Title :
An anti-aliasing multi-rate ΣΔ modulator
Author :
Carusone, Anthony Chan ; Maloberti, Franco
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada
Abstract :
By splitting the input sampling capacitor of a SigmaDelta modulator into several time-interleaved branches, FIR filtering can be incorporated into the signal transfer function. Doing so imposes little or no overhead in the design of the opamps. Simulations of a 3rd-order modulator demonstrate that up to 65 dB of anti-aliasing can be obtained with 5 time-interleaved switched capacitor branches.
Keywords :
FIR filters; antialiasing; operational amplifiers; sigma-delta modulation; switched capacitor filters; 3rd-order modulator; FIR filtering; antialiasing multirate SigmaDelta modulator; opamp design; sampling capacitor; signal transfer function; time-interleaved switched capacitor; Capacitors; Circuits; Digital filters; Digital modulation; Digital signal processing; Filtering; Finite impulse response filter; Frequency; Interference; Sampling methods;
Conference_Titel :
Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-3827-3
Electronic_ISBN :
978-1-4244-3828-0
DOI :
10.1109/ISCAS.2009.5118009
