DVCCCTA-Based Implementation of Mutually Coupled Circuit

This paper presents implementation of mutually coupled circuit using differential voltage current-controlled conveyor transconductance amplifier (DVCCCTA). It employs only two DVCCCTAs, one grounded resistor, and two grounded capacitors. The primary, secondary, and mutual inductances of the circuit can be independently controlled and tuned electronically. The effect of non-ideal behaviour of DVCCCTA on the proposed circuit is analyzed. The functionality of the proposed circuit is verified through SPICE simulation using 0.25？μm TSMC CMOS technology parameters. 1. Introduction Since the beginning of current-mode circuit concept, a lot of research has been directed towards the development of active inductance and immittance simulator circuits. A limited literature is available on active realizations (simulators) of mutually coupled circuit (MCC). The MCC is characterized by primary inductance, secondary inductance, mutual inductance, and the coupling factor. The MCC simulators can be integrated easily and have reduced possibility of magnetic interference due to absence of inductive components. Also, there exists a possibility of tunability of inductance values along with the coupling coefficient. Considering this, some MCC simulators have recently been reported in literature that uses different active building blocks [1–8]. The study of MCC simulators [1–8] shows that the circuits reported in [1, 2, 7] are based on operational transconductance amplifier (OTA), [2–4] that uses second-generation current conveyors (CCII), [5, 6] employ second-generation current-controlled conveyors (CCCII), [7] uses differential voltage current conveyors (DVCC) and CCIIs, [8] and utilizes current-controlled current backward transconductance amplifier (CC-CBTA). Some of these implementations [1–7] realize grounded MCC whereas a floating MCC realization is reported in [8]. The OTA-based MCC [1, 2] employs eight OTAs and two grounded capacitors. The CCII-based structures [2–4] use four to eight active elements, four to six resistors, and two to four capacitors. The CCCII-based MCC [5] employs four CCCIIs, five resistors, and two capacitors [5]. Reference [6] reports another CCCII-based MCC that uses five CCCIIs, two capacitors, and an inductor. Two circuits are reported in [7], the first circuit uses four OTAs, two resistors, and two capacitors whereas the second circuit makes use of two DVCCs; two CCIIs, six resistors, and two capacitors. The recently reported MCC [8] uses three CC-CBTAs and three capacitors. The circuits reported in [1, 5–8] are electronically tunable MCC