Title:
METHOD AND APPARATUS FOR COMPENSATING LOCAL OSCILLATOR FREQUENCY ERROR THROUGH ENVIRONMENTAL CONTROL
Document Type and Number:
WIPO Patent Application WO2001086809
Kind Code:
A3
Abstract:
The frequency error of an oscillator is minimized by characterizing the operating environment of the oscillator. An 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 and a primary contributor to device temperature is the RF Power Amplifier (PA). The electronic device collects and stores the activity level of the PA. The effective PA duty cycle over a predetermined period of time is calculated. The LO operating environment is stabilized by operating the PA at the calculated duty cycle when the LO is required to operate in a high stability mode.
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Inventors:
PATRICK CHRISTOPHER
YOUNIS SAED G
YOUNIS SAED G
Application Number:
PCT/US2001/014993
Publication Date:
March 07, 2002
Filing Date:
May 08, 2001
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
H03L7/06; H03J7/04; H04B1/16; (IPC1-7): H03L1/02
Domestic Patent References:
| WO1999057929A1 | 1999-11-11 |
Foreign References:
| EP0483090A1 | 1992-04-29 | |||
| GB2313002A | 1997-11-12 |
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