Voltage controlled oscillator using capacitive degeneration

摘要

A VCO is based on a capacitively emitter degenerated topology which uses a cross-coupled MOS pair as the degeneration cell. The cross-coupled MOS pair contributes additional conductance and results in a higher maximum attainable oscillation frequency and better negative resistance characteristics as compared to the other topologies at high frequencies. These properties of the disclosed VCO combined with small effective capacitance enable low-power low-noise high-frequency VCO implementations.