Title :
Sine-shaping mixer for continuous-time ΣΔ ADCs
Author :
Ashry, Ahmed ; Aboushady, Hassan
Author_Institution :
LIP6 Lab., Univ. of Pierre & Marie Curie, Paris VI, Paris, France
Abstract :
Sine-shaping of feedback DAC current in continuous-time ΣΔ ADCs is an effective solution to enhance their immunity to clock jitter. In this paper, a simple mixer circuit for producing a sine-shaped output in continuous-time ΣΔ ADCs is introduced. The proposed solution does not need extra clock source or synchronization circuit, as the mixer utilizes the same clock applied to the comparator. It is also shown the that the proposed circuit is immune to temperature and process variations. Simulation results of the proposed circuit implemented in 130 nm CMOS process show good agreement with the expected results. I.
Keywords :
CMOS integrated circuits; analogue-digital conversion; feedback; jitter; mixers (circuits); synchronisation; CMOS process; clock jitter; clock source; continuous-time ΣΔ ADC; feedback DAC current; process variation; sine-shaping mixer circuit; size 130 nm; synchronization circuit; temperature variation; Clocks; Delay; Jitter; Mixers; Modulation; Simulation; Synchronization;
Conference_Titel :
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4244-9473-6
Electronic_ISBN :
0271-4302
DOI :
10.1109/ISCAS.2011.5937765
