Title :
A low-voltage low-power sigma-delta modulator with improved performance in overload condition
Author :
Thompson, Hugh ; Hufford, Michael ; Evans, William ; Naviasky, Eric
Author_Institution :
Cadence Design Services, Columbia, MD, USA
Abstract :
A 4th-order sigma-delta modulator is presented that offers significantly improved stability and SNR when the input is overloaded, compared to conventional single-bit modulators. The circuit combines the high linearity of a single-bit architecture with the increased stability of a multi-bit converter. Fabricated in a 0.13-μm CMOS logic process, it draws 208 μA from a 1.25 V nominal supply. Clocked at 1.5 MHz, the input bandwidth is 150 Hz-11 kHz, with an SNR of 84 dB.
Keywords :
CMOS integrated circuits; circuit stability; low-power electronics; sigma-delta modulation; 0.13 micron; 1.25 V; 1.5 MHz; 208 muA; CMOS logic process; circuit linearity; converter stability; input overload condition; low-voltage low-power sigma-delta modulator; multibit converter; single-bit modulators; Auditory system; Batteries; CMOS process; Circuit stability; Delta-sigma modulation; Digital filters; Fires; Linearity; Noise shaping; Signal to noise ratio;
Conference_Titel :
Custom Integrated Circuits Conference, 2004. Proceedings of the IEEE 2004
Print_ISBN :
0-7803-8495-4
DOI :
10.1109/CICC.2004.1358873
