Effect of adding coils to dual-input twin-T quartz circuit

被引:2
|
作者
Hirama, Koichi [1 ]
Nakagawa, Yasuhiko
Yanagisawa, Takeshi
机构
[1] Univ Yamanashi, Kofu, Yamanashi 4008511, Japan
[2] Tokyo Inst Technol, Tokyo 1528550, Japan
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2007年 / 46卷 / 7B期
关键词
frequency control; T-circuit; voltage ratio; electromechanical coupling factor; unloaded Q factor;
D O I
10.1143/JJAP.46.4669
中图分类号
O59 [应用物理学];
学科分类号
摘要
We derived an exact frequency equation and examined the behaviors of the effective Q factor and effective resistance for the case in which coils are added to a dual-input twin-T quartz circuit whose null frequency can be changed by adjusting the applied voltage ratio. In the circuit construction, two sets of T-circuits are used in which a quartz resonator is placed in the shunt branch and the output of each circuit settles in one terminal. The changeable frequency range exceeds the limit determined by the electromechanical coupling factor of the piezoelectric resonator used without any decrease in the effective Q factor and any increase in the effective resistance, within the entire changeable-frequency range when the resonance frequency of a coil and a capacitor in the series branch of the twin-T circuit is set to almost the same value as the resonance frequency of the resonators used in the twin-T circuit. The derived null-frequency equation and effective Q factor agreed with the experimental results for AT-cut quartz resonators.
引用
收藏
页码:4669 / 4674
页数:6
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