Low phase noise voltage controlled oscillators

摘要

A voltage controlled oscillator (VCO) with low phase noise and a sharp output spectrum is desirable. The present disclosure provides embodiments of LC tank VCOs that generate output signals with less phase noise compared with conventional LC tank VCOs, while at the same time limiting additional cost, size, and/or power. The embodiments of the present disclosure can be used, for example, in wired or wireless communication systems that require low-phase noise oscillator signals for performing up-conversion and/or down-conversion.

主权项

1. A multi-injection voltage controlled oscillator (VCO) for providing an output oscillating signal at an output, the multi-injection VCO comprising:
a first inductor-capacitor tank VCO configured to generate a first oscillating signal; a second inductor-capacitor tank VCO configured to generate a second oscillating signal; and an output coupler configured to magnetically couple the first oscillating signal to the second oscillating signal in series to provide the output oscillating signal at the output.