Title :
A dual-T quartz crystal resonator circuit and its application to 10MHz oscillator
Author :
Adachi, Takehiko ; Akamatsu, Daisuke ; Hirama, Koichi ; Nakagawa, Yasuhiko ; Yanagisawa, Takeshi
Author_Institution :
Fac. of Eng., Yokohama Nat. Univ., Yokohama
Abstract :
In this paper, we have proposed a dual-T quartz crystal resonator circuit of which its resonance frequency can be changed a several thousand ppm exceeding the limit of the piezoelectric coupling factor of a crystal resonator. We have made the measurement of the frequency characteristics of the proposed dual-T circuit composed of 9.995 MHz and 10.005 MHz crystal resonators having the same quality factors. The dual-T circuit showed a single resonant not filter characteristics. And the resonance frequency could be changed about 1000 ppm between the resonance frequencies of the two crystal resonators. We have made an oscillator using the dual-T circuit and measured its performance, too. The variable range about 1000 ppm of the oscillation frequency was observed.
Keywords :
Q-factor; crystal oscillators; dual-T quartz crystal resonator circuit; frequency 10 MHz; frequency 10.005 MHz; frequency 9.995 MHz; oscillator; piezoelectric coupling factor; quality factors; resonance frequency; Capacitance; Coupling circuits; Equivalent circuits; Frequency measurement; Q factor; RLC circuits; Resonance; Resonant frequency; Resonator filters; Voltage-controlled oscillators;
Conference_Titel :
Frequency Control Symposium, 2008 IEEE International
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-1794-0
Electronic_ISBN :
1075-6787
DOI :
10.1109/FREQ.2008.4622995
