Electronically tunable voltage-mode quadrature oscillators with four grounded passive elements using a single DDCCTA

Hua-Pin Chen and Wan-Shing Yang* Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City, Taiwan, R.O.C. 2 Department of Computer and Communication Engineering, De Lin Institute of Technology, New Taipei City, Taiwan, R.O.C. *E-mail: [email protected] Abstract In this study, two novel electronically tunable voltage-mode quadrature oscillators are proposed using only two grounded resistors and two grounded capacitors along with a single differential difference current conveyor transconductance amplifier (DDCCTA). The presented circuits provide three quadrature voltage signals with 90 phase difference. The oscillation condition and oscillation frequency of both proposed quadrature oscillators are independently controllable. The bias current of DDCCTA can provide electronic tunability to the oscillation frequency. The use of only grounded capacitors and resistors makes the proposed oscillators attractive for integrated circuit implementation. Both of the proposed oscillators enjoy low active and passive sensitivities. H-Simulation program with integrated circuit emphasis (H-Spice) simulations using Taiwan Semiconductor Manufacturing Company (TSMC) 0.18 μm complementary metal oxide semiconductor (CMOS) technology process parameters are given to validate theoretical predictions.