Combination shared capacitor integrator and digital-to-analog co

Details Combination shared capacitor integrator and digital-to-analog co Combination shared capacitor integrator and digital-to-analog co

1996-04-10

1998-03-17

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341150, 341143, H03M 166

Patent

active

057292329

ABSTRACT:
A modulator, in conjunction with a load circuit, is provided. The modulator forms part of an A/D converter system. The modulator includes a series of switched capacitors connected in a shared capacitor arrangement. The shared capacitors receive samples from an input signal and, depending upon the logic value fed into a D/A converter, the shared capacitor further receives a feedback reference voltage. The reference voltage is thereby coupled to the switched capacitor network, as well as to a load circuit which cancels data-dependent values modulated upon the reference voltage supply. The load circuit thereby serves to eliminate ac components within the reference voltage supply resulting from data dependent loading.

REFERENCES:
patent: 4851841 (1989-07-01), Sooch
patent: 5323158 (1994-06-01), Ferguson, Jr.
patent: 5412387 (1995-05-01), Vincelette et al.
patent: 5451950 (1995-09-01), Vincelette et al.
Ribner, et al., "A Third-Order Multi Stage Sigma-Delta Modulator With Reduced Sensitivity to Nonidealities", IEEE Journal of Solid-State Circuits, vol. 26, No. 12 (Dec. 1991), pp. 1764-1774.
Harris, Steven, "How to Achieve Optimum Performance from Delta Sigma A/D and D/A Converters", J. Audio Eng. Soc. vol. 41, No. (Oct. 1993), pp. 782-790.

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