Title :
Statistical error shaping for mismatch cancellation in complex bandpass delta-sigma modulators
Author :
Riches, J. ; Erdol, N. ; Alhalabi, B.
Author_Institution :
Motorola Inc., USA
Abstract :
A new technique using switched capacitors is proposed for shaping component mismatch error in the real and imaginary paths of a complex filter and its effects are illustrated via simulations. Complex filters provide improved performance over a pair of real bandpass filters of the same order. This is possible due to elimination of redundant conjugate pairs of poles and zeros in its noise and signal transfer function. Advantages of using complex filters are clearly seen in such applications as bandpass delta-sigma modulators, used in the conversion of narrowband quadrature IF (intermediate frequency) cellular signals
Keywords :
band-pass filters; circuit noise; delta-sigma modulation; modulators; poles and zeros; radio receivers; switched capacitor filters; transfer functions; IF cellular signals; complex bandpass delta-sigma modulators; complex filter; component mismatch error; imaginary paths; mismatch cancellation; narrowband quadrature intermediate frequency signals; noise; poles; radio receivers; real bandpass filters; real paths; redundant conjugate pairs elimination; signal transfer function; statistical error shaping; switched capacitors; zeros; Amplitude modulation; Band pass filters; Degradation; Delta modulation; Frequency; Mixers; Passband; Poles and zeros; Switched capacitor networks; Transfer functions;
Conference_Titel :
Signal Processing Systems, 2000. SiPS 2000. 2000 IEEE Workshop on
Conference_Location :
Lafayette, LA
Print_ISBN :
0-7803-6488-0
DOI :
10.1109/SIPS.2000.886775
