Title:
局部発振器周波数エラーを補正する方法及び装置
Document Type and Number:
Japanese Patent JP5128747
Kind Code:
B2
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
Eunice, Saed Gee
Eunice, Saed Gee
Application Number:
JP2001583208A
Publication Date:
January 23, 2013
Filing Date:
May 08, 2001
Export Citation:
Assignee:
QUALCOMM INCORPORATED
International Classes:
G01S19/23; G01S1/00; G01S7/40; G01S19/03; H03J7/04; H03L1/00; H03L7/06; H03L7/18; H03L1/02; H04B1/707; H04L27/00
Domestic Patent References:
| JP10065447A | ||||
| JP9189754A | ||||
| JP4097618A | ||||
| JP6291872A | ||||
| JP7254816A | ||||
| JP6242208A | ||||
| JP61155880A |
Foreign References:
| WO1999013595A1 | ||||
| EP0483090A1 |
Attorney, Agent or Firm:
Kurata Masatoshi
Sadao Muramatsu
Ryo Hashimoto
Toshio Shirane
Sadao Muramatsu
Ryo Hashimoto
Toshio Shirane