Topic
Butterworth filter
About: Butterworth filter is a research topic. Over the lifetime, 6187 publications have been published within this topic receiving 69070 citations.
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Papers
More filters
12 Jul 2014
TL;DR: This paper presents fully-differential, first-order, low-pass, high-pass and all-pass filter sections operating in current-mode, using the recently introduced Digitally Controllable Differential Voltage Current Conveyor as the active building block.
Abstract: Analog signal processing in the current-mode regime offers several advantages over its voltage-mode counterpart. Although, current-mode circuits exhibit better noise performance, fully-differential topologies may be employed to improve the noise cancellation,on account of their common-mode rejection properties. This paper presents fully-differential, first-order, low-pass, high-pass and all-pass filter sections operating in current-mode. The recently introduced Digitally Controllable Differential Voltage Current Conveyor (DC-DVCC) has been chosen as the active building block. Programmability of the filter characteristics through a digital control word is demonstrated.
20 citations
TL;DR: This paper presents an electronically tunable current/trans-impedance-mode biquad universal filter employing only single multi-output current controlled current conveyor trans-conductance amplifier (MO-CCCCTA) and two grounded capacitors.
Abstract: This paper presents an electronically tunable current/trans-impedance-mode biquad universal filter employing only single multi-output current controlled current conveyor trans-conductance amplifier (MO-CCCCTA) and two grounded capacitors. The proposed filter realizes all the standard filter func-tions i.e. low pass (LP), band pass (BP) and high pass (HP), notch and all pass (AP) filters in the current form at high impedance output through appropriate selection of the input signals, without any matching conditions. Simultaneously, it can also realize all the standard filter functions in trans-impedance form from the same circuit topology. The circuit does not require inverting-type input current signal(s) and double input current signal(s) to realize all the responses in the design. The validity of proposed filter is verified through PSPICE simulations.
20 citations
TL;DR: In this article, a novel mixed-mode universal filter using a single new active device namely specific current feedback operational amplifier (SCFOA) is suggested, which can simultaneously realize low-pass, band-pass and notch filter responses, and can provide highpass and all-pass filter responses with interconnection of the relevant output currents.
Abstract: In this paper, a novel mixed-mode universal filter using a single new active device namely specific current feedback operational amplifier (SCFOA) is suggested. Mixed-mode called as dual-mode can provide either current-mode (CM) or voltage-mode (VM) responses with relevant input port selections. The proposed CM filter can simultaneously realize low-pass, band-pass and notch filter responses, and can provide high-pass and all-pass filter responses with interconnection of the relevant output currents. Further, the VM filter selection can provide universal filter responses. The CM and VM biquads offer independent control of angular resonance frequency ( ω 0 ) and quality factor ( Q ), and have low active and passive component sensitivities. However, CM filter is more suitable for integrated circuit (IC) process because of consisting of only grounded passive elements. A number of computer simulations by means of SPICE program are included to confirm the claimed theory.
20 citations
TL;DR: In this article, a new current-mode universal active-RC filter is proposed based on a new universal passive filter topology, which is generated from a classical well known universal passive filters applying a transformation procedure.
Abstract: In this paper, a new current-mode universal active-RC filter is proposed. The proposed circuit is based on a new universal passive filter topology. This passive filter is generated from a classical well known current-mode universal passive filter applying a transformation procedure. Two Fully Differential Current Conveyors (FDCCII) are used to construct a universal active-RC filter from this passive filter. The FDCCII based proposed filter has only grounded resistors and capacitors as the passive elements. The circuit simultaneously provides the three basic filter characteristics, namely high-pass (HP), band-pass (BP) and low-pass (LP). SPICE simulation results are given to verify the theoretical analysis.
20 citations
TL;DR: In this paper, the SIW structure is realized by via-holes and can be integrated with other circuits on the same substrate using inductive windows at satellite communication band is discussed The SIW filter has the insertion loss of 285 dB and return loss of 1757 dB at the center frequency of 12 GHz.
Abstract: In this paper, the harmonics suppressed waveguide filter with SIW (substrate-integrated waveguide) structure using inductive windows at satellite communication band is discussed The SIW structure is realized by via-holes and can be integrated with other circuits on the same substrate The SIW filter has the insertion loss of 285 dB and return loss of 1757 dB at the center frequency of 12 GHz Also, the proposed SIW filter has the harmonics suppression under 20 dB until 30 GHz by inserted low-pass filter (LPF) This harmonics suppressed SIW filter can be used in satellite communication systems © 2007 Wiley Periodicals, Inc Microwave Opt Technol Lett 50: 447–450, 2008; Published online in Wiley InterScience (wwwintersciencewileycom) DOI 101002/mop23114
20 citations