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Artificial Voltage-Controlled Capacitance and Inductance using Voltage-Controlled Transconductance

Authors: Mansour I. Abbadi, Abdel-Rahman M. Jaradat


In this paper, a technique is proposed to implement an artificial voltage-controlled capacitance or inductance which can replace the well-known varactor diode in many applications. The technique is based on injecting the current of a voltage-controlled current source onto a fixed capacitor or inductor. Then, by controlling the transconductance of the current source by an external bias voltage, a voltage-controlled capacitive or inductive reactance is obtained. The proposed voltage-controlled reactance devices can be designed to work anywhere in the frequency spectrum. Practical circuits for the proposed voltage-controlled reactances are suggested and simulated.

Keywords: voltage-controlled capacitance, voltage-controlled inductance, varactor diode, variable transconductance.

Digital Object Identifier (DOI):

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[1] K. R. Thrower, "History of tuning," IEE International Conference on 100 Years of radio, September, 1995.
[2] L. J. Giacoletto, and J. O-Connel, "A variable capacitance germanium junction diode for UHF," RCA Review, vol. l7, March, 1956, pp. 68-85.
[3] B. Razavi, "Challenges in the design of frequency Synthesizers for Wireless Application," in Proc. IEEE ClCC -97, May, 1997, pp. 395-402.
[4] K. Stadius, R. Kaunisto, and V. Porra, "A High frequency harmonic VCO with an Artificial Varactor," in Proc. 5th ICECS -98, vol. 3, September, 1998, pp. 161-164.
[5] K. Stadius, R. Kaunisto, and V. Porra, "Varactor diodeless harmonic VCOs for GHz-range applications," Analog Integrated Circuits and Signal Processing, Vol. 27 , Issue 1-2, April/May 2001.
[6] W. Z. Chen, J. T. Wu, "A 2-V 2-GHz BJT variable frequency oscillator," IEEE JSSC, vol. 33, no. 9, 1998, pp. 1406-1410.