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Fully decoupled lc-tank based oscillator topology and decoupling method thereof

A resonant circuit and oscillator technology, applied in the field of information processing

Active Publication Date: 2013-03-27
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, in almost all technologies, the breakdown voltage of active devices is much lower than that of passive devices

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  • Fully decoupled lc-tank based oscillator topology and decoupling method thereof
  • Fully decoupled lc-tank based oscillator topology and decoupling method thereof
  • Fully decoupled lc-tank based oscillator topology and decoupling method thereof

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Embodiment Construction

[0026] The present principles are directed to a fully decoupled inductor-capacitor (LC) resonant tank based oscillator topology for low phase noise and high oscillation amplitude applications.

[0027] According to one embodiment of the principles of the present invention, we propose a way for operating an oscillator such that the amplitude of the oscillation is not limited by the breakdown voltage of the active devices. Conversely, the LC tank is decoupled from the active components, and the coupling ratio between the LC tank and the active components is set such that the oscillation amplitude reaches a maximum value determined only by the breakdown of the passive components. For example, we envision a situation where the oscillator uses active devices with a breakdown voltage of 1V to safely achieve a peak-to-peak differential amplitude of 40V.

[0028] According to one embodiment of the principles of the present invention, we subject the active devices within the oscillator...

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Abstract

The invention relates to a fully decoupled lc-tank based oscillator topology and a decoupling method thereof. There is provided a tank based oscillator. The oscillator includes one or more active devices, one or more passive devices, and a tank circuit decoupled from the active devices using at least one of the one or more passive devices. A coupling ratio between the tank circuit and the one or more active devices is set such that a maximum value of an oscillation amplitude of the tank circuit is limited based upon a breakdown of only the one or more passive devices.

Description

technical field [0001] The present invention relates generally to information processing, and in particular to a fully decoupled LC tank based oscillator topology for low phase noise and high oscillation amplitude applications. Background technique [0002] The phase noise of an oscillator is a critical performance metric in many wireless and wired communication applications, radar, sensors, imagers, data converters, and the like. The performance of any clocked system will benefit from a lower noise oscillator. One way to reduce the phase noise of an oscillator is to increase the amplitude of the oscillation. In a given technology, the maximum amplitude is determined by the breakdown of the active device (FET, BJT or other type of device). The phase noise of the oscillator can also be reduced by using lower noise devices or devices with higher breakdown, by lowering the temperature, etc. [0003] A general representation of oscillator noise is given by the Leeson formula ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/18
CPCH03B5/1215H03B5/12H03B5/1228H03B5/1278H03B5/1209
Inventor B·萨杜J-O·普鲁查特S·K·雷诺德A·V·里尔亚科夫J·A·蒂尔诺
Owner IBM CORP