Electronically Tunable Mixed-mode Sinusoidal Oscillator using Simple Transconductors

This paper offers a tunable mixed-mode oscillator. Only two grounded capacitors and three transconductors are used in the oscillator. It has the advantageous characteristics of a simple structure, mixed voltage- and current-mode operation, and suitable IC implementation because of no external passive resistor and the use of a grounded capacitor. Furthermore, the oscillation frequency and condition can be separately changed by varying the bias current of the transconductors. The investigation of the effect of parasitic elements of transconductors on the proposed oscillator is included. The simulation results of the suggested circuit using PSPICE with 0.18 µm CMOS TSMC technology and ±0.75 V power supply confirm the analytical theory.