Title :
A low-power 22-bit incremental ADC with 4 ppm INL, 2 ppm gain error and 2 μV DC offset
Author :
Quiquempoix, Vincent ; Deval, Philippe ; Barreto, Alexandre ; Bellini, Gabriele ; Collings, Jerry ; Márkus, János ; Silva, José ; Temes, Gabor C.
Author_Institution :
Microchip Technol. Inc., Chandler, AZ, USA
Abstract :
A low power 22bit incremental ADC, including an on-chip digital filter and a low noise/low drift oscillator, was realized in a 0.6-μm 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 sine filter. The measured output noise was 0.28 ppm (2.8 μVRMS), the dc offset 2 μV, the gain error 2 ppm, and the INL 4 ppm. The chip operates with a single 2.7-5 V supply, and draws only 125 μA current during conversion.
Keywords :
CMOS integrated circuits; analogue-digital conversion; digital filters; low-power electronics; oscillators; 0.6 micron; 125 muA; 2 muV; 2.7 to 5 V; 22 bit; CMOS process; analog-digital converter; fractal sequences; high accuracy gain control circuit; low drift oscillator; low noise oscillator; offset cancellation scheme; on chip sine filter; on-chip digital filter; CMOS process; Circuit noise; Digital filters; Fractals; Gain control; Gain measurement; Noise cancellation; Noise measurement; Oscillators; Semiconductor device measurement;
Conference_Titel :
Solid-State Circuits Conference, 2005. ESSCIRC 2005. Proceedings of the 31st European
Print_ISBN :
0-7803-9205-1
DOI :
10.1109/ESSCIR.2005.1541655
