Filtering adjacent channel blockers using signal-transfer-function of continuous-time ΣΔ modulators
Circuits and Systems, 2004. MWSCAS '04. The 2004 47th Midwest Symposium（2004）
摘要
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.
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关键词
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,signal transfer function,filtering,quantization,baseband,delta modulation,transfer function,genetic expression,discrete time,feedback loop
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