Title :
A low-voltage switched-current delta-sigma modulator
Author :
Tan, Nianxiong ; Eriksson, Sven
Author_Institution :
Dept. of Electr. Eng., Linkoping Univ., Sweden
fDate :
5/1/1995 12:00:00 AM
Abstract :
This paper presents the design of a fully differential switched-current delta-sigma modulator using a single 3.3-V power-supply voltage. At system level, we tailor the modulator structure considering the similarity and difference of switched-capacitor and switched-current realizations. At circuit level, we propose a new switched-current memory cell and integrator with improved common mode feedback, without which low power-supply-voltage operation would not be possible. The whole modulator was implemented in a 0.8-μm double-metal digital CMOS process. It occupies an active area of 0.53×0.48 mm2 and consumes a current of 0.6 mA from a single 3.3-V power supply. The measured dynamic range is over 10 b
Keywords :
CMOS integrated circuits; analogue storage; circuit feedback; integrating circuits; mixed analogue-digital integrated circuits; modulators; sigma-delta modulation; switched current circuits; 0.6 mA; 0.8 micron; 3.3 V; common mode feedback; double-metal digital CMOS process; fully differential configuration; low-voltage operation; single power-supply voltage; switched-current delta-sigma modulator; switched-current integrator; switched-current memory cell; CMOS process; Capacitors; Clocks; Delay; Delta modulation; Digital modulation; Feedback; Power supplies; Switching circuits; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
