Title :
A third-order current-mode continuous-time ΣΔ modulator
Author :
Aboushady, H. ; Dessouky, M. ; Mendes, E. de Lira ; Loumeau, P.
Author_Institution :
Lab. LIP6, Paris VI Univ., France
Abstract :
In this paper, the design procedure for a third-order continuous-time ΣΔ modulator with RZ feedback is described. The circuit is realized using continuous-time current-mode integrators and DACs with switched-current sources. A design method to find the minimum biasing current required to achieve the desired dynamic range is presented. With a sampling frequency of 25.6 MHz, the circuit is expected to achieve 84 dB of dynamic range for a 100 kHz bandwidth input signal. The circuit operates from a power supply of 1.7 V and consumes 7.4 mW in a 0.35 μm CMOS process
Keywords :
CMOS integrated circuits; circuit feedback; continuous time systems; current-mode circuits; integrated circuit design; modulators; sigma-delta modulation; 0.35 micron; 1.7 V; 100 kHz; 25.6 MHz; 7.4 mW; CMOS process; DACs; RZ feedback; continuous-time ΣΔ modulator; current-mode integrators; current-mode sigma-delta modulator; design procedure; dynamic range; minimum biasing current; switched-current sources; third-order ΣΔ modulator; CMOS process; Circuit simulation; Delta modulation; Design methodology; Digital-analog conversion; Dynamic range; Feedback; Frequency; Space vector pulse width modulation; Switching circuits;
Conference_Titel :
Electronics, Circuits and Systems, 1999. Proceedings of ICECS '99. The 6th IEEE International Conference on
Conference_Location :
Pafos
Print_ISBN :
0-7803-5682-9
DOI :
10.1109/ICECS.1999.814502
