UM
Analysis and modeling of a gain-boosted n-path switched-capacitor bandpass filter
Zhicheng Lin1; Pui-In Mak1; Rui P. Martins1,2
2014
Source PublicationIEEE Transactions on Circuits and Systems I: Regular Papers
ISSN1549-8328
Volume61Issue:9Pages:2560-2568
Abstract

It has been studied that, an N-path switched-capacitor (SC) branch driven by an N-phase non-overlapped local oscillator (LO), is equivalent to a tunable parallel-RLC tank suitable for radio-frequency (RF) filtering. This paper proposes a gain-boosted N-path SC bandpass filter (GB-BPF) with a number of sought features. It is based on a transconductance amplifier (G) with an N-path SC branch as its feedback network, offering: 1) double RF filtering at the input and output of the G in one step; 2) customized passband gain and bandwidth with input-impedance match; and 3) reduced physical capacitance thanks to the loop gain offered by G. All have been examined using a RLC model of the SC branch before applying the linear periodically time-variant (LPTV) analysis to derive the R, L, and C expressions and analytically study the harmonic selectivity, harmonic folding, and noise. The latter reveals that: 1) the noise due to the switches is notched at the output, allowing smaller switches to save the LO power and 2) the noises due to the source resistance and G are narrowband at the output, reducing the folded noise during harmonic mixing. To study the influence of circuit non-idealities, an intuitive equivalent circuit model is also proposed and verified. The design example is a four-path 0.5-2-GHz GB-BPF simulated with the 65-nm CMOS. It exhibits >11 dB gain, <2.3 dB NF, and +21-dBm out-of-band IIP3 at 150-MHz offset, while consuming just 7 mW of power. © 2014 IEEE.

KeywordBandpass Filter Bandwidth Cmos Feedback Network Gain Boosted Harmonic Mixing Input-impedance Match Linear Periodically Time-variant (Lptv) Local Oscillator (Lo) N-path Passive Mixer Radio-frequency (Rf) Filtering Receiver Switched-capacitor (Sc) Switches Transconductance Amplifier
DOIhttp://doi.org/10.1109/TCSI.2014.2312476
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000341593700005
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Citation statistics
Cited Times [WOS]:25   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.State-Key Laboratory of Analog and Mixed-Signal VLSI and FST-ECE, University of Macau, Macao, China
2.Instituto Superior Técnico, University of Lisbon, Portugal
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Zhicheng Lin,Pui-In Mak,Rui P. Martins. Analysis and modeling of a gain-boosted n-path switched-capacitor bandpass filter[J]. IEEE Transactions on Circuits and Systems I: Regular Papers,2014,61(9):2560-2568.
APA Zhicheng Lin,Pui-In Mak,&Rui P. Martins.(2014).Analysis and modeling of a gain-boosted n-path switched-capacitor bandpass filter.IEEE Transactions on Circuits and Systems I: Regular Papers,61(9),2560-2568.
MLA Zhicheng Lin,et al."Analysis and modeling of a gain-boosted n-path switched-capacitor bandpass filter".IEEE Transactions on Circuits and Systems I: Regular Papers 61.9(2014):2560-2568.
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