Patent ID: 8212592
Filing Date: 2012-07-03
Classification: H03B

Abstract:
1. A method comprising: coupling a first input voltage to a first oscillator, the first oscillator comprising a cross-coupled transistor pair, a load pair coupled to the drains of the cross-coupled transistor pair, an integrating capacitor coupled to the sources of the cross-coupled transistor pair, and a pair of current injection transistors having drains coupled to the sources of the cross-coupled transistor pair, the first input voltage being coupled to the gates of the pair of current injection transistors; coupling a second input voltage to a second oscillator, the second oscillator comprising a cross-coupled transistor pair, a load pair coupled to the drains of the cross-coupled transistor pair, an integrating capacitor coupled to the sources of the cross-coupled transistor pair, and a pair of current injection transistors having drains coupled to the sources of the cross-coupled transistor pair, the second input voltage being coupled to the gates of the pair of current injection transistors; coupling the voltages at the sources of the cross-coupled transistor pair of the first oscillator to the gates of a first differential pair via inverters, the drains of the first differential pair coupled to the drains of the cross-coupled transistor pair of the second oscillator; and coupling the voltages at the sources of the cross-coupled transistor pair of the second oscillator to the gates of a second differential pair via inverters, the drains of the second differential pair coupled to the drains of the cross-coupled transistor pair of the first oscillator.