Analysis of discrete-time charge-domain complex bandpass filter with accurately tunable center frequency

This paper proposes a new discrete-time complex bandpass (DT CBP) filter topology in charge domain, only using switches, capacitors, input transconductors and non-overlapping 2-phase clock scheme. The proposed DT filter features better power-efficiency, reduced complexity and easier process-scaling...

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Bibliographic Details
Published in2015 IEEE 58th International Midwest Symposium on Circuits and Systems (MWSCAS) pp. 1 - 4
Main Authors Yang Xu, Hyuk Sun, Un-Ku Moon
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2015
Subjects
Band-pass filters
Capacitors
Clocks
complex bandpass
discrete-time
filter
IIR filters
Impedance
non-overlapping
passive switched-capacitors
process-scaling
Topology
Transfer functions
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Summary:This paper proposes a new discrete-time complex bandpass (DT CBP) filter topology in charge domain, only using switches, capacitors, input transconductors and non-overlapping 2-phase clock scheme. The proposed DT filter features better power-efficiency, reduced complexity and easier process-scaling compared to the conventional topologies. It has an inherent anti-aliasing sinc characteristic due to the windowed integration of input voltage to current/charge during each phase. The center frequency is only determined by the capacitors ratio and sampling frequency, insensitive to PVT variations. The practical non-idealities, such as finite output impedance of input g m -stage, output impedance of source follower, non-zero switch resistance, etc. are mainly analyzed in this paper and compared with the simulated results. Simulations demonstrate that the proposed DT topology is quite robust to those non-idealities.
ISSN:1548-3746
1558-3899
DOI:10.1109/MWSCAS.2015.7282168