Combining fully-differential and single-ended signal processing

Details Combining fully-differential and single-ended signal processing Combining fully-differential and single-ended signal processing

1989-10-27

1991-11-26

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341172, 375 28, H03M 302

Patent

active

050686607

ABSTRACT:
An oversampling analog-to-digital modulator includes an analog loop filter which has a first integrator stage which is a single-ended integrator. The second, third, and fourth integrator stages are fully-differential integrators. The first integrator provides the required thermal noise characteristics of the loop filter with only one feedback capacitor which is external to the integrated circuit chip, while the fully-differential integrator stages provide improved suppression of charge injection transients.

REFERENCES:
patent: 4857928 (1989-08-01), Gailus et al.
patent: 4866442 (1989-09-01), Steim et al.
Kuo-Chiang Hsieh et al., "A Low-Noise Chopper-Stabilized Differential Switched-Capacitor Filtering Technique," IEEE Journal of Solid-State Circuits, vol. SC-16, No. 6, Dec. 1981.
Norsworthy, Steven R. et al., "A 14-Bit 80-kHz Sigma-Delta A/D Converter: Modeling, Design and Performance Evaluation," IEEE J. of Solid-State Circuits, vol. 24, No. 2, Apr. 1989.

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