会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 9. 发明专利
    • Oscillation circuit
    • 振荡电路
    • JP2012114651A
    • 2012-06-14
    • JP2010261418
    • 2010-11-24
    • Fujitsu LtdFujitsu Semiconductor Ltd富士通セミコンダクター株式会社富士通株式会社
    • NAKAMOTO HIROYUKIITO HIROYUKI
    • H03B5/32
    • H03B5/36H03B2200/0012
    • PROBLEM TO BE SOLVED: To provide an oscillation circuit that can be easily and accurately calibrated in terms of frequency.SOLUTION: An oscillation circuit includes: a first inverter circuit 1 having an input terminal and an output terminal connected to both ends of a piezoelectric vibrator 4; a first feedback resistance 3 disposed between the input and output terminals of the first inverter circuit; first and second variable capacity elements 2a, 2b connected to the input and output terminals of the first inverter circuit, respectively, and having a capacity value that can be set variably by a control signal; a charge circuit 10 for supplying a predetermined reference current to the input terminal or output terminal to charge the first or second variable capacity element; a comparator 11 for comparing a charge voltage at the input terminal or output terminal with a reference voltage V; and a control circuit 12 for, at the time of calibration, instructing the charge circuit to start to supply the reference current to the input terminal or output terminal at a first time and, in response to a comparison result of the comparator at a second time later than the first time, generating a control signal to set the capacity value of the first or second variable capacity element such that the charge voltage approaches the reference voltage.
    • 要解决的问题:提供可以容易且准确地校准频率的振荡电路。 解决方案:振荡电路包括:第一反相器电路1,其具有连接到压电振动器4的两端的输入端子和输出端子; 设置在第一反相器电路的输入和输出端之间的第一反馈电阻3; 第一和第二可变电容元件2a,2b分别连接到第一反相器电路的输入和输出端子,并具有可由控制信号可变地设定的容量值; 用于向输入端子或输出端子提供预定参考电流以对第一或第二可变容量元件充电的充电电路10; 比较器11,用于将输入端或输出端的充电电压与基准电压V R“进行比较; 以及控制电路12,用于在校准时指示充电电路开始在第一时间向输入端或输出端提供参考电流,并且响应于比较器在第二时间的比较结果 产生一个控制信号以设置第一或第二可变容量元件的容量值使得充电电压接近参考电压。 版权所有(C)2012,JPO&INPIT