Title:
MICROCOMPUTER-CONTROLLED PIEZOELECTRIC OSCILLATOR
Document Type and Number:
Japanese Patent JP2738319
Kind Code:
B2
Abstract:
PURPOSE: To perform accurate temperature compenstation even for the rapid change of an ambient temperature and to prevent the degradation of frequency stability.
CONSTITUTION: A frequency divider 2, the frequency divider 3 and a highly accurate frequency comparator 4 are provided. An output frequency F (t0) when the ambient temperature T is t0 is defined as a center frequency f0 and a difference between the frequency divided output frequency F1 (t0) of the frequency divider 2 and the frequency divided output frequency F2 (t0) of the frequency divider 3 at the time is stored in a memory circuit 7 as a reference value. A microcomputer circuit 6 obtains the change amount Δf of the output frequency F to the center frequency f0 based on the reference value stored in the memory circuit 7 and a digital code from an analog/digital converter 5, supplies an analog voltage corresponding to the change amount Δf through a digital/analog converter 8 to a voltage-controlled piezoelectric oscillator 1 and keeps the output frequency F at the center frequency f0.
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Inventors:
IWAMOTO HIROYUKI
Application Number:
JP30622794A
Publication Date:
April 08, 1998
Filing Date:
December 09, 1994
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
G01L1/10; H01L41/08; H03B5/04; H03L1/02; H03L7/06; (IPC1-7): H03L7/06; H03B5/04; H03L1/02
Domestic Patent References:
| JP365819A | ||||
| JP5347639A | ||||
| JP63116521A |
Attorney, Agent or Firm:
Masaki Yamakawa