A Method for Realizing the Negative-Impedance Inverter

Su, Kendall L.

doi:10.1109/jssc.1967.1049776

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…If such a capacitance is sequentially added to a positive capacitance C n , then the resulting inverse capacitance C −1 = C −1 a + C −1 n can be made zero and then negative by tuning C n . The same effect is obtained via a negative inductance [18] added in parallel to a normal one. As the negative inductance/capacitance emulators are widely appplied in compensation of parasitic processes and for improving the radiation pattern in antennas, [16,17,18] they can serve to test our predictions.…”

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confidence: 65%

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Minimal-work principle and its limits for classical systems

Allahverdyan

Nieuwenhuizen

2007

Phys. Rev. E

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The minimal-work principle asserts that work done on a thermally isolated equilibrium system is minimal for the slowest (adiabatic) realization of a given process. This principle, one of the formulations of the second law, is operationally well defined for any finite (few particle) Hamiltonian system. Within classical Hamiltonian mechanics, we show that the principle is valid for a system of which the observable of work is an ergodic function. For nonergodic systems the principle may or may not hold, depending on additional conditions. Examples displaying the limits of the principle are presented and their direct experimental realizations are discussed.

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mentioning

confidence: 65%

“…The same effect is obtained via a negative inductance [18] added in parallel to a normal one. As the negative inductance/capacitance emulators are widely appplied in compensation of parasitic processes and for improving the radiation pattern in antennas, [16,17,18] they can serve to test our predictions.…”

mentioning

confidence: 65%

Minimal-work principle and its limits for classical systems

Allahverdyan

Nieuwenhuizen

2007

Phys. Rev. E

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“…In all these works, the NFCs were realized using traditional transistor circuit which rather increases the complexity of the PA circuit and makes realization difficult. On the other hand, a simple negative resistance network can be used to realize an NII . In this paper, graphene RTD is proposed for the implementation of the NII which provides the negative capacitance required to enhance the efficiency, output power, gain, and bandwidth of the Class‐J PA.…”

Section: Introductionmentioning

confidence: 99%

High‐power broadband graphene non‐Foster circuit enabled class‐J GaN HEMT power amplifier

Akwuruoha

2018

Micro & Optical Tech Letters

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This paper presents high-power broadband graphene non-Foster circuit (NFC) enabled Class-J GaN HEMT power amplifier (PA). A graphene resonant-tunneling diode (RTD) NFC is proposed to provide negative differential resistance characteristics and to create an effective negative capacitance. The NFC is integrated in the input matching network of the Class-J GaN HEMT PA to cancel out the transistor input parasitic capacitance so as to enhance PA bandwidth, efficiency, output power, and gain. The PA design is based on Cree's packaged GaN HEMT CGHV40030F biased with drain supply voltage of 50 V at quiescent drain-to-source current of 44 mA. The PA operates from 3.4 to 4.0 GHz with center frequency of 3.7 GHz. The effective negative capacitance of the NFC from 3.4 to 4.0 GHz stands at −3.3 to −6.0 pF. An effective capacitance of −3.7 pF has been obtained at 3.7 GHz. The PA has small signal gain of 16.1 dB at 3.7 GHz. Large signal simulation input power sweep from 1 to 33 dBm at 3.7 GHz, indicates that the PA has 57.8% drain efficiency, 54.7% power added efficiency (PAE), 44.6 dBm (28.8 W) output power and 11.6 dB transducer power gain at input power of 33 dBm. K E Y W O R D S broadband, class-J, GaN HEMT power amplifier, graphene non-Foster circuit, high power

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“…A NII circuit has been presented in Ref. . The interest in non‐Foster circuits (NFCs) realizing Non‐foster elements primarily stems from their applications in matching networks of antennas, transmission lines, and waveguides because they are beyond the Bode–Fano limit described in Ref.…”

Section: Introductionmentioning

confidence: 99%

Realizing wideband negative inductor using current feedback amplifier

Xia

Zhu

2016

Microw. Opt. Technol. Lett.

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Firstly, a compact current feedback amplifier‐based negative impedance converter (CFA‐based NIC) was designed and its equivalent circuit was proposed. Secondly, to obtain a stable negative inductor, a stabilization network was developed and combined with the CFA‐based NIC. Meanwhile, the stability of the combined circuit was analyzed in detail in the time domain by the method of Routh–Hurwitz criterion (R–H criterion). Finally, the prototype of the designed CFA‐based NIC with stabilization network was fabricated. The measurement results had a good agreement with simulated results. The measurement results showed the negative inductivity of the input impedance over a wideband from 50 to 500 MHz. Especially, the equivalent inductor of the present circuit is −3.4 nH ± 10% from 200 to 500 MHz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1723–1728, 2016

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A Method for Realizing the Negative-Impedance Inverter

Cited by 10 publications

References 14 publications

Minimal-work principle and its limits for classical systems

Minimal-work principle and its limits for classical systems

High‐power broadband graphene non‐Foster circuit enabled class‐J GaN HEMT power amplifier

Realizing wideband negative inductor using current feedback amplifier

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