Title:
METHOD AND APPARATUS FOR COMPENSATING LOCAL OSCILLATOR FREQUENCY ERROR
Document Type and Number:
WIPO Patent Application WO2001086316
Kind Code:
A3
Abstract:
The frequency error of an oscillator is minimized by characterizing the oscillator. A reference signal from an external source containing a minimal frequency error is provided to an electronic device. The external signal is used as a reference frequency to estimate the frequency error of an internal frequency source. The electronic device monitors parameters that are determined to have an effect on the frequency accuracy of the internal frequency source. Temperature is one parameter known to have an effect on the frequency of the internal frequency source. The electronic device collects and stores the values of the parameters as well as the corresponding output frequency or frequency error of the internal frequency source. The resultant characterization of the internal frequency source is used to compensate the internal frequency source when the internal frequency source is not provided the external reference signal.
Inventors:
PATRICK CHRISTOPHER
YOUNIS SAED G
YOUNIS SAED G
Application Number:
PCT/US2001/014991
Publication Date:
October 10, 2002
Filing Date:
May 08, 2001
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
G01S1/00; G01S7/40; G01S19/03; G01S19/23; H03J7/04; H03L1/00; H03L7/06; H03L7/18; H03L1/02; H04B1/707; H04L27/00; (IPC1-7): G01S1/02; H04B1/707; H03J7/04; H03L1/02
Domestic Patent References:
| WO1997014049A2 | 1997-04-17 | |||
| WO1998025157A2 | 1998-06-11 |
Foreign References:
| US5740525A | 1998-04-14 | |||
| EP0483090A1 | 1992-04-29 | |||
| US5654718A | 1997-08-05 |
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