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60GHZ phase-locked loop voltage-controlled CMOS LC oscillator resisting process fluctuation under low voltage

A voltage control and low voltage technology, applied in the field of voltage control CMOSLC oscillators, can solve the problems of high price and achieve the effect of improving the yield

Active Publication Date: 2016-01-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These processes have small parasitic capacitance, low substrate loss, and fast device operation, but these processes are expensive and difficult to integrate with the baseband digital processing chip based on the CMOS process at the back end of the transceiver

Method used

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  • 60GHZ phase-locked loop voltage-controlled CMOS LC oscillator resisting process fluctuation under low voltage
  • 60GHZ phase-locked loop voltage-controlled CMOS LC oscillator resisting process fluctuation under low voltage
  • 60GHZ phase-locked loop voltage-controlled CMOS LC oscillator resisting process fluctuation under low voltage

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the examples are not intended to limit the present invention.

[0024] Such as figure 1 As shown in the traditional voltage-controlled oscillator circuit structure, the control voltage (VTUNE) controls the voltage difference between the two ends of the varactor, changes the capacitance of the varactor, and thus changes the output frequency of the voltage-controlled oscillator. The NMOS tube forms a negative resistance pair to supplement the energy lost when the resonant cavity oscillates. The synthesis and output buffer circuit first superimposes the two signals, at this time the fundamental wave is eliminated, the even harmonic is enhanced, and at the same time it amplifies the even harmonic output signal and matches the output impedance with the load. This traditional structure can be specifically designed through different implementation ...

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Abstract

The invention discloses a 60GHZ phase-locked loop voltage-controlled CMOS LC oscillator resisting process fluctuation under low voltage. The oscillator comprises a negative resistance pair circuit composed of NMOS devices N2 and N3, a resonant cavity composed of accumulative varactors C2 and C3 and an inductor L2, a synthesis and output buffer circuit composed of NMOS devices N1 and N5, an inductor L1 and a capacitor C1, and a bulk voltage modulation circuit composed of an NMOS device N4 and a polysilicon resistor R1, wherein the negative resistance pair circuit and the resonant cavity form an LC oscillator. By appropriately increasing the bulk voltage of N1, N5, N2 and N3, the threshold of the N tubes can be reduced, and the circuit is enabled to work at low voltage. By introducing the bulk voltage modulation circuit, the influence of process fluctuation on the performance of the LC oscillator and the synthesis and output buffer circuit is reduced.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a voltage-controlled CMOSLC oscillator used for resisting process fluctuations under low voltage of a phase-locked loop. Background technique [0002] With the rapid development of modern wireless communication technology, our requirements for data transmission rate are getting higher and higher. In the available wireless communication frequency band, the 60GHz frequency band has two characteristics of high carrier frequency and large available bandwidth. Based on the 60GHz frequency band, the transmission rate can be increased to 1Gbps-10Gbps, meeting the industry's increasing requirements for transmission rates. This also promotes the research and development of low-cost, low-power 60GHz CMOS wireless transceivers. In the 60GHz wireless transceiver, the 60GHz PLL is a core module. The phase-locked loop affects the performance of the entire transceiver, and the voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099
Inventor 周骞韩雁张世峰
Owner ZHEJIANG UNIV