Title:
OSCILLATOR HAVING DIGITAL TEMPERATURE COMPENSATING CIRCUIT
Document Type and Number:
Japanese Patent JPS56104505
Kind Code:
A
Abstract:
The oscillator circuit comprises a digital temperature compensation circuit connected to a low and a high frequency quartz oscillator. The two quartz oscillators have the same inversion temperature points and a different temperature behaviour. In the temperature compensation circuit a beat frequency is produced between the divided signal of the high frequency oscillator and the frequency of the low frequency oscillator and then fed to a correction circuit and multiplied therein with a correction factor which has been stored in a PROM. The obtained correction signal is fed into the frequency divider chain for obtaining a temperature compensated outgoing signal for use in a timer circuit. The temperature compensation circuit is simply designed and allows high accuracy, which is particularly well suited for a wristwatch or a photo camera.
Inventors:
ARUFUONSU ZUMUSUTETSUGU
Application Number:
JP200581A
Publication Date:
August 20, 1981
Filing Date:
January 09, 1981
Export Citation:
Assignee:
SUISSE HORLOGERIE
International Classes:
G04F5/06; G04G3/02; H03L1/02; (IPC1-7): H03B5/04; H03L1/02
Domestic Patent References:
| JPS5084274A | 1975-07-08 | |||
| JPS5325341A | 1978-03-09 | |||
| JPS5476261A | 1979-06-18 |