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Programmable varactor for vco gain compensation and phase noise reduction

A variable capacitor and oscillator frequency technology, applied in the field of programmable variable capacitors, can solve problems such as multiple noise components of loop filter resistors

Active Publication Date: 2013-03-13
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Higher K V results in more noise contribution from the loop filter resistor

Method used

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  • Programmable varactor for vco gain compensation and phase noise reduction
  • Programmable varactor for vco gain compensation and phase noise reduction
  • Programmable varactor for vco gain compensation and phase noise reduction

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Embodiment Construction

[0037] The following detailed description is of the most generally contemplated modes of carrying out the invention. The description is not taken in a limiting sense, but merely for the purpose of illustrating the general principles of the invention, as the scope of the invention is best defined by the appended claims.

[0038] In general, embodiments of the present invention may include a plurality of varactors that are selectively disabled such that the VCO gain measurement of the VCO remains substantially constant. Embodiments may be used in a variety of applications that utilize VCOs, including radio transceivers (eg, mobile phones).

[0039] Embodiments of the present invention may differ from conventional VCOs at least by digitizing the varactors into multiple binary weighted varactors. Embodiments of the present invention may also differ from conventional VCOs at least by providing bits to control multiple binary weighted varactors. Embodiments of the present inventio...

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Abstract

A programmable varactor apparatus may include multiple binary weighted varactors controlled by multiple digital varactor bits. A programmable varactor apparatus may include a plurality of binary weighted varactors, and a control to selectively disable one or more of the plurality of binary weighted varactors to decrease an effective capacitance of the programmable varactor apparatus. A method for changing an effective capacitance of a programmable varactor apparatus may include providing a plurality of binary weighted varactors, and disabling one or more of the plurality of binary weighted varactors to decrease the effective capacitance of the programmable varactor apparatus.

Description

[0001] This application claims Serial No. 60 / 869,682, filed December 12, 2006, entitled "PROGRAMMABLE VARACTOR FOR VCO GAINCOMPENSATION AND PHASE NOISE REDUCTION" Priority of U.S. Provisional Application. technical field [0002] The present invention generally relates to voltage controlled oscillators (VCOs). More particularly, the present invention relates to programmable varactors for VCOs. Background technique [0003] An electronic oscillator can be an electronic circuit that generates an electrical signal. A voltage controlled oscillator (VCO) may be an electronic oscillator. VCOs can be used, for example, in radio transceivers (eg, mobile phones). [0004] The frequency of the VCO output signal can be controlled by the VCO's input tuning voltage. The frequency can be tuned by a variable capacitor with a specific capacitance. As shown, the specific capacitance can be a function of the input tuning voltage: [0005] f ( C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/00
CPCH03B5/1243H03B5/1228H03B5/1215H03B5/1265H03B2200/005H03B5/1278H03L7/099H03B5/08H03L7/00
Inventor 唐亦午
Owner QUALCOMM INC
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