Resistorless Current-mode Quadrature Oscillator with Grounded Capacitors

This paper presents a new Current Differencing Transconductance Amplifiers (CDTA)based resistorless current-mode Quadrature Oscillator (QO). The proposed QO consist of two CDTAs and two grounded capacitors, and it is completely resistorless, which are suitable for monolithic integration. The QO can provide two explicit quadrature outputs at high impedance terminals, which are convenient for cascade. The oscillation frequency of the QO can be tuned from 46.63 MHz to 54.72 MHz by changing the control voltage, and the phase noise of the QO is –89.81dBc/Hz at 1 MHz offset. Moreover, all the active and passive sensitivities are low.