Coded data generation or conversion – Converter calibration or testing
Patent
1998-10-29
2000-10-17
Williams, Howard L.
Coded data generation or conversion
Converter calibration or testing
341154, 341158, H03M 110
Patent
active
06133863&
ABSTRACT:
A multiple reference voltages generation apparatus, which generates multiple reference voltages to an analog-to-digital converter (ADC), is provided. The apparatus includes a resistor-string and a control device. The resistor-string has a first terminal and a second terminal for connecting respectively with a first reference voltage and a second reference voltage. The resistor-string comprises a plurality of series-connected resistors which define a plurality of nodes for outputting the multiple reference voltages. A plurality of Bit-Decision-Node {n<2.sup.k .times.j>, where k=0, . . . (m-1), j is an odd positive integer and (2.sup.k .times.j) is smaller than 2.sup.m } determine accuracy of a corresponding output bit a.sub.k of the ADC. A corresponding reference voltage Vn<.sub.2.sup.k .times.j> is output at each Bit-Decision-Node. The control device adjusts the voltage V.sub.n<2.spsb.k.sub..times.j> on Bit-Decision-Node n<2.sup.k .times.j> to make V.sub.n<2.spsb.k.sub..times.j+BW(a.sbsb.k.sub.)> -V.sub.n<2.spsb.k.sub..times.j> approximately equal to V.sub.n<2.spsb.k.sub..times.j> -V.sub.n<2.spsb.k.sub..times.j-BW(a.sbsb.k.sub.)>, wherein BW(a.sub.k) is the weight value of the bit a.sub.k.
REFERENCES:
patent: 4578668 (1986-03-01), Sugimoto
patent: 4804941 (1989-02-01), Yoshii
patent: 5153592 (1992-10-01), Fairchild et al.
patent: 5471208 (1995-11-01), Sauer
patent: 5666118 (1997-09-01), Gerbasch
"Trimless High Precision Ratioed Resistors in D/A and A/D Converters," R. Wittman et al., IEEE Journal of Solid-State Circuits, vol. 30, No. 8, Aug. 1995, pp. 935-939.
Williams Howard L.
Winbond Electronics Corp.
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