Digital to analogue and analogue to digital converters

Details Digital to analogue and analogue to digital converters Digital to analogue and analogue to digital converters

1998-05-21

2000-08-15

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

H03M 180

Patent

active

061043303

ABSTRACT:
A digital to anologue converter comprises a plurality of current sources (T.sub.o -T.sub.n) and corresponding selection switches (D.sub.o -D.sub.n) which connect the current sources to an output (3). In order to enable a constant capacitance to be presented at the output (3) regardless of the input digital code a plurality of dummy current sources (T.sub.o -T.sub.n) which take the same form as the current sources (To-T.sub.n) are provided. The dummy current sources have associated selection switches ( D.sub.o -D.sub.n) which are operated by the logical inverse of the code applied to the current sources (T.sub.o -T.sub.n).

REFERENCES:
patent: 4947169 (1990-08-01), Smith et al.
patent: 5400273 (1995-03-01), Hughes et al.
patent: 5463394 (1995-10-01), Sun

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