Low phase noise LC-VCO

A voltage-controlled oscillator, low phase noise technology, used in power oscillators, electrical components, automatic power control and other directions, can solve problems such as increasing the phase noise of the output waveform, increase the amplitude of the oscillation waveform, reduce the number of traps, The effect of increasing magnitude

Active Publication Date: 2014-09-17
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the resonant circuit oscillates, the oscillating waveform is easily disturbed by the surrounding noise. If the amplitude of the oscillating waveform is small, the external interference will be more serious, which will increase the phase noise of the output waveform

Method used

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  • Low phase noise LC-VCO
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Examples

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Embodiment Construction

[0051] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are only used to illustrate the present invention, but can not be used to limit the scope of the present invention.

[0052] figure 2 Shown is an embodiment of a low-phase-noise inductance-capacitance voltage-controlled oscillator of the present invention, ind represents inductance, C1, C2, Cc1 and Cc2 represent fixed capacitances, Cvar1 and Cvar2 represent variable capacitances, R1 and R2 represent resistances, Mn1, Mn2, Mn3 and Mn4 represent NMOS transistors, and Mp1 and Mp2 represent PMOS transistors. Among them, the inductance ind, the fixed capacitors C1 and C2, and the variable capacitors Cvar1 and Cvar2 form a basic resonant circuit, and the voltage Vtune is connected to the anodes of the variable capacitors Cvar1 and Cvar2 to change the capacitance values ​​of Cvar1 and Cvar...

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Abstract

The invention relates to the technical field of LC-VCOs, in particular to a low phase noise LC-VCO. The current switching speed of a cross-coupling MOS pipe is improved, the current waveform duty ratio of the cross-coupling MOS pipe is reduced, and phase noise of the low phase noise LC-VCO due to the cross-coupling MOS pipe is further lowered. In addition, the number of traps of an NMOS pipe of a tail current source is reduced, and the phase noise of the low phase noise LC-VCO is further reduced. Energy provided by cross-coupling negative resistance is improved, the oscillation waveform amplitude of an oscillation circuit is improved, and the phase noise of the low phase noise LC-VCO is further reduced.

Description

technical field [0001] The invention relates to the technical field of an inductor-capacitor voltage-controlled oscillator, in particular to a low-phase-noise inductor-capacitor voltage-controlled oscillator. Background technique [0002] The LCC voltage-controlled oscillator is a key module in the clock generation and clock synthesis circuit, and the LCC voltage-controlled oscillator is usually used to generate high-frequency oscillation signals. However, as the oscillation frequency increases, the very small jitter of the oscillation waveform has a great impact on the work of other circuits, so as the frequency increases, the phase noise requirements for low phase noise LC VCOs become more and more severe. getting stricter. [0003] In the low-phase-noise LC voltage-controlled oscillator, the inductance and capacitance are connected in parallel to form a resonant circuit. After enough energy is supplied to the resonant circuit by the outside world, the resonant circuit os...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B7/06H03L7/099
Inventor 王源甘善良贾嵩张钢刚张兴
Owner PEKING UNIV
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