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    • 1. 发明授权
    • Digital control type oscillation circuit of portable telephone, crystal
resonator oscillation frequency calculating method, and outputfrequency
correcting method
    • 便携式电话的数字控制型振荡电路,晶体振荡器振荡频率计算方法和输出频率校正方法
    • US5757244A
    • 1998-05-26
    • US606072
    • 1996-02-23
    • Youji NonakaYuji IshidaYouji SuwaToshikazu Hiramoto
    • Youji NonakaYuji IshidaYouji SuwaToshikazu Hiramoto
    • H03D7/16H03L1/02
    • H03L1/025H03D7/165H03L1/028
    • In a portable telephone which uses a CPU, a memory, a temperature sensor, a D/A converter, and an A/d converter as control elements, and which has an oscillation circuit including a crystal resonator and a variable-capacitance diode, temperature compensation of the output frequency is made by using these existing control elements. The memory is previously stored with control information for correcting an output frequency drift of the portable telephone caused by a temperature change. The temperature of the oscillation circuit is detected with the temperature sensor and converted into a digital value in the A/D converter. The CPU reads control information corresponding to the detected temperature from the memory and applies it to the variable-capacitance diode of the oscillation circuit through the D/A converter, thereby maintaining the output frequency at a constant level. Also disclosed is a method of efficiently calculating an oscillation frequency of a crystal resonator with a reduced number of points of measurement for a temperature characteristic of the crystal resonator. A method of accurately carrying out the above-described temperature compensation is also disclosed.
    • 在使用CPU,存储器,温度传感器,D / A转换器和A / D转换器作为控制元件的便携式电话中,具有包括晶体谐振器和可变电容二极管的振荡电路,温度 通过使用这些现有的控制元件来补偿输出频率。 存储器预先存储有用于校正由温度变化引起的便携式电话的输出频率漂移的控制信息。 用温度传感器检测振荡电路的温度,并在A / D转换器中转换为数字值。 CPU从存储器读取对应于检测到的温度的控制信息,并通过D / A转换器将其施加到振荡电路的可变电容二极管,从而将输出频率保持在恒定水平。 还公开了一种利用晶体谐振器的温度特性减少的测量点数来有效地计算晶体谐振器的振荡频率的方法。 还公开了一种精确地执行上述温度补偿的方法。
    • 5. 发明申请
    • Wireless Communication Apparatus and Operating Frequency Control Method of Power Conversion Apparatus
    • 电力转换装置的无线通信装置及工作频率控制方法
    • US20070195722A1
    • 2007-08-23
    • US11466924
    • 2006-08-24
    • Toshikazu Hiramoto
    • Toshikazu Hiramoto
    • H04B7/185
    • H04B15/06
    • In order to decrease a negative influence on other electric apparatuses because of conduction noise occurring from a wireless communication apparatus along with preventing increasing cost and an increase in size of communication module, the wireless communication apparatus includes: a high accuracy oscillator which is applied for communication operation of the wireless communication portion, and which generates a predetermined clock signal which becomes a predetermined frequency by dividing at a predetermined division rate; a low accuracy oscillator which has a lower accuracy than the high accuracy oscillator, and which generates a first clock signal close to the predetermined frequency; a frequency divider which divides the operation clock signal at a predetermined division rate, and generates a second clock signal; and a control portion which conducts a switching operation in which the operation clock signal supplied to the power conversion apparatus is switched to the second clock signal when the wireless communication portion receives an annunciation signal, and to the first clock signal when receiving of the annunciation signal is suspended.
    • 为了减少由于无线通信装置发生的传导噪声而对其他电气设备的负面影响,同时防止通信模块的成本增加和尺寸的增加,无线通信装置包括:应用于通信的高精度振荡器 无线通信部分的操作,并且通过以预定的分频率分频而产生成为预定频率的预定时钟信号; 低精度振荡器,其精度低于高精度振荡器,并且产生接近预定频率的第一时钟信号; 分频器,以预定的分频率对运算时钟信号进行分频,生成第二时钟信号; 以及控制部分,当无线通信部分接收到通知信号时,进行将提供给电力转换装置的操作时钟信号切换到第二时钟信号的切换操作,以及当接收到通知信号时的第一时钟信号 被暂停。