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Butterworth filter

About: Butterworth filter is a research topic. Over the lifetime, 6187 publications have been published within this topic receiving 69070 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, a bandwidth and wavelength programmable silicon double microring optical filter that can be automatically, accurately, and repeatably set to an optimal Butterworth shape for maximum passband flatness is presented.
Abstract: We demonstrate a bandwidth and wavelength programmable silicon double microring optical filter that can be automatically, accurately, and repeatably set to an optimal Butterworth shape for maximum passband flatness. The algorithm uses a critical coupling condition to set the Butterworth shapes, followed by bandwidth tuning using a calibration dataset for the coupling coefficients. Silicon microrings with independently tunable phase shifts and coupling coefficients were designed for and fabricated at a foundry to demonstrate the method. Fabrication variations and thermal crosstalk are also compensated automatically.

29 citations

Journal ArticleDOI
TL;DR: In this paper, an UHF third order bandpass filter based on an high-Q active inductor (AI) is described and measurement results, performed on a prototype board, are presented and compared with software simulations.
Abstract: In this article, an UHF third order bandpass filter based on an high-Q active inductor (AI) is described and measurement results, performed on a prototype board, are presented and compared with software simulations. The designed AI includes a passive variable phase- and amplitude-compensating network and a highly linear inverting amplifier, forming a gyrator-C architecture that gives to the filter also frequency and amplitude tuneability proprieties. The fabricated Butterworth filter has a center frequency of 600 MHz and a measured noise figure of 11 dB with a 5 dBm 1-dB compression point and a 82 dB dynamic range. All passive components values have been chosen to allow the circuit to be completely integrated in a standard IC design. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1426–1429, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26857

29 citations

Proceedings ArticleDOI
21 May 2006
TL;DR: An active inductor based bandpass radio-frequency filter circuit topology is presented that achieves a wide tuning range and is designed, simulated, and laid out in a 0.18mum CMOS process.
Abstract: An active inductor based bandpass radio-frequency (RF) filter circuit topology is presented that achieves a wide tuning range. Based on the proposed structure, a prototype 2/sup th/-order filter is designed, simulated, and laid out in a 0.18/spl mu/m CMOS process. The center frequency of the filter can be tuned from 880MHz to 3.72GHz. The quality factor of the filter can also be tuned. The filter, including the input and output buffers, consumes between 12 to 26mW from a 1.8V supply and occupies a chip area of 115/spl mu/m /spl times/ 70/spl mu/m.

29 citations

Journal ArticleDOI
TL;DR: A novel miniaturised dual-mode bandpass filter with multi-arc resonators is proposed, which can be reduced significantly by using the microstrip dual- mode resonator consisting ofmulti-arcs and insertion loss and spurious response suppression are improved.
Abstract: A novel miniaturised dual-mode bandpass filter with multi-arc resonators is proposed. The size of the dual-mode filter can be reduced significantly by using the microstrip dual-mode resonator consisting of multi-arcs; meanwhile insertion loss and spurious response suppression are improved. A prototype filter is designed and implemented at 3.6 GHz with 2.8% fractional bandwidth, which shows a low passband insertion loss of 1.02 dB and a wide stopband with rejection better than 20 dB up to about 8.5 GHz.

29 citations

Patent
Arthur B Glaser1
01 May 1969
TL;DR: In this paper, a time division multiplexed digital filter is used as the time invariant part of an N-path filter, which alleviates the problem of closely matching the transmission characteristics of each of the Npaths.
Abstract: A time division multiplexed digital filter is used as the timeinvariant part of an N-path filter. The use of a multiplexed digital filter alleviates the problem of closely matching the transmission characteristics of each of the N-paths.

29 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202322
202282
202140
202059
201941
201864