scispace - formally typeset
Search or ask a question
Topic

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: A new digital phase-locked-loop (DPLL) method is proposed for single-phase grid-connected power conversion systems and validated to have good dynamic and static performances through MATLAB simulations, simulator investigations, and experiments with a grid- connected photovoltaic system under different voltage conditions.
Abstract: A new digital phase-locked-loop (DPLL) method is proposed for single-phase grid-connected power conversion systems in this paper The analysis of a phase detector using trigonometric function transformation is presented in detail A sliding-window-based data sampling method is utilized to obtain the orthogonal signal related to the original input signal according to the periodic characteristic of the steady-state sine fundamental component, and the fictitious active and reactive power components are constructed On this basis, the DPLL method is developed It consists of an even harmonics elimination network, a grid voltage feedforward network, and a fictitious instantaneous power feedback phase correction network The fundamental signal of the grid voltage is extracted by an even harmonics elimination network and a digital Butterworth filter and a unit value controller to generate a unity sine reference signal for the feedforward network, whereas only the signs of the fictitious instantaneous active and reactive powers are used to revise the phase shift of the unity sine reference signal by means of a real-time variable step-size control in the feedback phase correction network The method is validated to have good dynamic and static performances through MATLAB simulations, simulator investigations, and experiments with a grid-connected photovoltaic system under different voltage conditions

61 citations

Journal ArticleDOI
TL;DR: This study presents an electronically tunable low-voltage mixed-mode universal biquad filter that can realise low pass, band pass and high pass responses in all the four possible modes, that is, voltage-mode, current- mode, trans-admittance- mode and trans-impedance-mode from the same configuration.
Abstract: This study presents an electronically tunable low-voltage mixed-mode universal biquad filter. The proposed filter employs only three current controlled current conveyor trans-conductance amplifiers (CCCCTAs) and two grounded capacitors. The proposed filter can realise low pass, band pass and high pass responses in all the four possible modes, that is, voltage-mode, current-mode, trans-admittance-mode and trans-impedance-mode from the same configuration. The filter can also realise regular notch, low-pass notch, high-pass notch and all pass responses in current and trans-admittance-mode, with interconnection of relevant output currents. The filter parameters namely pole frequency, quality factor, bandwidth and filter gains can be tuned electronically. Moreover, the circuit parameters such as pole frequency and quality factor can be simultaneously current controlled without affecting bandwidth. Effects of non-idealities and parasitic are also discussed. The circuit possesses low active and passive sensitivity and can be operated at low power supply (±1 V). The validity of the proposed filter is verified through computer simulations using PSPICE, the industry standard tool. Possible experimental setup for CCCCTA using commercial available integrated circuits is further discussed.

61 citations

Patent
30 Apr 2003
TL;DR: In this article, a notch filter with a high Q factor, integrated with a first and a second cascoded LNA, is totally contained on an integrated chip, comprising two Q-enhancement circuits, is coupled to the second differential LNA.
Abstract: A notch filter with a high Q factor, which is integrated with a first and a second cascoded LNA, is totally contained on an integrated chip. The notch filter, comprising two Q-enhancement circuits, is coupled to the second differential LNA. The two Q-enhancement circuits are combined to generate sufficient negative impedance to compensate for the loss in the on-chip low Q inductors. To improve the image rejection of the notch filter in a wide frequency band, the notch filter uses an automatic current tuning circuit which consists of an analog multiplier and fixed and voltage controlled current sources. Furthermore, by modifying the connection and location of the tunable varactor, another wideband tunable notch filter is implemented. The notch filter can be applied in all current wireless receiver systems.

60 citations

Journal ArticleDOI
TL;DR: A modified version of the Butterworth lowpass filter that can handle nonstationary signals is presented and has a variable cut-off frequency distribution defined for each data point, which is determined by local signal characteristics.

60 citations

Journal ArticleDOI
TL;DR: A technique for realizing a fully differential filter using an operational amplifier (op amp) without common-mode feedback (CMFB) is presented, which results in a smaller area, a reduced power dissipation, and an improved speed and dynamic range of the filter.
Abstract: A technique for realizing a fully differential filter using an operational amplifier (op amp) without common-mode feedback (CMFB) is presented. This technique results in a smaller area, a reduced power dissipation, and an improved speed and dynamic range of the filter. Experimental results of a biquad switched-capacitor bandpass filter with a center frequency of 3.5 MHz and a Q of 24 are presented. The op amp has an open-loop unity-gain bandwidth of 230 MHz, a phase margin greater than 50 degrees , and a DC gain of 76 dB. The prototype filter occupies only 0.26 mm/sup 2/ and dissipates 6 mW with a 5-V supply. >

60 citations


Network Information
Related Topics (5)
Amplifier
163.9K papers, 1.3M citations
85% related
Antenna (radio)
208K papers, 1.8M citations
83% related
CMOS
81.3K papers, 1.1M citations
82% related
Communications system
88.1K papers, 1M citations
81% related
Wireless
133.4K papers, 1.9M citations
81% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202322
202282
202140
202059
201941
201864