Title :
Fourth-Order Discrete-Time Variable Centre Frequency Bandpass Sigma-Delta Modulator
Author :
Zhu, Y. ; Al-Sarawi, S.F. ; Lim, C.C. ; Liebelt, M.J.
Abstract :
A design for a variable centre frequency bandpass sigma-delta modulator is presented. The modulator is based on a tunable discrete-time resonator using only one control parameter. The noise transfer function of the modulator is controlled by a 4-bit digital signal, which provides nine different centre frequencies distributed between 0.1-0.4 normalized frequencies. The measurement results show a stable modulator at all centre frequencies
Keywords :
discrete time systems; sigma-delta modulation; transfer functions; fourth-order discrete-time variable centre frequency bandpass sigma-delta modulator; noise transfer function; tunable discrete-time resonator; Circuit noise; Delta-sigma modulation; Filters; Frequency modulation; Noise shaping; Sampling methods; Signal to noise ratio; Topology; Tunable circuits and devices; Tuning; ADC; BPSDM; NTF; SNR;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342147
