Title :
Filtering adjacent channel blockers using signal-transfer-function of continuous-time ΣΔ modulators
Author :
Beilleau, N. ; Aboushady, H. ; Lou?«rat, M.M.
Author_Institution :
Paris VI Univ., France
Abstract :
In this paper, we show that the signal transfer function of continuous-time ΣΔ modulators can be used to remove the baseband analog filters in radio receivers. General expressions for the signal transfer function of continuous-time ΣΔ modulators are derived. Comparisons between the frequency response of feedforward and feedback architectures of discrete-time and continuous-time ΣΔ modulators are established. Filtering of GSM adjacent channel blockers using a 5th order continuous-time ΣΔ is given as an example.
Keywords :
cellular radio; filtering theory; frequency response; radio receivers; sigma-delta modulation; transfer functions; GSM; adjacent channel blocker filtering; continuous time sigma-delta modulators; discrete time modulators; feedback architecture; feedforward architecture; frequency response; radio receivers; signal transfer function; Baseband; Delta modulation; Equations; Feedback loop; Filtering; Filters; GSM; Genetic expression; Quantization; Transfer functions;
Conference_Titel :
Circuits and Systems, 2004. MWSCAS '04. The 2004 47th Midwest Symposium on
Print_ISBN :
0-7803-8346-X
DOI :
10.1109/MWSCAS.2004.1353994
