Keysight Technologies, Inc.
Oscillator with one-port resonator

Abstract:

An oscillator generates a radio frequency (RF) output signal having high phase shift versus frequency characteristics close to a desired output frequency of the oscillator. The oscillator includes a resonator having a resonant frequency that is substantially the same as the desired output frequency of the oscillator, where the resonator provides a reflected signal; a resistor connected to one port of the resonator, another port of the resonator being connected to ground; an amplifier configured to receive the reflected signal from the resonator and to output an amplified reflected signal as the RF output signal; and a circulator having a first port connected to the resonator via the resistor, a second port connected to an input of the amplifier, and a third port connected to an output of the amplifier such that the amplified reflected signal is input back to the resonator.