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Output impedance

About: Output impedance is a research topic. Over the lifetime, 11185 publications have been published within this topic receiving 134949 citations.


Papers
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Journal ArticleDOI
TL;DR: The proposed circuit offers the following features: realisation of lowpass, bandpass and highpass signals from the same configuration, no requirements for component matching conditions, orthogonal control of /spl omega//sub 0/ and Q, the use of grounded capacitors, low active and passive sensitivities and low output impedance.
Abstract: A new configuration for realising high input impedance lowpass, bandpass and highpass filters simultaneously by using three current-feedback amplifiers, three grounded capacitors, three grounded resistors and one floating resistor is presented. The proposed circuit offers the following features: realisation of lowpass, bandpass and highpass signals from the same configuration, no requirements for component matching conditions, orthogonal control of /spl omega//sub 0/ and Q, the use of grounded capacitors, low active and passive sensitivities and low output impedance.

46 citations

Journal ArticleDOI
Qizheng Gu1, Arthur S. Morris1
TL;DR: In this article, a direct calculation method for matching network adaptive control utilizing an analytic algorithm based on an integrated measurement of load impedance is presented, but in practice its operation is restricted by the matching network tolerances and the accuracy and dynamic range of the load impedance measurement circuitry.
Abstract: This paper presents a novel direct calculation method for matching network adaptive control utilizing an analytic algorithm based on an integrated measurement of load impedance. In principle, this approach has no limitations on the match tuned load impedance and the operating frequency, but in practice its operation is restricted by the matching network tolerances and the accuracy and dynamic range of the load impedance measurement circuitry. The matching network consisting of microelectromechanical systems tunable capacitors and high-Q fixed inductors is one of the best choices for this loop since it has a broad match tuning range across loads condition and frequencies.

46 citations

PatentDOI
TL;DR: In this paper, a bipolar and complementary metal oxide semiconductor (BICMOS) technology was used for a hearing aid system with bipolar and CMOS devices on the same silicon substrate, where the major part of the internal circuitry uses bipolar devices while the output circuit driving the transducer at the output uses CMOS inverters.
Abstract: An invention, which is fabricated using a Bipolar and Complementary Metal Oxide Semiconductor (BICMOS) technology which offers both bipolar and CMOS devices on the same silicon substrate is disclosed. The major part of the internal circuitry uses bipolar devices while the output circuit driving the transducer at the output uses CMOS inverters. A voltage regulator which is fed from the battery lines is used to power the majority of the internal circuitry leaving only the CMOS output driver and part of a level converter to be powered directly from the battery lines. This architecture guarantees that no signal is fed back to the previous stages of the hearing aid system through the battery lines, ensuring stable operation for an extended range of the battery internal impedance value. The bipolar front-end blocks of the circuit are designed using low-voltage bipolar design techniques to operate at the 1 volt level produced by the internal voltage regulator. The voltage regulator employs a bipolar base-emitter voltage reference, which ensures the tracking of its output voltage with the headroom requirements of the bipolar circuitry over the temperature and process variations.

45 citations

Journal ArticleDOI
TL;DR: In this article, the current sensitivity of the Solartron SI-1260 Impedance/Gain Phase Analyzer is improved by six orders of magnitude by the Keithley 428 Current Amplifier.

45 citations

Patent
30 Sep 1998
TL;DR: In this article, an impedance matcher for monitoring a condition of plasma of a plasma load to which power is supplied from a high frequency power source through a high-frequency power source provides with a first-input impedance calculator for calculating an impedance as a first input impedance from a supply-side terminal of the matcher to the plasma load-side based on voltage, current and phase difference detected at the supply side terminal.
Abstract: A plasma monitoring apparatus for monitoring a condition of plasma of a plasma load to which power is supplied from a high frequency power source through an impedance matcher provides with a first input impedance calculator for calculating an impedance as a first input impedance from a supply-side terminal of the matcher to the plasma load-side based on voltage, current and phase difference detected at the supply-side terminal of the matcher, a second input impedance calculator for calculating an impedance as a second input impedance from a load-side terminal of the matcher to the plasma load based on a impedance of a element of the matcher and the first input impedance and a plasma impedance calculator for calculating an impedance of the plasma load from the second input impedance and an impedance of a supply-side connecting the matcher and the plasma load.

45 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202347
2022140
2021182
2020285
2019366
2018377