Variable voltage generator for delta-sigma modulators

Details Variable voltage generator for delta-sigma modulators Variable voltage generator for delta-sigma modulators

2007-06-29

2008-10-21

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S172000

Reexamination Certificate

active

07439892

ABSTRACT:
A modulator integrator circuit includes an amplifier having a capacitive feedback connection, a variable voltage generator, a fixed voltage reference, and a capacitor having a first plate and a second plate. The first plate of the capacitor is coupled to the variable voltage generator. The modulator reference circuit further includes a first switch that selectively couples the second plate of the capacitor to the amplifier and a second switch that selectively couples the second plate of the capacitor to the fixed voltage reference.

REFERENCES:
patent: 5659586 (1997-08-01), Chun
patent: 6366230 (2002-04-01), Zhang et al.
patent: 7274231 (2007-09-01), Gillespie et al.
patent: 7321324 (2008-01-01), Piovaccari
B. Del Signore & S. Harris, “Voltage References for SAR-Type A/D Converters”; Crystal Semiconductor Corporation, Austin, TX; 1996; 12 pages.
J. Wu; “Input Currents for High-Resolution ADCS”; Texas Instruments, Application Report; SBAA090-Apr. 2003; 9 pages.

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