ROMJIST Volume 26, No. 1, 2023, pp. 65-77, DOI: 10.59277/ROMJIST.2023.1.05
Koushick MATHUR, Palaniandavar VENKATESWARAN, Rabindranath NANDI Linear Voltage Controlled Oscillator Implementation in Electronically Variable Immittances
ABSTRACT: New realization schemes of electronically tunable inductor (L) and Frequency-Dependent Negative Resistance (D) type immittances using a Current Feedback Amplifier (CFA) and Multiplication Mode Current Conveyor (MMCC) composite active building block (ABB) are proposed. Applications of the immittances to the design of selective filters and LC-type linear voltage controlled quadrature oscillator (LVCQO) are presented. Experimental results based on PSPICE simulation and hardware design for a linear range of oscillation frequency (fo ~ 13.6MHz) with satisfactory phase-noise figure on the oscillator wave response had been verified. Effects of the Active Building Block (ABB)-nodal imperfections are analyzed to be insignificant. The new ideas in this article are two types of immittance functions realizable in the same topology; appropriate frequency-domain selective responses are also presented with experimentation results. KEYWORDS: Current Feedback Amplifier (CFA); linear voltage control oscillator; quadrature; selective filter; synthetic inductor/FDNRRead full text (pdf)