Title:
【発明の名称】水晶発振器のための温度補償回路および温度補償を提供する方法
Document Type and Number:
Japanese Patent JP2000507073
Kind Code:
A
Abstract:
A temperature compensation (TC) circuit (10) for a crystal oscillator module (12) used in a communication device (200). An existing microcontroller (210) of the communication device (200) is used to provide TC digital data (30) for a crystal oscillator (18). In this way, the crystal oscillator module (12) does not require an on-board memory which substantially cuts costs. TC digital data (30) is converted to a TC signal (22) in a digital-to-analog converter which controls the crystal oscillator frequency. To compensate for radio voltage regulator variations over temperature, the crystal oscillator module (12) includes an on-board voltage regulator (34) which supplies a characterized regulated voltage (36) to the digital-to-analog converter such that the TC signal (22) from the digital-to-analog converter is inherently corrected for voltage variations in the voltage regulator (34). This improves stability of output frequency (20) from 5 ppm to about 2 ppm.
Inventors:
Vodgewada Karl Yi
Caluba James F
Satrif Richard N
Caluba James F
Satrif Richard N
Application Number:
JP52772398A
Publication Date:
June 06, 2000
Filing Date:
November 25, 1997
Export Citation:
Assignee:
CTS CORPORATION
International Classes:
H03B5/32; H03B5/36; H03J7/12; H03L1/02; H04B1/40; (IPC1-7): H03B5/32; H03L1/02; H04B1/40
Attorney, Agent or Firm:
Takehiko Suzue (5 outside)