Stability Analysis and Design of Negative Impedance Converters: Application to Circuit and Small Antennas

Ugarte-Munoz, E.; Jiménez-Martín, José Luis; Segovia-Vargas, Daniel; González-Posadas, V.; Parra-Cerrada, Ángel; Albarracin-Vargas, Fernando

doi:10.13164/re.2016.0409

Cited by 2 publications

(2 citation statements)

References 28 publications

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“…For instance, if the NIC is negating a load resistor R L then a stabilizing input resistance R in is required so that the net resistance remains positive R net = R in − R L > 0. The necessary conditions for NIC stability has been extensively studied in [10,18], which are mainly based on the Nyquist stability criterion to ensure the network function does not have any poles in the right hand side of the s-plane. Without exception, the proposed NIC requires a stabilizing input element.…”

Section: A Negative Impedance Converter Designmentioning

confidence: 99%

Demonstration of Negative Impedance Conversion for Bandwidth Extension in VLC

Kassem

Darwazeh

2020

2020 IEEE International Symposium on Circuits and Systems (ISCAS)

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This work proposes and demonstrates the utility of a negative impedance converter (NIC) circuit, based on a common collector (CC) amplifier, for the generation of negative capacitance. The design principle of the proposed NIC is introduced, then a negative capacitance equals −200 pF is demonstrated using discrete devices constructed on a printed circuit board (PCB). The designed NIC is applied for the bandwidth extension of LEDs to enhance the achievable data rates in visible light communication (VLC) systems. The paper includes analytical derivations of the obtained negative capacitance as a function of circuit parameters and verifies this by both simulation and experimentally. Measurements show significant bandwidth extension by neutralising the bandwidth-limiting effect of the LED diffusion capacitance through the introduction of a parallel negative capacitance.

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Section: A Negative Impedance Converter Designmentioning

confidence: 99%

Demonstration of Negative Impedance Conversion for Bandwidth Extension in VLC

Kassem

Darwazeh

2020

2020 IEEE International Symposium on Circuits and Systems (ISCAS)

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“…국내 에서도 비-포스터 회로를 소형 안테나에 적용한 연구 결 과물들이 있으나, 주로 임피던스 정합 대역폭이 확장되는 결과값만을 제시하는데 그쳤으며 [9] , 이를 통해 안테나의 수신전력 개선비를 분석한 연구 사례는 드물다. 또, 능동 소자를 사용하는 비-포스터 정합회로 설계에 있어 발진 가능성을 회피하기 위한 회로 안정도 검증이 꼭 필요함에 도 불구하고 [10]～ [12] , 이를 간과하거나 확실하지 않은 방법 으로 검증하는 경우가 많다. [13] .…”

Section: ⅰ 서 론unclassified

Non-Foster Circuit Design for Broadband Matching and Receiver Power Enhancement of Electrically Small Antennas

Lee¹,

Chung²

2019

J. Korean Inst. Electromagn. Eng. Sci.

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In this paper, we describe the design, fabrication, and measurement results of a non-Foster circuit for improving the wideband matching and receiver power of small antennas. The antennas under consideration are a small monopole antenna and a small inverted F antenna. These antennas experience excessive C and L respectively; which makes it difficult to match their wideband impedance performance. To cancel out the excess C, a negative C non-Foster circuit is designed whereas a negative L non-Foster circuit is designed to cancel out the excess L. An important factor in the design of a non-Foster circuit is the stability, which is obtained by simultaneously considering the open circuit stability condition and transient response. According to the simulation, the optimized non-Foster circuit operates with negative C and L at 100～500 MHz, and it is fabricated with a PCB process and applied to the antennas. The reflection coefficients of the small monopole antenna and the inverted F antenna with non-Foster circuits are less than −10 dB at 150～400 MHz and 220～330 MHz, respectively. In addition, we measured the receiver power using antennas with non-Foster circuits. The small monopole antenna improved by 10.3 dB on average while the small inverted F antenna improved by 7.5 dB, at this frequency band.

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Stability Analysis and Design of Negative Impedance Converters: Application to Circuit and Small Antennas

Abstract: Abstract. Negative impedance converters (NICs

Cited by 2 publications

References 28 publications

Demonstration of Negative Impedance Conversion for Bandwidth Extension in VLC

Demonstration of Negative Impedance Conversion for Bandwidth Extension in VLC

Non-Foster Circuit Design for Broadband Matching and Receiver Power Enhancement of Electrically Small Antennas

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