Analysis, Design and Realization of Negative Impedance Converter Circuit with Current Feedback Operational Amplifier

Analysis, Design and Realization of Negative Impedance Converter Circuit with Current Feedback Operational Amplifier

Автор: Sami Durukan, Asim Egemen Yilmaz, Mahmut Keser

Журнал: International Journal of Wireless and Microwave Technologies @ijwmt

Статья в выпуске: 2 Vol.12, 2022 года.

Бесплатный доступ

Negative impedance converter (NIC) circuits are very interesting and beneficial building blocks with the capability of generating negative resistance, capacitance and/or inductance elements which do not exist as a singular electrical component in practice. They are commonly used for the impedance matching and parasitic element cancellation in electrically small antennas and amplifier circuits. In this study, a special kind of NIC circuit in HF band up to 30 MHz is analysed, designed and physically realised with a current feedback (CFB) operational amplifier (OPAMP) which is the core active element of the NIC circuit. The non-inverting terminal of CFB OPAMP is used for RF input signal with the elimination of DC offset voltage in the proposed NIC circuit. The negative impedance conversion capability of the circuit is theoretically proved and simulated first. This capability of CFB OPAMP to generate negative impedance is very important in high-frequency applications as they have low distortion and faster switching than that of voltage feedback (VFB) OPAMP. For the physical realizations, printed circuit board (PCB) is designed and manufactured on FR-4 dielectric material. Measurement results obtained from the realized circuit with resistive (100Ω) and capacitive (10pF) loads to be converted negatively showed that the negative impedance conversion performance of the circuit is very close to its theoretical behaviour in the lower HF frequencies generally in 3- 20 MHz band.

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Negative Impedance Converter, Non-Foster Circuit, Matching, Current Feedback OPAMP

Короткий адрес: https://sciup.org/15018388

IDR: 15018388   |   DOI: 10.5815/ijwmt.2022.02.01

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