Low phase noise voltage-controlled oscillator

A voltage-controlled oscillator, low phase noise technology, applied in the direction of power oscillators, electrical components, etc., can solve the problems of low phase noise optimization design difficulties, limited quality factor, etc., to improve the effective quality factor, improve phase noise performance, The effect of eliminating the deterioration of phase noise

Inactive Publication Date: 2013-05-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to factors such as skin effect and high loss of the substrate, the quality factor available for on-chip inductors is limited.
On the other hand, as the feature size of the CMOS process decrea

Method used

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Embodiment Construction

[0018] In order to further illustrate the advantages of the present invention and the specific technical means adopted, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It is understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art should fall within the protection scope of the claims of the present application to the amendments of various equivalent forms of the present invention .

[0019] refer to figure 1 , the low-phase-noise voltage-controlled oscillator of the present invention includes a negative resistance circuit module and a differentially coupled inductor-capacitor resonant cavity, wherein:

[0020] Negative resistance circuit module includes PMOS tube M p , NMOS tube M n , the power supply VDD is connected in series with the source ...

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Abstract

The invention discloses a low phase noise voltage-controlled oscillator. The low phase noise voltage-controlled oscillator comprises a negative resistance circuit module, a difference coupling inductor capacitor resonant cavity and a source feedback inductor. The coupling inductance capacitor resonant cavity is used for improving an effective quality factor of the resonant cavity. Magnetic coupling between the source feedback inductor and the resonant cavity inductor is regarded as the feedback for increasing the amplitude of output signals of the resonant cavity, and the negative resistance circuit module adopts a current multiplexing structure to reduce power dissipation and remove deterioration of the phase noise by a second harmonic of a common mode node. The low phase noise voltage-controlled oscillator can effectively reduce phase noise.

Description

technical field [0001] The invention belongs to the technical field of radio frequency wireless receiver integrated circuits, and in particular relates to a voltage-controlled oscillator with low phase noise. Background technique [0002] A voltage-controlled oscillator is a module used to generate local oscillator signals in a communication system, and its performance directly determines the performance of the communication system. As a main performance index of the voltage controlled oscillator, the phase noise affects the sensitivity of the receiver and the adjacent channel interference of the transmitter. Therefore, it is particularly important to design a voltage-controlled oscillator with low phase noise for modern wireless communication systems. [0003] The implementation forms of voltage-controlled oscillators mainly include ring oscillators and inductor-capacitor voltage-controlled oscillators. Ring oscillators are mainly used to generate on-chip clock signals du...

Claims

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Application Information

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IPC IPC(8): H03B5/32H03B5/04
Inventor 樊祥宁李斌王加锋施晓阳王志功
Owner SOUTHEAST UNIV
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