Unconditionally Stable Non-Foster Element Using Active Transversal-Filter-Based Negative Group Delay Circuit

TY - JOUR

T1 - Unconditionally Stable Non-Foster Element Using Active Transversal-Filter-Based Negative Group Delay Circuit

AU - Zhang, Tiedi

AU - Xu, Ruimin

AU - Wu, Chung Tse Michael

N1 - Publisher Copyright: © 2017 IEEE.

PY - 2017/10

Y1 - 2017/10

N2 - This letter introduces a novel type of non-Foster element using a microwave transversal-filter-based negative group delay (NGD) circuit that can exhibit unconditional stability. The proposed device is realized by a distributed amplifier, in which the NGD response is synthesized by adjusting the ratio of transconductance of transistors in each stage. On top of this, by properly amending the in-band magnitude and phase characteristics, the NGD circuit can realize non-Foster elements within the operating band. Furthermore, thanks to the distributed topology, the proposed network has very good input and output matching characteristics. As proof-of-concept, a prototype of the proposed non-Foster element is built to validate the proposed scheme. The experimental results show that the proposed circuit can realize a unilateral non-Foster element composed of a -1 pF shunt capacitor and a -1.25 nH series inductor.

AB - This letter introduces a novel type of non-Foster element using a microwave transversal-filter-based negative group delay (NGD) circuit that can exhibit unconditional stability. The proposed device is realized by a distributed amplifier, in which the NGD response is synthesized by adjusting the ratio of transconductance of transistors in each stage. On top of this, by properly amending the in-band magnitude and phase characteristics, the NGD circuit can realize non-Foster elements within the operating band. Furthermore, thanks to the distributed topology, the proposed network has very good input and output matching characteristics. As proof-of-concept, a prototype of the proposed non-Foster element is built to validate the proposed scheme. The experimental results show that the proposed circuit can realize a unilateral non-Foster element composed of a -1 pF shunt capacitor and a -1.25 nH series inductor.

KW - Distributed amplifier (DA)

KW - negative capacitance

KW - negative group delay (NGD)

KW - negative inductance

KW - non-Foster element

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U2 - https://doi.org/10.1109/LMWC.2017.2745487

DO - https://doi.org/10.1109/LMWC.2017.2745487

M3 - Article

VL - 27

SP - 921

EP - 923

JO - IEEE Microwave and Wireless Components Letters

JF - IEEE Microwave and Wireless Components Letters

SN - 1531-1309

IS - 10

M1 - 8031279

ER -