Title:
VOLTAGE CONTROLLED CRYSTAL OSCILLATOR
Document Type and Number:
Japanese Patent JPH0575446
Kind Code:
A
Abstract:
PURPOSE: To correct a secular change at all times by providing a voltage controlled frequency correction circuit in the crystal oscillator circuit.
CONSTITUTION: Two voltage control circuits 2, 3 are provided in the inside of the crystal oscillator circuit 1, a temperature sensor 8 and an A/D converter 9 designate an allowable temperature range for frequency correction, a CPU 7 sends data for frequency correction, which are stored in a memory 6 and either a D/A converter 4 or 5 is operated to correct the frequency.
Inventors:
MATSUURA IWAO
Application Number:
JP23141391A
Publication Date:
March 26, 1993
Filing Date:
September 11, 1991
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H03B5/32; H03L1/02; (IPC1-7): H03B5/32; H03L1/02
Attorney, Agent or Firm:
Akira Kobiji (2 outside)
Next Patent: TIMING CALIBRATION SYSTEM