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    • 9. 发明授权
    • FM modulator
    • FM调制器
    • US07587180B2
    • 2009-09-08
    • US11583176
    • 2006-10-19
    • Masakatsu MaedaKaoru Ishida
    • Masakatsu MaedaKaoru Ishida
    • H04B1/04
    • H03C3/0925H03C3/0941H03C3/095H03C3/0966H03C3/0983
    • An FM modulator measuring an f-V characteristic of a voltage controlled oscillator in a reduced time period. In the FM modular a characteristic measurement time control section 110 notifies a correction section 108 of a time at which a measurement of the f-V characteristic of a voltage controlled oscillator 103 is to start and a time at which the measurement of the f-V characteristic of the voltage controlled oscillator 103 is to and while a carrier wave frequency is being changed to a predetermined frequency. Thus, the correction section 108 measures the f-V characteristic of the voltage controlled oscillator 103 in a reduced time period.
    • 在缩短的时间周期内测量压控振荡器的f-V特性的FM调制器。 在FM模块中,特性测量时间控制部分110向校正部分108通知压控振荡器103的fV特性的测量开始的时间和电压的fV特性的测量的时间 受控振荡器103正在将载波频率改变为预定频率。 因此,校正部分108在减小的时间段内测量压控振荡器103的f-V特性。
    • 10. 发明申请
    • SEMICONDUCTOR APPARATUS AND RADIO CIRCUIT APPARATUS USING THE SAME
    • 使用其的半导体装置和无线电电路装置
    • US20090115466A1
    • 2009-05-07
    • US11994542
    • 2006-06-27
    • Masakatsu Maeda
    • Masakatsu Maeda
    • H03B19/00
    • H04B1/30H03L7/183
    • A semiconductor apparatus includes a signal source 7 that outputs a signal of predetermined frequency, a frequency divider 15 that receives the output signal of the signal source and is capable of switching the output signal to two or more frequency division ratios, a delta-sigma modulator 16 that controls the frequency division ratio of the frequency divider, and a bandpass filter 17 that receives an output of the frequency divider. The frequency of the input signal of the frequency divider is divided by the frequency division ratio controlled by the delta-sigma modulator, and quantization noise appearing in the output of the frequency divider generated by the delta-sigma modulator is attenuated with the bandpass filter. The semiconductor apparatus easily can convert a signal output by a single signal source to a signal of predetermined frequency and supply a plurality of signals of predetermined frequency using a simple configuration with reduced chip size.
    • 半导体装置包括输出预定频率的信号的信号源7,接收信号源的输出信号并且能够将输出信号切换到两个或更多个分频比的分频器15,Δ-Σ调制器 16,其控制分频器的分频比,以及带通滤波器17,其接收分频器的输出。 分频器的输入信号的频率除以由Δ-Σ调制器控制的分频比,并且由Δ-Σ调制器产生的分频器的输出中出现的量化噪声被带通滤波器衰减。 半导体装置可以容易地将由单个信号源输出的信号转换为预定频率的信号,并且使用具有减小的芯片尺寸的简单配置来提供预定频率的多个信号。