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CLC number: TN710

On-line Access: 2010-03-22

Received: 2009-07-01

Revision Accepted: 2009-11-30

Crosschecked: 2010-01-29

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Journal of Zhejiang University SCIENCE C 2010 Vol.11 No.4 P.307-314

http://doi.org/10.1631/jzus.C0910390


Discrete-time charge analysis for a digital RF charge sampling mixer


Author(s):  Yun Pan, Ning Ge, Xiao-lang Yan, Xiao-peng Yu

Affiliation(s):  Institute of VLSI Design, Zhejiang University, Hangzhou 310027, China, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China

Corresponding email(s):   panyun@vlsi.zju.edu.cn

Key Words:  Digital RF, Charge sampling, Discrete-time, Pseudo-differential, Switch-on resistance


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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.

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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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