Low-phase-noise self-injection voltage-controlled oscillator for 60GHz phase-locked loop and wireless transceiver

Abstract

The invention discloses a low-phase-noise self-injection voltage-controlled oscillator for a 60GHz phase-locked loop and a wireless transceiver. The voltage-controlled oscillator comprises a plurality of same LC oscillators, wherein NMOS (N-Channel Metal Oxide Semiconductor) devices construct negative resistance pairs; accumulation-mode varactors and inductors construct resonant cavities; the NMOS devices, the inductors and capacitors construct an output buffer circuit; the capacitors construct a self-injection circuit; and stray capacitance of the LC oscillators is kept the same through the NMOS devices. The same oscillator cores are adopted, and oscillation signals are injected into corresponding resonant cavities. Through an injection locking principle, a resonant cavity circuit is locked at the same working frequency point, and an output waveform phase is synchronized. Through waveform superimposition at the moment, local frequency power in an output waveform is increased, and noise is not increased remarkably under the filtering actions of the LC resonant cavities, so that phase noise output by a voltage-controlled CMOS (Complementary Metal-Oxide-Semiconductor Transistor) oscillator can be reduced remarkably, and an FOM value of the voltage-controlled oscillator is lowered at the same time.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a low-phase-noise self-injection-locked voltage-controlled CMOSLC oscillator used for a 60GHz phase-locked loop at low voltage. Background technique [0002] With the vigorous development of modern wireless communication technology, our requirements for data transmission rate are getting higher and higher. In the wireless communication frequency band, the 60GHz frequency band has two characteristics of high carrier frequency and large available bandwidth. In the 60GHz frequency band, people can easily increase the transmission rate to 1Gbps-10Gbps, meeting the industry's requirements for transmission rates. This has also promoted the research and development of low-cost, low-power 60GHz CMOS wireless transceivers. In a 60GHz transceiver, a 60GHz phase-locked loop is an essential module. The performance of the phase-locked loop affects the performance of the entire tran...

AI Technical Summary

Problems solved by technology

These processes have small parasitic capacitance, low substrate loss, fast device operation, and better improvement in the output phase noise of the voltage-controlled oscillator. Processing chip integration

[0007] In summary, when the operating frequency is 60GHz, it is difficult for the traditional CMOS voltage controlled oscillator circuit based on LC structure to obtain lower phase noise at low voltage

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