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    • 36. 发明授权
    • Frequency switching method, voltage controlled oscillator using same and receiver for spread spectrum communication using same
    • 频率切换方法,使用相同的压控振荡器和使用它的扩频通信的接收机
    • US06611549B1
    • 2003-08-26
    • US09320693
    • 1999-06-08
    • Minoru Nagata
    • Minoru Nagata
    • H04B169
    • H03J7/045H04B1/707H04B2201/70707
    • A crystal oscillator which configures a voltage controlled oscillator having a variable oscillation frequency is also used as a crystal oscillator of an oscillator for generating a fixed frequency. Control input is integrated by an integrator, a phase of a frequency-divided signal obtained by dividing a fixed clock by a frequency divider is controlled by the integrated value to vary a frequency. Every time a phase-shifting amount at the time becomes to correspond to one clock, a frequency division ratio at dividing the clock is changed from a predetermined frequency division ratio for one time of frequency division to absorb the phase shifting amount for one clock, thereby operating as a voltage controlled oscillator. Thus, the voltage controlled oscillator having the frequency accuracy of a fixed clock is realized.
    • 配置具有可变振荡频率的压控振荡器的晶体振荡器也用作用于产生固定频率的振荡器的晶体振荡器。 控制输入​​由积分器积分,由分频器分割固定时钟得到的分频信号的相位由积分值控制,以改变频率。 此时的每一时刻的移相量变成与1个时钟对应,分频时的分频比从分频一次的规定的分频比变化,以吸收一个时钟的相位移量,从而 作为压控振荡器工作。 因此,实现了具有固定时钟的频率精度的压控振荡器。
    • 38. 发明授权
    • FM signal oscillator circuit and modulation level control method
    • US06545557B2
    • 2003-04-08
    • US09880918
    • 2001-06-15
    • Minoru Nagata
    • Minoru Nagata
    • H03C302
    • H03C3/04H03B5/1215H03B5/1231H03B5/1243H03B5/1293
    • An FM signal oscillator circuit includes a resonator having a graded- or abrupt-junction variable capacitance diode that is producible through standard IC manufacturing processes but causes an inconstant modulation level. The FM signal oscillator circuit, therefore, is provided with a function of maintaining a constant modulation level irrespective of oscillation frequencies. Namely, to maintain a constant modulation level without regard to oscillation frequencies that change depending on a control voltage applied to the variable capacitance diode, the FM signal oscillator circuit employs a variable gain amplifier whose gain changes in response to the control voltage. The variable gain amplifier amplifies a modulating signal, and the amplified modulating signal is superimposed onto the control voltage. The superimposed signal is applied to the variable capacitance diode, and a driver of the FM signal oscillator circuit provides an FM signal whose modulation level is constant irrespective of the control voltage that may vary. With this configuration, the FM signal oscillator circuit is producible as an integrated circuit through standard IC manufacturing processes at low cost.