发明申请
- 专利标题： PIEZOELECTRIC VIBRATOR AND OSCILLATION CIRCUIT USING THE SAME
- 专利标题（中）： 使用它的压电振动器和振荡电路
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申请号： US13048334申请日： 2011-03-15
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公开(公告)号： US20110163821A1公开(公告)日： 2011-07-07
- 发明人: Hiroyuki Souma , Seigo Fukuchi , Satoshi Shimizu
- 申请人： Hiroyuki Souma , Seigo Fukuchi , Satoshi Shimizu
- 优先权： JP2008-238273 20080917
- 主分类号： H03B5/12
- IPC分类号： H03B5/12
摘要：
In a circuit including a CMOS inverter (inverting amplifier) (IV02), a floating capacitance resulting from the circuit and peripheral interconnections thereof is Cs, a capacitive element (Cg) is connected to the input side of the CMOS inverter (inverting amplifier) (IV02), a capacitive element (Cd) is connected to the output side thereof, and the capacitances of the capacitive element (Cg) and the capacitive element (Cd) are determined (tuned) so that a load capacitance (CL) of a piezoelectric vibrator (X2) satisfies a relational expression “CL=Cs+Cg×Cd/(Cg+Cd)”. By determining the capacitances of the capacitive element (Cg) and the capacitive element (Cd) in this way, it is possible to improve the oscillation frequency stability with respect to a variation in capacitance value of the load capacitance (CL) in a region of a low load capacitance (CL) (for example, 3 pF).
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