Title:
SIGNAL OUTPUT CIRCUIT WITH QUARZ RESONATOR
Document Type and Number:
Japanese Patent JPS52147481
Kind Code:
A
Abstract:
A method and apparatus utilizing a quartz crystal resonator with an orientation substantially equal to (yxwl) 21.93 DEG /33.93 DEG vibrating simultaneously in two thickness modes to accurately measure temperature and unknown frequencies or to provide a stable frequency signal source. By combining a quartz crystal resonator of the above type with either digital or analog compensation, the frequency-temperature deviation of one of the crystal mode frequencies is used as an internal thermometer and the second crystal mode frequency as a reference frequency signal. The frequency signal for the thermometer function is utilized by the compensation network to correct the measurements made with, or to stabilize, the frequency of the reference frequency signal. Additionally, the analog or digital compensation is accomplished by means of either a curve-fitting routine or an interpolation look-up table routine.
Inventors:
JIYON EE KUSUTAA
JIERII JII RIICHI
MITSUCHIERU SHII FUITSUSHIYAA
JIERII JII RIICHI
MITSUCHIERU SHII FUITSUSHIYAA
Application Number:
JP6460777A
Publication Date:
December 07, 1977
Filing Date:
June 01, 1977
Export Citation:
Assignee:
HEWLETT PACKARD YOKOGAWA
International Classes:
G04G3/00; G01K7/32; G01R23/10; H03B25/00; H03L1/02; (IPC1-7): G01K7/32
Domestic Patent References:
| JPS5080869A | 1975-07-01 |