A study on configuration of oscillator circuit for improving phase noise

The advancement of the communication technology in recent years demands the technology of the high frequency and low phase noise of oscillator required for mobile telecommunications. In general, there are two important things for improving the phase noise characteristics of the oscillator. One is a design that the phase noise in the amplifier is suppressed to low. The other is a design having loaded Q as greatly as possible. In this paper we discuss a configuration of oscillator circuit to obtain an extremely low phase noise and an oscillator operating at a non-reactive frequency of SAW resonator.