Delta-sigma analog-to-digital converter with chopper stabilizati

Details Delta-sigma analog-to-digital converter with chopper stabilizati Delta-sigma analog-to-digital converter with chopper stabilizati

1989-10-27

1991-08-13

Scott, J. R.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341118, H03M 302

Patent

active

050399896

ABSTRACT:
A chopper stabilized analog-to-digital converter includes an analog modulator (10) and a digital filter (12). The analog modulator (10) is comprised of four integrators, a first integrator (20) which is continuous time and the remaining stages of integration (22) which are either continuous or discrete. The first integrator (20) is a chopper stabilized integrator which is comprised of a chopper stabilized differential amplifier (32) which has a single ended output and operates in a continuous time mode. The modulator has a zero that is located at the harmonics of the sampling frequency of the modulator and the chopping clock for the chopper stabilized operation operates at the sampling frequency.

REFERENCES:
patent: 4509037 (1985-04-01), Harris et al.
patent: 4542354 (1985-09-01), Robinton et al.
patent: 4573037 (1986-02-01), Robinton et al.
patent: 4896156 (1990-01-01), Garverick
patent: 4912423 (1990-03-01), Milkovic et al.
patent: 4939516 (1990-07-01), Early

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