Low phase noise voltage controlled oscillators
AssigneeBroadcom Corporation
InventorsFarid Shirinfar, Tirdad Sowlati, Maryam Rofougaran, Ahmadreza Rofougaran
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Abstract
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.
Claims20
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.
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 parallel to provide the output oscillating signal at the output.
A multi-injection voltage controlled oscillator (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 output using a first transformer and to magnetically couple the second oscillating signal to the output using a second transformer.
Dependencies are inferred from the claim text.