Analog-digital converter using current controlled voltage refere

Details Analog-digital converter using current controlled voltage refere Analog-digital converter using current controlled voltage refere

1994-10-19

1997-01-07

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341136, H03M 136

Patent

active

055921671

ABSTRACT:
A current driven span voltage source for use in an analog to digital converter includes a zero reference resistor serially connected with a resistor ladder. A first current source selectively passes a part of a first current through the resistor ladder to establish a span (gain) voltage range, and a second current source selectively passes a part of a second current through the zero reference resistor to establish a zero reference voltage for the span voltage range. The controlled current sources increase speed, reduce power and thermal noise, and improve temperature related performance as compared with voltage driven span and reference sources using operational amplifiers.

REFERENCES:
patent: Re34295 (1993-06-01), Shibuya et al.
patent: 4250493 (1981-02-01), Kihara et al.
patent: 4549165 (1985-10-01), Brian
patent: 5111205 (1992-05-01), Morlon
patent: 5283579 (1994-02-01), Tasdighi et al.
patent: 5294927 (1994-03-01), Levinson et al.

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