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Negative impedance converter

About: Negative impedance converter is a research topic. Over the lifetime, 5801 publications have been published within this topic receiving 87636 citations.


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Patent
Duane C. Johnson1
21 Dec 2001
TL;DR: In this paper, a method and apparatus for substantially eliminating ripple and transient voltage using a current controlled voltage regulator is presented, where current control senses load current (i L ) changes and produces control voltage (V CONTROL ) in response to the load current changes.
Abstract: A method and apparatus for substantially eliminating ripple and transient voltage using a current controlled voltage regulator. Current control ( 460 ) senses load current (i L ) changes and produces control voltage (V CONTROL ) in response to the load current changes. The control voltage increases the conductivity state of shunt transistor ( 470 ) such that any deficit of current caused by load changes at load ( 420 ) during a positive voltage transient is conducted through shunt transistor ( 470 ). The control voltage decreases the conductivity state of shunt transistor ( 470 ) such that any excessive current caused by load ( 420 ) during a negative voltage transient is balanced by the reduction of current in shunt transistor ( 470 ).

37 citations

Patent
01 Aug 1997
TL;DR: In this article, the authors present an electronic watt-hour meter consisting of a voltage sensor, a current sensor and a conversion circuit, and a phase correction circuit, which inserts a power factor compensation technique that inserts a delay into the digitized current or voltage sample stream.
Abstract: A watt-hour meter employs a power factor compensation technique that inserts a delay into the digitized current or voltage sample stream. An exemplary embodiment of the present invention includes an electronic watt-hour meter comprising a voltage sensor, a current sensor, a conversion circuit, and a processing circuit: The voltage sensor generates a voltage measurement signal responsive to a voltage provided to a load. Similarly, the current sensor generates a current measurement signal responsive to a current provided to a load. The conversion circuit further comprises: a first converter connected to the voltage sensor for generating sampled voltage data stream based on said voltage measurement signal; a second converter connected to the current sensor for generating a sampled current data stream based on said current measurement signal, and a phase correction circuit. The phase correction circuit is connected to one of the first and second converters and inserts a delay into one of the sampled voltage data stream or the sampled current data stream. The processing circuit is operably connected to the first and second converters, and receives information indicative of the sampled voltage data stream and sampled current data stream subject to any delay inserted by the phase correction circuit. The processing circuit then generates power consumption data from the sampled voltage data and sampled current data.

37 citations

Journal ArticleDOI
TL;DR: In this article, a novel family of single-switch resonant dc-dc converters with low switch voltage stress is presented, which has a ground-referenced switch and operates at several-MHz switching frequency.
Abstract: This paper presents a novel family of single-switch resonant dc-dc converters with low switch voltage stress. The single-switch resonant converter which has a ground-referenced switch is advantageous for implementing the gate drive circuit and operating at several-MHz switching frequency. However, the conventional ones mostly have high voltage stress on the switch, roughly 4-5 times the input voltage. In this paper, we propose the single-switch converter topologies derived from the drain-source impedance networks consisting of two inductors and two capacitors. The switch voltage of the proposed converters is shaped into a near trapezoid by designing the resonant networks to have the desired drain-source impedance. Furthermore, a simple and specific design scheme is presented here so that the peak switch voltage is lowered to 2.2-2.5 times the input voltage while zero voltage switching is achieved. Experimental results from a 20-W GaN-based prototype operating at 10 MHz demonstrate the feasibility of the proposed converter topologies and the design method.

37 citations

Patent
23 Mar 2007
TL;DR: In this article, a data converter logic circuit coupled with the regulator and the LED voltage monitoring circuit is proposed to adjust the current based on the voltage reading signal of the voltage drop.
Abstract: Described herein is technology for, among other things, a circuit for controlling a current through an LED. The novel circuit includes a regulator for providing the current to the LED, an LED voltage monitoring circuit for monitoring a voltage drop across the LED and for providing a voltage reading signal based on the voltage drop. The novel circuit further includes a data converter logic circuit coupled with the regulator and the LED voltage monitoring circuit. The data converter logic circuit is operable to control the regulator to adjust the current based on the signal.

37 citations

Journal ArticleDOI
TL;DR: In this paper, the negative-capacitance transient effect in a ferroelectric HfZrO2 (FE-HZO) capacitor and an equivalent circuit model based on the Landau-Khalatnikov (LK) theory was developed.
Abstract: We have experimentally observed the negative-capacitance transient effect in a ferroelectric HfZrO2 (FE-HZO) capacitor and developed an equivalent circuit model based on the Landau–Khalatnikov (LK) theory. By considering multiple domains (MD) and domain interaction, an MD-LK model precisely reproduced the experimental dynamic characteristics in an FE-HZO capacitor with the various input voltage amplitude and external resistance. The MD-LK model was successfully validated as a dynamic model for FE-HZO capacitor. The MD-LK model is highly expected as a useful simulation model for the dynamic NCFET with a multi-domain FE-HZO gate insulator.

37 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202330
2022104
2021120
2020131
2019134
2018155