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2. 发明授权

US4709218A Overtone crystal oscillator 失效
标题翻译： Overtone晶体振荡器
公开(公告)号：US4709218A
公开(公告)日：1987-11-24
申请号：US885930
申请日：1986-07-15
申请人： Nakanobu Moritani , Mitsuyuki Sugita , Isamu Hoshino , Hirofumi Yanagi , Hitoshi Ikeno , Tetsuro Konno
发明人： Nakanobu Moritani , Mitsuyuki Sugita , Isamu Hoshino , Hirofumi Yanagi , Hitoshi Ikeno , Tetsuro Konno
IPC分类号： H03B5/32 , H03B5/36
CPC分类号： H03B5/32
摘要： An overtone crystal oscillator includes a crystal vibrator, a CMOS circuit connected in parallel to the crystal vibrator, and two load capacitors connected to the input and output of the CMOS circuit, respectively. The capacitors have respective capacitances C.sub.g and C.sub.d determined to satisfy at least one of following two conditions wherein the first condition is that an oscillation starting resistance R.sub.KN of a desired N-th overtone is sufficiently larger than an effective resistance R.sub.QN of the crystal vibrator of the N-th overtone, the oscillation starting resistance being expressed as:R.sub.KN =K/(.omega..sup.2 .multidot.C.sub.g .multidot.C.sub.d)(.omega.: oscillating frequency, K: constant determined by mutual conductance of the CMOS circuit) and the second condition is that an effective resistance R.sub.Qn of the crystal vibrator of another n-th overtone except the desired N-th overtone satisfies the following relationR.sub.Qn >N.sup.2 .multidot.R.sub.KN /n.sup.2.
摘要翻译：泛音晶体振荡器包括晶体振荡器，与晶体振荡器并联连接的CMOS电路，以及分别连接到CMOS电路的输入和输出的两个负载电容器。电容器具有确定为满足以下两个条件中的至少一个的各自的电容Cg和Cd，其中第一条件是所需N次谐波的振荡起始电阻RKN充分大于所述第N个泛音的晶体振子的有效电阻RQN 第N个泛音，振荡起始电阻表示为：RKN = K /（ω2×2Cg×Cd）（ω：振荡频率，K：由CMOS电路的互导确定的常数），第二条件是有效电阻RQn 除了所需的N次谐波之外的另一个第n个泛音的晶体振荡器满足以下关系RQn> N2xRKN / n2。

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