Synthetic Grounded Lossy Inductance Simulators Using Single VDIBA

ABSTRACT

This work describes two circuit realizations for actively variable simulated lossy inductors (series R–L type and parallel R–L type). Both of the described inductors are simple and resistor-less structures, since they contains only a single active device called voltage differencing inverting buffered amplifier (VDIBA), one grounded capacitor, and one NMOS transistor as a voltage-controlled resistor. The simulated equivalent resistances and inductances of the proposed synthetic lossy inductors can be tuned electronically. The non-ideal transfer gain and the parasitic impedances existing at the VDIBA terminals are taken into account. Simulations with TSMC 0.25-µm CMOS technology are also provided, which demonstrate the utility as well as the workability of the proposed simulators.

KEYWORDS:

• Active filters
• Analogue integrated circuits
• Immittance function
• Inductance simulator
• RL impedance
• Tunable circuits and devices
• Voltage differencing inverting buffered amplifier (VDIBA)

ACKNOWLEDGEMENT

This work was supported by King Mongkut's Institute of Technology Ladkrabang (KMITL). The author gratefully acknowledges the constructive comments and suggestions of all the anonymous reviewers, which have been very useful in the preparation of the revised version of the manuscript.

Additional information

Notes on contributors

Worapong Tangsrirat

Worapong Tangsrirat was born in Uthaithani, Thailand, in 1968. He received the B.Ind.Tech. degree (Honors) in electronics engineering, and M.Eng. and D.Eng. degrees in electrical engineering all from Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok, Thailand, in 1991, 1997, and 2003, respectively. Since 1995, he has been a faculty member at KMITL, where he is currently an associate professor in the Department of Instrumentation and Control Engineering. His research interests are mainly in analogue signal processing and integrated circuits, current-mode circuits, and active filter and oscillator design.

E-mail: [email protected].