Title :
A low-power 22-bit incremental ADC
Author :
Quiquempoix, Vincent ; Deval, Philippe ; Barreto, Alexandre ; Bellini, Gabriele ; Márkus, János ; Silva, Jose ; Temes, Gabor C.
Author_Institution :
Microchip Technol. Inc, Chandler, AZ
fDate :
7/1/2006 12:00:00 AM
Abstract :
This paper describes a low-power 22-bit incremental ADC, including an on-chip digital filter and a low-noise/low-drift oscillator, realized in a 0.6-mum CMOS process. It incorporates a novel offset-cancellation scheme based on fractal sequences, a novel high-accuracy gain control circuit, and a novel reduced-complexity realization for the on-chip sinc filter. The measured output noise was 0.25 ppm (2.5 muVRMS), the DC offset 2 muV, the gain error 2 ppm, and the INL 4 ppm. The chip operates with a single 2.7-5 V supply, and draws only 120 muA current during conversion
Keywords :
CMOS integrated circuits; analogue-digital conversion; digital filters; low-power electronics; oscillators; 0.6 micron; 120 muA; 2.7 to 5.0 V; CMOS process; analog-to-digital conversion; fractal sequences; gain control circuit; incremental data converters; low-drift oscillator; low-noise oscillator; low-power electronics; offset-cancellation scheme; on-chip digital filter; sine filter; CMOS process; Computer science; Digital filters; Fractals; Gain control; Gain measurement; Integrated circuit measurements; Integrated circuit noise; Noise measurement; Switching converters; Analog-to-digital conversion; CMOS analog integrated circuits; delta-sigma modulation; incremental data converters; low-power electronics; mixed analog-digital integrated circuits; oversampling A/D converters; switched-capacitor circuits;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2006.873891
