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2016 | OriginalPaper | Buchkapitel

Towards Low Power N-Path Filters for Flexible RF-Channel Selection

verfasst von : Eric A. M. Klumperink, Michiel C. M. Soer, Remko E. Struiksma, Frank E. van Vliet Nauta, Bram Nauta

Erschienen in: Efficient Sensor Interfaces, Advanced Amplifiers and Low Power RF Systems

Verlag: Springer International Publishing

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Abstract

N-path filters can offer high-linearity high-Q channel selection filtering at a flexibly programmable RF center frequency, which is highly wanted for Software Defined Radio. Relying on capacitors and MOSFET switches, driven by digital non-overlapping clocks, N-path filters fit well to CMOS and benefit from Moore’s law. The basis of this filtering is the linear periodically time variant (LPTV) behaviour of a switch-R-C series circuit, which realizes frequency translated filtering, where a baseband filter characteristic is shifted around the switching frequency. This paper reviews the basic concept of N-path filters and recent developments, with special attention to possibilities to reduce power consumption by increasing the impedance level. The basic operation of the switch-R-C kernel that is at the core of N-path filtering is reviewed in terms of transfer function and noise performance.

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Fußnoten
1
In particular, the normalized sinc function \( sinc(x)=\frac{ \sin \left(\pi x\right)}{\pi x} \).
 
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Metadaten
Titel
Towards Low Power N-Path Filters for Flexible RF-Channel Selection
verfasst von
Eric A. M. Klumperink
Michiel C. M. Soer
Remko E. Struiksma
Frank E. van Vliet Nauta
Bram Nauta
Copyright-Jahr
2016
DOI
https://doi.org/10.1007/978-3-319-21185-5_15

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