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Electronic filter

About: Electronic filter is a research topic. Over the lifetime, 13207 publications have been published within this topic receiving 93063 citations. The topic is also known as: filter.


Papers
More filters
Journal ArticleDOI
TL;DR: This paper describes a fully monolithic phase-locked loop (PLL) frequency synthesizer circuit implemented in a standard 0.8-/spl mu/m CMOS technology to be immune to noise, all the circuits in the synthesizer use differential schemes with the digital parts designed by static logic.
Abstract: This paper describes a fully monolithic phase-locked loop (PLL) frequency synthesizer circuit implemented in a standard 0.8-/spl mu/m CMOS technology. To be immune to noise, all the circuits in the synthesizer use differential schemes with the digital parts designed by static logic. The experimental voltage controlled oscillator (VCO) has a center frequency of 800 MHz and a tuning range of /spl plusmn/25%. The measured frequency synthesizer performance has a frequency range from 700 MHz to 1 GHz with -80 dBc/Hz phase noise at a 100 kHz carrier offset. With an active area of 0.34 mm/sup 2/, the test chip consumes 125 mW at maximum frequency from a 5 V supply. The only external components are the supply decoupling capacitors and a passive filter.

37 citations

Journal ArticleDOI
TL;DR: A new universal biquadratic filter configuration using two current-feedback amplifiers (CFAs) is presented and can realize all the standard filter functions, that is, highpass, bandpass, lowpass, notch, and allpass filters, without changing the passive elements.
Abstract: A new universal biquadratic filter configuration using two current-feedback amplifiers (CFAs) is presented. The circuit has three inputs and one low-impedance output and can realize all the standard filter functions, that is, highpass, bandpass, lowpass, notch, and allpass filters, without changing the passive elements. The proposed circuit has no requirements for component matching conditions and uses only four passive components. The center frequency and bandwidth can be orthogonally controllable. Also, the active and passive sensitivities are low.

37 citations

Patent
20 May 1981
TL;DR: In this paper, a system for monitoring the capacitor batteries of a three-phase filter circuit is described, where the magnitude and phase of the fundamental frequency component of the current flowing from the Y-circuit node to the reference potential is monitored, variations therein being evaluated to identify defective sectional capacitors.
Abstract: A system for monitoring the capacitor batteries of a three-phase filter circuit. Each capacitor battery is formed of a plurality of parallel legs each having a plurality of sectional capacitors which are connected in series with fuses. Adjacent ones of the sectional capacitors are coupled to one another. In a three-phase system, three capacitor batteries are coupled to one another in a Y-circuit configuration, the Y-circuit node being coupled to a reference potential, illustratively ground. The magnitude and phase of the fundamental frequency component of the current flowing from the Y-circuit node to the reference potential is monitored, variations therein being evaluated to identify defective sectional capacitors. Only variations in the Y-circuit node current which occur rapidly will trigger fault signals, thereby preventing false indications resulting from variations in temperature.

37 citations

01 Jan 2007
TL;DR: In this paper, a hybrid series active filter (HSAF) is proposed for compensating voltage/current harmonic, type of loads, reactive power and damping of resonant.
Abstract: This paper presents a new Hybrid Series Active Filter (HSAF) for compensating voltage/current harmonic, type of loads, reactive power and damping of resonant. It is a combined system of Shunt Passive Filter (SPF) and a Series Active Filter (SAF). The integration of passive and active power filters is very important for reducing power rating of the active part. The novel SPF uses minimum component count. The principle of the SPF is to provide a high impedance at the fundamental frequency and a very low-impedance higher harmonics generated by the load, thus compensating effectively all harmonics and reactive power to improve power factor. The SAF presents high impedance during harmonics compensation what forces the harmonics to flow through the SPF and compensates the voltage harmonic and the reactive power. The control of the SAF is based on Synchronous Reference Frame (SFR) method. The simulation results are discussed, and the performance of the topology is therefore evaluated.

37 citations

Patent
Akira Takayama1
18 Nov 1994
TL;DR: In this paper, a double-conversion TV tuner exhibiting low diode insertion loss is described, in which intermodulation distortion does not occur even when an incoming signal has a large amplitude.
Abstract: The invention provides a filter circuit for use in a double-conversion TV tuner exhibiting low diode insertion loss, in which intermodulation distortion does not occur even when an incoming signal has a large amplitude. In the filter circuit according to one preferred embodiment of the invention, there are provided three bandpass filters (BPFs) which allow corresponding RF signals in different frequency bands to pass through them, and six variable attenuation diodes whose impedance is controlled by an AGC voltage applied to an AGC terminal (16). There are also provided switching diodes (20) disposed between an input terminal (1) and the inputs of three BPFs so that the switching diodes (20) select exclusively one of three BPFs so as to apply an RF signal received at the input terminal (1) only to the selected BPF (it will be assumed hereinbelow that the BPF (21) is selected). In this arrangement, not only the impedance of variable attenuation diodes (22, 23) in the selected BPF (21) which provides the extracted RF signal, but the impedance associated with all variable attenuation diodes is controlled by the AGC voltage.

37 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202237
2021138
2020362
2019517
2018554