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    • 6. 发明授权
    • Overtone crystal oscillator
    • Overtone晶体振荡器
    • US4709218A
    • 1987-11-24
    • US885930
    • 1986-07-15
    • Nakanobu MoritaniMitsuyuki SugitaIsamu HoshinoHirofumi YanagiHitoshi IkenoTetsuro Konno
    • Nakanobu MoritaniMitsuyuki SugitaIsamu HoshinoHirofumi YanagiHitoshi IkenoTetsuro Konno
    • H03B5/32H03B5/36
    • H03B5/32
    • 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.
    • 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。
    • 8. 发明授权
    • Adjustable frequency crystal oscillator with temperature compensation
    • 可调频率晶体振荡器,带温度补偿
    • US4583059A
    • 1986-04-15
    • US454250
    • 1982-12-29
    • Tetsuro Konno
    • Tetsuro Konno
    • H03L1/02H03B5/32
    • H03L1/027
    • An adjustable frequency crystal oscillator circuit has an adjustment capacitor which is connected in parallel, via a switching circuit, to a load capacitor of a piezoelectric vibrator. The oscillation frequency is controlled by varying the duty factor of the pulses applied to the switching circuit for switching the adjustment capacitor into and out of parallel connection with the load capacitor. The frequency-temperature characteristic is compensated for by varying the duty factor according to changes in temperature. No trimmer capacitor is needed, and the frequency-temperature characteristic is effectively compensated for over a wide temperature range.
    • 可调频率晶体振荡器电路具有通过开关电路并联连接到压电振动器的负载电容器的调节电容器。 通过改变施加到开关电路的脉冲的占空因数来控制振荡频率,以将调节电容器切换到与负载电容器并联的并联连接。 通过根据温度变化改变占空因数来补偿频率 - 温度特性。 不需要微调电容器,并且在宽温度范围内有效地补偿了频率 - 温度特性。