DVCC BASED CURRENT-MODE FIRST ORDER ALL-PASS FILTER AND QUADRATURE OSCILLATOR

Year 2007, Volume: 8 Issue: 1, 1 - 5, 05.08.2016

FIRAT Kaçar MAHMUT Ün

Abstract

A current mode first-order all-pass filter configuration is proposed. The presented circuit uses a single differential voltage current conveyor (DVCC), a capacitor and resistors. High output impedance of the proposed filter enables the circuit to be cascaded without additional buffers. To demonstrate the performance of the proposed filter a new current mode quadrature oscillator is given as an application example. Oscillator is implemented through the proposed first order all-pass filter and integrator as the building blocks. Furthemore the effects of tracking errors of the DVCC on oscillation condition and frequency are investigated. The theoretical results are verified with PSPICE simulations using a new CMOS realization of DVCC.

Keywords

All-pass filter, differential voltage current conveyor, quadrature oscillator, analog integrated circuits.

References

• Toumazou, C., Lidjey, and Haigh, D., Analog IC Design: The current-mode approach. Peter Peregrinus, UK, 1990.
• Palmisano, G., Palumbo, G., and Pennisi, S., CMOS Current Amplifiers. Kluwer Academic Publishers, 1999.
• Mucha, I., Current operational amplifiers: Basic architectures, properties, exploitation and future, Analog Integrated Circuits and Signal Processing, vol. 7, pp. 243-255, 1995.
• Awad, I., and Soliman, A. M., Current operational amplifiers: CMOS realization and active compensation, Analog Integrated Circuits and Signal Processing, vol. 24, pp. 141-152, 2000.
• Ozoguz, S., Toker, A., and Acar, C., Current mode continous-time fully-integrated universal using CDBA, Electronics Letters, vol. 35, pp.97-98, 1999.
• Schauman, R., Valkenburg, M. E., Design of analog filters. Oxford University Press, New York, 2001.
• Chang, C. M., Current-mode allpass/notch and band pass filter using gingle CCII, Electron Letters Vol. 27, pp. 1614-1617, 1991.
• Lui, S., Hwang, C. S., Realization of current-mode filters using single FTFN Int. Journal of Electronics, Vol. 82, pp.499-502, 1997
• Higashimura, M., Fukai, Y., Realization of all-pass and notch filters using a single current conveyor, Int. Journal of Electronics, Vol.65, pp. 823-828, 1988.
• Higashimura, M., Current-mode allpass filter using FTFN with grounded capacitor, Electron Letters Vol. 27, pp. 1182-1183, 1991.
• Çam, U., Cicekoglu, O., Gulsoy, M., Kuntman, H., New voltage and current mode first-order all-pass filters using single FTFN, Frequenz, Vol.7-8, pp. 177-179, 2000.
• Toker, A., Ozoguz, S., Cicekoglu, O., Acar, C., Current mode all-pass filters using current differencing buffered amplifier and new high-Q band-pass filter configuration, IEEE Transaction on Circuits and Systems-II, Vol. 47, pp. 949-954, 2000.
• Kılınc, S., Cam, U., Current-mode first order allpass filter employing single current operational amplifier, Analog Integrated Circuits and Signal Processing, vol. 41, pp. 47-53, 2004.
• Pal, K., Realization of current conveyor all-pass network, Int J Electron, Vol: 50(2), pp.165-168, 1981.
• Elvan H. O. And Soliman A. M.,Novel CMOS differential voltage-current conveyor and its application, IEE Proc. Circuits Devices Syst., Vo:144(3), pp. 195-200, 1997.
• Ahmed MT, Khan IA, Minhaj N, On Transconductance-C quadrature oscillators. J Franklin Ins. 336, 735-746, 1999.