Design and Simulation of Voltage-controlled Oscillator with Minimum Transistors

Abstract

    A voltage-controlled oscillator is an oscillator whose output frequency can be changed by varying an input voltage. A voltage-controlled oscillator is an important part of the frequency synthesizer used in most telecommunication transceivers. In the design of VCO(voltage-controlled oscillator), we try to study its nonlinear effects (transient effects) and its effect on phase noise. The phase noise relationship of between the oscillator harmonics and the transfer functions should be investigated and then the phase noise can be improved by eliminating and controlling them. To eliminate these nonlinear effects, filters can be used to eliminate the harmonics and reduce the amplitude and bandwidth of the transmission function to help linearize the circuit and reduce phase noise. The purpose of this paper is to reduce phase noise and power consumption while increasing to gain. The circuit design of the circuit of the ADS(Advanced Design System) software is designed with 0.18μMm technology.