Current-controlled current-mode multiphase oscillator using CCCDTAs

This paper presents a new current-controlled current-mode multiphase sinusoidal oscillator using current controlled current differencing transconductance amplifiers (CCCDTAs). The proposed oscillator circuit, which employs one CCCDTA, one grounded capacitor and one MOS resistor for each phase, can generate arbitrary n output current equal-amplitude signals that are equally spaced in phase (n being even or odd), all at high output impedance terminals. The frequency of oscillation and the condition of oscillation can be controlled electronically and independently through adjusting the bias currents of the CCCDTAs. The proposed multiphase oscillator is highly suitable for integrated circuit implementation. The theoretical results were verified by PSPICE simulation.