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Voltage-controlled filter

About: Voltage-controlled filter is a research topic. Over the lifetime, 5514 publications have been published within this topic receiving 70872 citations. The topic is also known as: VCF.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, a second-order switched-capacitor bandpass filter was designed to operate at a switching frequency of 500 MHz, and the design of an operational amplifier with a simulated gain of 60 dB and a switch driver circuit was discussed.
Abstract: The design of GaAs MESFET technology is discussed. The design techniques developed are illustrated by means of a second-order switched-capacitor bandpass filter designed to operate at a switching frequency of 500 MHz. The design incorporates an operational amplifier architecture with a simulated gain of 60 dB and a switch driver circuit. Amplifiers are characterized in terms of settling time performance, and a general procedure for optimization of the switched-capacitor circuit to maximize switching frequency is presented. Measurements on a fabricated chip confirm the design of the filter and its components. >

23 citations

Journal ArticleDOI
TL;DR: In this paper, a simple topology of a current mode MOSFET-only filter with single-input and multi-output (SISO) transistors is proposed.
Abstract: In this paper, a very simple topology of a current mode MOSFET-only filter with single-input and multi-output is proposed. It is very important to emphasize that it is possible to obtain five of the filter functions, namely low-pass (LP), band-pass (BP), high-pass (HP), band-stop (BS) and all-pass (AP) using the proposed topology without using external passive elements. The core circuit of the proposed filter employs only four MOS transistors; therefore, it occupies very small chip area. It is also possible to adjust the filter gain with the biasing voltage. In addition, the circuit exhibits a very low input impedance and also high output impedances which make it possible for cascading. The MOSFET capacitances which determine the transfer functions are all grounded, so physical capacitances can be used instead of MOSFET parasitic capacitances to operate the filter at very low frequencies. Moreover, proposed filter structure has low supply voltage as 1 V in order to be applicable to low voltage operations. Detailed simulation results, including noise and Monte Carlo analysis, are provided using 0.18 µm TSMC technology parameters to verify the feasibility of the filter circuit.

23 citations

Proceedings ArticleDOI
07 Jun 2009
TL;DR: In this paper, a method for tracking the center frequency of a widely tunable evanescent-mode cavity filter in-situ is introduced, which enables a continuous feedback loop to lock in the filter center frequency and shape.
Abstract: In the present work, a method for tracking the center frequency of a widely tunable evanescent-mode cavity filter in-situ is introduced. The goal is to be able to monitor the performance of a filter without disturbing the fields or degrading the quality. The proposed method is to monitor the resonant frequency of each resonator of the filter independently by inducing higher order differential modes. This method enables a continuous feedback loop to lock in the filter center frequency and shape. An example filter is fabricated to demonstrate the concept and tuned from 1.4 to 3 GHz while monitoring the differential mode at 4 to 6.5 GHz. The ability to independently monitor and control the individual resonators in-situ without disturbing the main mode is demonstrated and is a crucial step towards a robust fielded widely tunable filter.

23 citations

Proceedings ArticleDOI
01 Nov 2008
TL;DR: In this paper, a filter structure for improving the performance of switching band controlled dynamic voltage restorer (DVR) and a systematic design procedure for the passive filter components are presented. And the proposed filter structure and design procedure are validated by carrying out PSCAD simulation studies.
Abstract: This paper presents a filter structure for improving the performance of switching band controlled Dynamic Voltage Restorer (DVR) and a systematic design procedure for the passive filter components. The switching operation of VSI is accompanied by a band controller which restricts the injected voltages within a band, defined about a reference voltage. Switching band control method exhibits merits such as fast dynamic response, robustness, zero magnitude / phase errors and ease in implementation. The performance of the band controller is improved using a novel filter structure. Quantitative expressions involving the dynamics of DVR and variation in switching frequency are also derived. The passive filter components are designed based on switching frequency and inverter rating. The proposed filter structure and design procedure for the DVR filter components are validated by carrying out PSCAD simulation studies.

23 citations

Proceedings Article
01 Jan 2000
TL;DR: In this paper, a new analog CMOS high-speed continuous-time FIR filter is presented, which has five taps with 6-bit weights and operates at an effective sampling rate of 606 MS/s.
Abstract: A new analog CMOS high-speed continuous-time FIR filter is presented. The filter has five taps with 6- bit weights and operates at an effective sampling rate of 606 MS/s. The circuit was fabricated in a 0.5 µm CMOS process and dissipates 51 mW while operating from a single 3 volt supply.

23 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20239
202229
20201
20188
2017150
2016199