two neighboring nodes of the ladder network and of a first, a second and a third cross transistor. The cross transistors are commonly connected by one main electrode to form a star circuit. The first, second and third cross transistors are connected by a second main electrode to the node of the cell, to a sum current output line and to ground, respectively. The gates of the series transistor and of the first cross transistor are directly connected to a reference voltage source whereas the gates of the second and the third cross transistor of each ladder cell are connected to a respective one of two signal outputs of the associated control circuit. Each control circuit has a signal input for receiving a digit of the digital input signal dependent upon which state the control circuit is operated to shunt the reference voltage alternatively to one of both signal outputs.

REFERENCES:
patent: 2954551 (1960-09-01), Doucette
patent: 3646587 (1972-02-01), Shaffstall
patent: 3755807 (1973-08-01), Brown
patent: 4045793 (1977-08-01), Moench
Pfrenger, "Digest of Technical Papers of 1978 IEEE International Solid-State Circuits Conference", pp. 186-187, 1978.

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