DAC with feedback control for current source bias during non-dis

Details DAC with feedback control for current source bias during non-dis DAC with feedback control for current source bias during non-dis

1996-04-01

1997-12-30

Williams, Howard L.

Coded data generation or conversion

Converter calibration or testing

341136, 341153, H03M 110, H03M 170

Patent

active

057035822

ABSTRACT:
A D/A converter of a current output type desirably compensates for changes in the switching characteristic that arise in each constant current circuit. The D/A converter generates an analog output current that is in response to the level of input digital data and outputs it from an output side by switching each of output currents of a plurality of constant current circuits either to the output side or to a non-output side, in response to the input digital data. The D/A converter performs feedback control, for values of the output currents for the constant current circuits, based on an analog output current at the non-output side during a period when the output currents of all of the constant current circuits are connected to the non-output sides.

REFERENCES:
patent: 4631518 (1986-12-01), Caspell
patent: 4641194 (1987-02-01), Hinn
patent: 4958155 (1990-09-01), Gulczynski
patent: 5021784 (1991-06-01), Groeneveld et al.
patent: 5570090 (1996-10-01), Cummins
Boiocchi et al., Self-calibration in high speed current steering CMOS D/A converters, Second International Conference on Advanced A-D and D-A Conversion Techniques and Applications, Cambridge, UK; Jul. 1994, IEE Publ. No. 393, pp. 148-152.

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