Title:
【発明の名称】周波数安定化装置
Document Type and Number:
Japanese Patent JP2880376
Kind Code:
B2
Abstract:
A receiver which has a linear approximation expression showing a relationship between the frequency deviations and corresponding changes to the voltage which is to be supplied to the voltage controlled reference oscillator to adjust the deviation following a reception frequency. The frequency deviation of the voltage controlled temperature compensated crystal oscillator is calculated based on the count values of the counters which count the frequency of the second local oscillator and the second intermediate frequency. The control voltage supplied to the voltage controlled temperature compensated oscillator is changed based on the linear approximation expression. Further, the approximation expression is represented as a series of powers of 2 based on a sensitivity coefficient of the voltage controlled reference oscillator. The approximation expression is changed by renewing the sensitivity coefficient of the voltage controlled reference oscillator. Moreover, in addition to the control of the voltage controlled reference oscillator, the second local oscillator is controlled in the similar way of the control of the voltage controlled temperature compensated oscillator to obtain more accurate intermediate frequency.
Inventors:
FUKUI SHINICHI
Application Number:
JP16380393A
Publication Date:
April 05, 1999
Filing Date:
June 10, 1993
Export Citation:
Assignee:
MITSUBISHI DENKI KK
International Classes:
H03J7/02; H03J7/06; H03L1/02; H04B1/26; (IPC1-7): H03J7/02; H04B1/26
Domestic Patent References:
| JP63281527A |
Attorney, Agent or Firm:
Hiroaki Tazawa (1 person outside)