Circuit and method for reducing non-linearity in analog output c

Details Circuit and method for reducing non-linearity in analog output c Circuit and method for reducing non-linearity in analog output c

1983-05-04

1985-06-04

Dobeck, B.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

045217653

ABSTRACT:
An integrated circuit digital to analog converter includes circuitry having first and second resistors in a R/2R resistor ladder which scales bit current contributions to an analog output current. Each of the first and second resistors have a respective terminal connected to the collector of a bit current transistor, the emitter of which is connected to the emitter of a waste current transistor. The digital to analog converter includes a metal ground voltage conductor having a "shared node" and a distributed resistance between one side of the shared node and a main ground voltage connection. The collector of the waste current transistor and a second terminal of the first resistor are both connected directly to the shared node. In operation, the waste current transistor switches waste current into the shared node, rather than into a separate waste current ground conductor. This results in substantially less voltage variation across the distributed resistance of the metal ground voltage conductor, and consequently lower non-linearity, than is the case if waste current is switched into the separate ground conductor.

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patent: 3932863 (1976-01-01), Pastoriza
patent: 4250492 (1981-02-01), Yamakido
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patent: 4381499 (1983-04-01), Struthoff
patent: 4414641 (1983-11-01), Jarrett
patent: 4468607 (1984-08-01), Tanaka et al.
patent: 4468652 (1984-08-01), Wang et al.
patent: 4482887 (1984-11-01), Crauwels

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