Switched-capacitance coupling networks for differential-input am

Details Switched-capacitance coupling networks for differential-input am Switched-capacitance coupling networks for differential-input am

1988-10-03

1990-01-23

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341172, 332106, 375 28, H03M 302

Patent

active

048961566

ABSTRACT:
A differential delta-sigma modulator of switched-capacitance type is operated with a three-phase cycle, rather than the two-phase cycle of the prior art. In the first phase of operation the switched capacitors are charged in accordance with the previous single-bit output of the modulator. Structural modifications permit the switching capacitors to be connected in series to receive the modulator input voltage during the second phase of operation so that voltage need not be balanced with regard to any specified common-mode potential. In the third phase of operation the switched capacitors discharge from first plates thereof to the differential-input integrator while the second plates thereof are driven in accordance with the previous single-bit output of the modulator.

REFERENCES:
patent: 4119960 (1978-10-01), Hill
patent: 4542354 (1985-09-01), Robinton et al.
patent: 4733171 (1988-03-01), Milkovic
patent: 4837527 (1989-06-01), Sauer
"A Use of Limit Cycle Oscillators to Obtain Robust Analog to Digital Converters", J. G. Candy, IEEE Transactions on Communications, vol. COM-27, No. 3, pp. 298-305, Mar. 1974.
"Using Triangularly Weighter Interpolation to Get 13-Bit PCM from a Sigma-Delta Modulator", J. G. Candy et al., IEEE Transactions on Communications, vol. COM-24, No. 11, pp. 1268-1275, Nov. 1976.
"A Use of Double Integration in Signal Delta Modulation", J. G. Candy, IEEE Transactions on Communications, vol. COM-33, No. 3, pp. 249-258, Mar. 1985.
"Circuit and Technology Considerations for MOS Delta-Sigma AID Converters", M. W. Hauser et al., 1986, IEEE International Symposium on Circuits and Systems Proceedings, pp. 1310-1315, May 1986.
"A Low-Noise Chopper-Stabilized Differential Switched-Capacitor Filtering Technique", K.-C. Hsieh et al., IEEE Journal of Solid-State Circuits, vol. SC-16, No. 6, pp. 458-465, Dec. 1981.

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