Title :
A novel two-channel time-interleaved forth-order sigma-delta modulator topology
Author :
Yang, Xiao ; Chen, Guican ; Cheng, Jun ; Xu, Xiaoyun
Author_Institution :
Dept. of Microelectron., Xian Jiaotong Univ., Xian
fDate :
Nov. 30 2008-Dec. 3 2008
Abstract :
Time-interleaved (TI) sigma-delta modulators are sensitive to channel-mismatches. In this paper, a new type of noise transfer function (NTF) which is a band-pass filter is adopted for the two-channel TI modulators to reduce the folded noise. Employing the concept of block digital filtering and theory of multirate operations, a novel two-channel TI high-order modulator is derived from the prototype of a conventional single-channel modulator. The simulation results show that the proposed modulator is insensitive to channel mismatches.
Keywords :
band-pass filters; digital filters; network topology; sigma-delta modulation; transfer functions; band-pass filter; block digital filtering; conventional single-channel modulator; forth-order sigma-delta modulator topology; noise transfer function; two-channel time-interleaved modulator; Band pass filters; Bandwidth; Delta-sigma modulation; Digital filters; Digital modulation; Filtering theory; Noise reduction; Sampling methods; Topology; Transfer functions;
Conference_Titel :
Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on
Conference_Location :
Macao
Print_ISBN :
978-1-4244-2341-5
Electronic_ISBN :
978-1-4244-2342-2
DOI :
10.1109/APCCAS.2008.4746229
