This paper presents a new current-mode third-order quadrature oscillator. The proposed circuit, which uses one current-controlled current differencing transconductance amplifier (CCCDTA), one operational transconductance amplifier (OTA) and three grounded capacitors, can generate two quadrature voltage outputs and two quadrature current outputs. The oscillation condition and the oscillation frequency can be controlled orthogonally and electronically by adjusting the bias currents of the CCCDTA and OTA. The use of only grounded capacitor makes the proposed circuit ideal for integrated circuit implementation. Simulation results verifying the theoretical analysis are also included.
This paper presents a voltage-mode allpass section employing only one differential difference current conveyor transconductance amplifier (DDCCTA) and one capacitor. The pole frequency of the filter can be controlled electronically by the transconductance value via adjusting the bias current of the DDCCTA. For realize filtering function, no component-matching conditions are needed. Simulation results using TSMC 0.35 m CMOS process are performed to examine the proposed circuit. From simulation results, the proposed filter offers agree well with the proposed theory.
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