Patent ID: 7847650

Claim:
A quadrature oscillator comprising: a first differential oscillator comprising a first LC resonator and a first cross-coupled pair with a first merged node; a second differential oscillator comprising a second LC resonator and a second cross-coupled pair with a second merged node; a third LC resonator connecting between said first merged node and said second merged node, wherein said third LC resonator is comprised of a first inductor with a first terminal and a second terminal, said first terminal is connected to said first merged node and said second terminal is connected to said second merged node; a second inductor having a third terminal and a fourth terminal, wherein said third terminal is connected to a center-tap of said first inductor, and said fourth terminal is connected to a ground or a voltage source; a third cross-coupled pair and a third merged node within said first differential oscillator; a fourth cross-coupled pair and a fourth merged node within said second differential oscillator; a fourth LC resonator connecting between said third merged node and said fourth merged node, wherein said fourth LC resonator is comprised of a third inductor with a fifth terminal and sixth terminal, said fifth terminal is connected to said third merged node and said sixth terminal is connected to said fourth merged node; and a fourth inductor with a seventh terminal and a eighth terminal, wherein said seventh terminal is connected to a center-tap of said third inductor, and said eighth terminal is connected to ground or a voltage source.