Patent ID: 8779861
Filing Date: 2014-07-15
Classification: H03K

Abstract:
1. A multi-phase voltage controlled oscillator (VCO) comprising: a chain of at least four ring oscillator delay stage cells, wherein each stage comprises a Gm/C delay element and a LC tank load that creates no ambiguity of phase rotation direction, wherein an output voltage of each stage in said chain is input as an input voltage of a subsequent stage in said chain, wherein the output voltage of a last stage in said chain is fed back as an input voltage of a first stage in said chain, wherein each delay stage in said chain exhibits no phase shift from input to output at resonance, and wherein each stage in said chain comprises: wherein said LC tank load is directly connected to said first drain without direct connection to said first gate and without direct connection to any other transistor other than said first transistor, wherein said first bulk terminal is connected to said first source and said second bulk terminal is connected to ground, and wherein said first transistor and said second transistor are connected to each other in a non-cross-coupled configuration.