The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 16, 2007
Filed:
Feb. 25, 2005
Vladimir Aparin, San Diego, CA (US);
Yue Wu, San Diego, CA (US);
Vladimir Aparin, San Diego, CA (US);
Yue Wu, San Diego, CA (US);
Qualcomm Incorporated, San Diego, CA (US);
Abstract
A Voltage Controlled Oscillator (VCO) in a battery-powered device, such as a cellular phone, can be configured to tune across a fairly wide frequency range using a relatively narrow control voltage range. The frequency response of the VCO can be temperature compensated by applying a temperature variable voltage source to varactors that form part of a VCO resonant circuit. The reference end of the varactor can be supplied with a temperature dependent voltage source that has a temperature dependence that substantially compensates for varactor temperature dependence. The temperature dependent voltage source can be a Proportional To Absolute Temperature (PTAT) device.