CLC number: TN710
On-line Access: 2010-03-22
Received: 2009-07-01
Revision Accepted: 2009-11-30
Crosschecked: 2010-01-29
Cited: 0
Clicked: 8551
Yun Pan, Ning Ge, Xiao-lang Yan, Xiao-peng Yu. Discrete-time charge analysis for a digital RF charge sampling mixer[J]. Journal of Zhejiang University Science C, 2010, 11(4): 307-314.
@article{title="Discrete-time charge analysis for a digital RF charge sampling mixer",
author="Yun Pan, Ning Ge, Xiao-lang Yan, Xiao-peng Yu",
journal="Journal of Zhejiang University Science C",
volume="11",
number="4",
pages="307-314",
year="2010",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.C0910390"
}
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%T Discrete-time charge analysis for a digital RF charge sampling mixer
%A Yun Pan
%A Ning Ge
%A Xiao-lang Yan
%A Xiao-peng Yu
%J Journal of Zhejiang University SCIENCE C
%V 11
%N 4
%P 307-314
%@ 1869-1951
%D 2010
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.C0910390
TY - JOUR
T1 - Discrete-time charge analysis for a digital RF charge sampling mixer
A1 - Yun Pan
A1 - Ning Ge
A1 - Xiao-lang Yan
A1 - Xiao-peng Yu
J0 - Journal of Zhejiang University Science C
VL - 11
IS - 4
SP - 307
EP - 314
%@ 1869-1951
Y1 - 2010
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.C0910390
Abstract: This paper presents an approach for analyzing the key parts of a general digital radio frequency (RF) charge sampling mixer based on discrete-time charge values. The cascade sampling and filtering stages are analyzed and expressed in theoretical formulae. The effects of a pseudo-differential structure and CMOS switch-on resistances on the transfer function are addressed in detail. The DC-gain is restrained by using the pseudo-differential structure. The transfer gain is reduced because of the charge-sharing time constant when taking CMOS switch-on resistances into account. The unfolded transfer gains of a typical digital RF charge sampling mixer are analyzed in different cases using this approach. A circuit-level model of the typical mixer is then constructed and simulated in Cadence SpectreRF to verify the results. This work informs the design of charge-sampling, infinite impulse response (IIR) filtering, and finite impulse response (FIR) filtering circuits. The discrete-time approach can also be applied to other multi-rate receiver systems based on charge sampling techniques.
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