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ABSTRACT
A new electronically tunable allpass filter (ETAF) using a voltage variable inductor (VVI) is presented. The design is based on a composite CFA (Current Feedback Amplifier)–voltage tunable current conveyor transconductance amplifier (VTCCTA) analog building block (ABB). The phase (θ)-response of this first-order filter is tunable by the VVI, wherein signal-gain (K) is independently adjustable by a single resistor. Analytical estimate of phase-error (θe) caused by device parasitic capacitors is derived. Experimentation by PSPICE simulation and hardware set-up indicates a low θe (∼3°) with a gain of 10 dB at pole-frequency 12 MHz. Next a linear voltage controlled quadrature oscillator (LVCQO) is designed by cascading the ETAF to a voltage tuned integrator in looped-feedback configuration.
Additional information
Notes on contributors
Koushick Mathur
Koushick Mathur received the BE and MTech degrees, both from Burdwan University, in 2004 and 2007, respectively and PhD from Jadavpur University in 2020. He is currently assistant professor in Department of Electronics & Communication Engg., University Institute of Technology, Burdwan University, Burdwan, WB. His research interests include electronic communications and analog signal processing. Email: [email protected]
Rabindranath Nandi
Rabindranath Nandi is a senior professor and UGC-emeritus fellow at the department of Electronics & Telecommunication Engg. Dept., Jadavpur University, Kolkata. He served as the Head of the Department during 1999–2001. His research interest includes topics on analog/digital signal processing and computer communication. He served as visiting faculty in various universities abroad. He is a member of IEICE and senior member of IEEE.