scispace - formally typeset
Search or ask a question
Topic

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: A reconfigurable microwave photonic (MWP) multiband filter with selectable and switchable passbands is proposed and experimentally demonstrated, with a maximum of 12 simultaneous passbands evenly distributed from 0 to 10 GHz.
Abstract: A reconfigurable microwave photonic (MWP) multiband filter with selectable and switchable passbands is proposed and experimentally demonstrated, with a maximum of 12 simultaneous passbands evenly distributed from 0 to 10 GHz. The scheme is based on the generation of tunable optical comb lines using a two-stage Lyot loop filter, such that various filter tap spacings and spectral combinations are obtained for the configuration of the MWP filter. Through polarization state adjustment inside the Lyot loop filter, an optical frequency comb with 12 different comb spacings is achieved, which corresponds to a MWP filter with 12 selectable passbands. Center frequencies of the filter passbands are switchable, while the number of simultaneous passbands is tunable from 1 to 12. Furthermore, the MWP multiband filter can either work as an all-block, single-band or multiband filter with various passband combinations, which provide exceptional operation flexibility. All the passbands have over 30 dB sidelobe suppression and 3-dB bandwidth of 200 MHz, providing good filter selectivity.

54 citations

Journal ArticleDOI
TL;DR: In this article, a dual-band lumped-element bandpass filter (DBLEF) is presented, which is implemented in low-temperature co-fired ceramic. But this filter is unique in that it utilizes only a single set of lumped components to create a dualpassband response.
Abstract: In this study, a dual-band lumped-element bandpass filter (DBLEF) is presented, which is implemented in low-temperature co-fired ceramic. The design utilizes the tight component coupling possible in this technology to mimic a much more complex network of lumped components. The filter is unique in that it utilizes only a single set of lumped components to create a dual-passband response. Detailed design equations are presented for the dual-band design, and a DBLEF having passbands at 2.4 and 5.2 GHz is demonstrated, representing the common wireless local area network bands. This paper both introduces a novel approach to lumped-element dual-band filtering, while also demonstrating an effective method of implementing this complex filter in multilayer technology with a very small footprint. Both measured and simulated results verify the approach with the overall size of the filter only 154times135times22.8 mil3 (3.85times3.38times0.57 mm 3)

54 citations

Proceedings ArticleDOI
01 Jan 2002
TL;DR: In this article, the Variable Structure Filter (VSTF) is proposed for estimating state variables in a linear system subject to random disturbances and measurement noise, and a proof of stability for the filter is provided.
Abstract: This paper presents a new strategy for estimation of state variables. The strategy may be applied to linear systems and is referred to as the Variable Structure Filter. The filter is considered for discrete-time systems subject to random disturbances and measurement noise. A proof of stability for the filter is provided. For stability, this filtering concept requires a specification of an upper bound for the random disturbances and measurement noise. The filter requires a parametric model and can be formulated to accommodate model uncertainties. The application of this filter to a third order linear system is demonstrated.Copyright © 2002 by ASME

54 citations

Journal ArticleDOI
TL;DR: An integrated fifth-order continuous-time low-pass filter for a WiMedia ultrawideband radio receiver is described in this paper and achieves a 7.8-nVradicHz input-referred noise density.
Abstract: An integrated fifth-order continuous-time low-pass filter for a WiMedia ultrawideband radio receiver is described in this paper. The prototype filter is realized with a passive pole at the filter input and a fourth-order leapfrog filter in which the gm-C technique with pseudodifferential transconductors is used. The transconductors do not include internal nodes, and they are designed to have a nominal 26-dB dc gain, of which process, voltage, and temperature variations are controlled by means of a negative resistance circuit. The losses of the low-dc-gain filter integrators are already taken into account in the filter synthesis. The passband edge frequency of the implemented filter is 240 MHz in order to receive multiband-orthogonal-frequency-division-multiplexing signals using the direct-conversion topology. The voltage gain of the filter can be controlled from 9 to 43 dB in the 1-dB gain steps. The filter achieves a 7.8-nVradicHz input-referred noise density, a -8-dBV out-of-band third-order intermodulation intercept point, and a +15-dBV out-of-band second-order intermodulation intercept point. The circuit uses a 1.2-V supply and has been fabricated in a modern 65-nm CMOS technology.

54 citations

Journal ArticleDOI
TL;DR: Two new current-mode universal filters are presented that use unity gain current and voltage followers and can simultaneously realise lowpass, highpass and bandpass responses without any changes in the circuit topology.
Abstract: Two new current-mode universal filters are presented. The proposed filters use unity gain current and voltage followers. The first filter has three inputs and one output and can realise lowpass, highpass and bandpass responses without any changes in the circuit topology. Realisation of notch and allpass responses can be easily achieved without adding any additional active elements. The second filter has three inputs and one output and can simultaneously realise lowpass, highpass and bandpass responses without any changes in the circuit topology. Realisation of notch and allpass responses can be easily achieved without adding any additional active elements. The proposed circuits enjoy low active and passive sensitivities.

54 citations


Network Information
Related Topics (5)
Capacitor
166.6K papers, 1.4M citations
86% related
Amplifier
163.9K papers, 1.3M citations
85% related
Voltage
296.3K papers, 1.7M citations
84% related
CMOS
81.3K papers, 1.1M citations
83% related
Integrated circuit
82.7K papers, 1M citations
82% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20239
202229
20201
20188
2017150
2016199