Patent ID: 9742353
Date: 2017-08-22
CPC Classifications: H03B,H04B

Claim:
1. A circuit for an oscillator with common-mode resonance, the circuit comprising: a first oscillator circuit comprising a first cross-coupled transistor pair including a first transistor and a second transistor, a gate node of the first transistor directly connected to a drain node of the second transistor and a gate node of the second transistor directly connected to a drain node of the first transistor, wherein the first transistor and the second transistor are NMOS transistors; and a second oscillator circuit comprising a second cross-coupled transistor pair including a third transistor and a fourth transistor, a gate node of the third transistor directly connected to a drain node of the fourth transistor and a gate node of the fourth transistor directly connected to a drain node of the third transistor, the second cross-coupled transistor pair being coupled to the first oscillator circuit via a joint tank circuit, wherein the third transistor and the fourth transistor are PMOS transistors, wherein the joint tank circuit comprises: wherein each of the first oscillator circuit and the second oscillator circuit is configured to allow tuning of a respective common mode resonance frequency (F CM ) to be at twice a respective differential resonance frequency (F D ) by adjusting a ratio of capacitance values of the pair of the first and second capacitors.