Title :
Nyquist-criterion based design of a CT ΣΔ-ADC with a reduced number of comparators
Author :
De Maeyer, J. ; Rombouts, P. ; Weyten, L.
Author_Institution :
Ghent Univ., Ghent
Abstract :
In this paper we present the design of a continuous time ΣΔ-modulator in a 0.35 μm technology. While using a 6-bit internal quantizer a total of only 15 comparators were implemented. The inherent loop delay is accounted for in the design by using a design strategy based on the Nyquist stability criterion and the vector gain margin. Measurement results show a Peak SNR of 82 dB and a dynamic range of 85 dB for a bandwidth of 1.5 MHz.
Keywords :
Nyquist stability; comparators (circuits); continuous time systems; integrated circuit design; sigma-delta modulation; ΣΔ-modulators; Nyquist stability criterion; bandwidth 1.5 MHz; comparators; continuous time A/D covertors; internal quantizer; loop delay; size 0.35 μm; vector gain margin; word length 6 bit; Bandwidth; Clocks; Delay; Dynamic range; Filters; Information systems; Jitter; Quantization; Stability criteria; Virtual reality;
Conference_Titel :
Electronics, Circuits and Systems, 2006. ICECS '06. 13th IEEE International Conference on
Conference_Location :
Nice
Print_ISBN :
1-4244-0394-4
Electronic_ISBN :
1-4244-0395-2
DOI :
10.1109/ICECS.2006.379812
