Patent ID: 9231568
Filing Date: 2016-01-05
CPC Classification: H03B,H03K

Claim Text:
1. A circuit for reducing phase noise of an oscillator, comprising: a transistor; an impedance element coupled to the transistor; an inverting circuit coupled to one end of the impedance element; and an add circuit coupled to the inverting circuit and the other end of the impedance element, wherein the signals from the two ends of the impedance element are superimposed and output to reduce the phase noise of the oscillator; wherein the impedance element and the inverting circuit are electrically connected to the gate of the transistor, and the impedance element and the add circuit are electrically connected to the drain of the transistor; wherein the transistor is a field effect transistor, and the impedance element is coupled to a drain and a gate of the field effect transistor, signals from the drain and the gate are inverted by the impedance element and the field effect transistor, the phase noise is kept in a same phase, and the phase noise is reduced by invert amplifying and superimposing the signals and the phase noise of the drain and the gate.