Integrated circuits including an lc tank circuit and operating methods thereof

An inductor-capacitor and integrated circuit technology, applied in the field of semiconductor circuits, can solve the problems of limited manual adjustment of tail current, discrete, and inability to properly compensate the loss of inductor-capacitor voltage control oscillators, etc.

Active Publication Date: 2013-09-11
TAIWAN SEMICON MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manual adjustment of tail current is limited and discrete
Also, manual adjustment of the tail current may not properly compensate for LC VCO losses from excessive interconnect resistance variation if the total tail current present is insufficient

Method used

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  • Integrated circuits including an lc tank circuit and operating methods thereof
  • Integrated circuits including an lc tank circuit and operating methods thereof
  • Integrated circuits including an lc tank circuit and operating methods thereof

Examples

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Embodiment Construction

[0034] It can be appreciated that the following disclosure provides many different embodiments, or examples, for implementing the various disclosed features. The elements and arrangements of certain examples are described below to simplify the present disclosure. Of course, this is only an example and not a limitation. Additionally, the present disclosure may repeat reference numerals and / or letters in various instances. Repetition is for simplicity and clarity and does not illustrate the relationship and / or configuration of the various embodiments. In addition, forms in which a feature is on, connected to, and / or coupled to another feature in the present disclosure may subsequently include embodiments where the features are made in direct contact, and may also include where additional features are made intervening features. Example, so that features may not be in direct contact. Furthermore, spatially relative terms, for example, "lower", "higher", "horizontal", "vertical"...

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Abstract

An integrated circuit includes an inductor-capacitor (LC) tank circuit coupled with a feedback loop. The LC tank circuit is configured to output an output signal having a peak voltage that is substantially equal to a direct current (DC) voltage level plus an amplitude. The feedback loop is capable of determining if the peak voltage of the output signal falls within a range between a first voltage level and a second voltage level for adjusting the amplitude of the output signal.

Description

technical field [0001] The present invention relates to the field of semiconductor circuits, and in particular to integrated circuits including LC tank circuits and methods of operation thereof. Background technique [0002] Phase locked loops (PLLs) are widely used in electronic designs such as radios, television receivers, video devices, satellite broadcasting, and instrumentation systems. A phase locked loop is an electronic circuit that has a voltage controlled oscillator (VCO) or a current controlled oscillator (CCO) and is continuously driven to match the frequency of the input signal. For low phase noise performance, an inductor-capacitor (LC) type voltage-controlled oscillator (LCVCO or LC-tank VCO) is used. Essentially, an inductor-capacitor type voltage controlled oscillator has a small frequency adjustment range. In order to resist program variation and cover a wide range of frequency operation, a series of capacitor storage places are required to increase the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K3/00H03K3/027H03B5/04
CPCH03B5/1243H03B5/1228H03B5/1215H03L7/099H03L5/00
Inventor 陈建宏薛福隆普强荣林志昌
Owner TAIWAN SEMICON MFG CO LTD
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