Differential switched-capacitor sigma-delta modulator

Details Differential switched-capacitor sigma-delta modulator Differential switched-capacitor sigma-delta modulator

1989-05-19

1991-03-19

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

341143, H04B 1406

Patent

active

050017250

ABSTRACT:
A fully differential sigma-delta signal processor for use in high-speed voiceband or higher-frequency applications. The processor receives the two polarities of a differential input signal and passes them to a differential-amplifier integrator through a switched sampling capacitor arrangement. The capacitors are each alternately and concurrently switched back and forth between the two signal paths for the two polarities of the input signal responsive to a clock signal in such a manner as to sample and integrate the input signal at an effective signal transfer rate of at least twice the clock frequency. An analog-to-digital converter defines a digital feedback-control signal characteristic of the integrator output signal. A second switched-capacitor arrangement selectively applies a feedback signal to the integrator inputs, responsive to the digital control signal, at a switching rate comparable to the effective signal transfer rate through the integrator.

REFERENCES:
patent: 4588981 (1986-05-01), Senn
patent: 4733219 (1988-03-01), Reusens et al.
patent: 4851841 (1989-07-01), Sooch
patent: 4896156 (1990-01-01), Garverick

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