Delta sigma analog-to-digital converter having programmable reso

Details Delta sigma analog-to-digital converter having programmable reso Delta sigma analog-to-digital converter having programmable reso

1996-03-08

1997-11-25

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341155, 341118, 341172, H03M 300

Patent

active

056917201

ABSTRACT:
Programmable resolution/bias current control circuitry is provided in a delta sigma analog-to-digital converter including an input sampling circuit, a feedback reference sampling circuit, an integrator including an operational amplifier, a comparator, and a digital filter, the input sampling circuit and the feedback reference sampling circuit being coupled to a first input of the operational amplifier, an output of the operational amplifier being coupled to an input of the comparator, an output of the comparator being coupled to an input of the digital filter. The programmable resolution/bias control circuitry includes a clock generator circuit supplying a clock signal to the input sampling circuit and the feedback sampling circuit at a sampling frequency determined by a sampling frequency control signal. A bias current generator circuit supplies a bias current to the operational amplifier to control the settling time of an output step voltage signal produced by the operational amplifier. A control circuit receives a resolution control signal and changes both the sampling frequency control signal and a bias control signal in response to the resolution control signal so as to achieve a predetermined tradeoff between resolution of the digital output and dc power dissipation of the analog-to-digital converter.

REFERENCES:
patent: 4935703 (1990-06-01), Poletto
patent: 5045717 (1991-09-01), Moen, Jr. et al.
patent: 5157395 (1992-10-01), Del Signore et al.
patent: 5410310 (1995-04-01), Molnar
patent: 5461381 (1995-10-01), Seaberg
patent: 5610604 (1997-03-01), Leacock et al.

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