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1. 发明授权

US6072366A Receiver capable of outputting a high quality signal without regard to an input signal level 失效
标题翻译：能够输出高质量信号而不考虑输入信号电平的接收器
公开(公告)号：US6072366A
公开(公告)日：2000-06-06
申请号：US325646
申请日：1999-06-04
申请人： Masaaki Maeda , Zenkichi Sekine
发明人： Masaaki Maeda , Zenkichi Sekine
IPC分类号： H03K19/0185 , H03F3/08 , H03F3/45 , H03G3/20 , H03G3/30 , H04B10/07 , H04B10/2507 , H04B10/40 , H04B10/50 , H04B10/54 , H04B10/564 , H04B10/58 , H04B10/60 , H04B10/67 , H04B10/69 , H01J40/14
CPC分类号： H04B10/6931
摘要： A receiver includes a first amplifying circuit for amplifying an input signal to thereby output an amplified input signal. A reference voltage generating circuit has the same configuration as the first amplifying circuit and generates a reference signal having a reference voltage for the amplified input signal. A variable-gain amplifying circuit variably adjusts the gain of the level of a signal derived from the amplified input signal and reference signal. The variable-gain amplifying circuit includes a second amplifying circuit for amplifying the amplified input signal and reference signal for maintaining linearity to thereby output a pair of first differential signals and a pair of second differential signals having shifted levels. A first differential amplifier performs differential amplification based on the first differential signals. A second differential amplifier performs differential amplification based on the first differential signals with a higher gain than the first differential amplifier. A gain controller controls, based on the second differential signals, the gains of the first and second differential amplifiers with a control signal capable of varying gain allocation to said the two differential amplifiers. When the amplified input signal has an amplitude far greater than the reference signal, the gain controller causes a current to flow through only one of the two differential amplifiers. When the amplified input signal has an amplitude far smaller than the reference signal, the gain controller causes the two differential amplifiers to operate at the same time.
摘要翻译：接收机包括用于放大输入信号从而输出放大的输入信号的第一放大电路。参考电压发生电路具有与第一放大电路相同的配置，并产生具有用于放大的输入信号的参考电压的参考信号。可变增益放大电路可变地调节从放大的输入信号和参考信号导出的信号的电平的增益。可变增益放大电路包括用于放大放大的输入信号的第二放大电路和用于维持线性度的参考信号，从而输出一对第一差分信号和一对具有偏移电平的第二差分信号。第一差分放大器基于第一差分信号执行差分放大。第二差分放大器基于具有比第一差分放大器更高的增益的第一差分信号执行差分放大。增益控制器基于第二差分信号控制具有能够改变对两个差分放大器的增益分配的控制信号的第一和第二差分放大器的增益。当放大的输入信号具有远大于参考信号的幅度时，增益控制器使电流仅流过两个差分放大器中的一个。当放大的输入信号的幅度远小于参考信号时，增益控制器使两个差分放大器同时工作。

2. 发明授权

US07558584B2 Location reporting method and related mobile communication terminal 有权
公开(公告)号：US07558584B2
公开(公告)日：2009-07-07
申请号：US09980434
申请日：2001-03-30
申请人： Hiroyuki Yamamoto , Masaaki Maeda , Koichi Takahara , Masahiro Kaiwa , Yoichi Tanibayashi , Kaoru Nakajima , Junko Matsuo , Kazunori Kosuge , Katsutoshi Murata
发明人： Hiroyuki Yamamoto , Masaaki Maeda , Koichi Takahara , Masahiro Kaiwa , Yoichi Tanibayashi , Kaoru Nakajima , Junko Matsuo , Kazunori Kosuge , Katsutoshi Murata
IPC分类号： H04W24/00
CPC分类号： H04W4/02 , H04L29/12594 , H04L61/30 , H04L67/04 , H04L67/18 , H04W4/18 , H04W4/20 , H04W88/02
摘要： Menu data supplied from an IP server 500 to a mobile station 101 is embedded with a location information substitution data string “NULLAREA” together with a URL of a particular IP server 500. The mobile station 101, upon detection of the location information substitution data string from a menu data selected by the user, determines whether location information can be transmitted to the IP server 500. In the case where the determination is that the transmission is permitted, the mobile station 101 detects its location information and, after substituting the location information for the location information substitution data string, transmits the data to the IP server 500.

3. 发明授权

US06680988B1 Non-linear extraction circuit and clock extraction circuit 失效
标题翻译：非线性提取电路和时钟提取电路
公开(公告)号：US06680988B1
公开(公告)日：2004-01-20
申请号：US09531147
申请日：2000-03-17
申请人： Masaaki Maeda , Yoshikazu Fujita
发明人： Masaaki Maeda , Yoshikazu Fujita
IPC分类号： H04L702
CPC分类号： H04L7/033 , H03K3/0232 , H03L7/00 , H04L7/0087 , H04L7/02 , H04L7/027
摘要： For enabling a stable clock signal to be extracted from even an input signal of which the duty factor is made worse, there is presented a clock extraction circuit applicable to an optical signal receiver equipped in an apparatus for use in the optical data communication. The clock extraction circuit includes a rising edge differential circuit (12) for differentiating the input signal at the rising edge thereof, a first monostable multivibrator (13) for processing the output from the differential circuit (12), a second monostable multivibrator (14) for processing the output from the first monostable multivibrator (13), an OR gate (15) for carrying out the logical OR between the output signals from the first and second monostable multivibrators (13) and (14) and circuitry for variably varying output pulse width, which processes the result of the logical OR. With this configuration, it is made possible to extract a stable clock signal from an input signal even when the duty factor of the input signal is made worse.
摘要翻译：为了使稳定的时钟信号能够从占空因数变差的输入信号中提取出稳定的时钟信号，提出了一种适用于配备在用于光数据通信的装置中的光信号接收机的时钟提取电路。时钟提取电路包括用于在其上升沿区分输入信号的上升沿差分电路（12），用于处理差分电路（12）的输出的第一单稳态多谐振荡器（13），第二单稳态多谐振荡器（14）用于处理来自第一单稳态多谐振荡器（13）的输出的或门（15），用于执行来自第一和第二单稳态多谐振荡器（13）和（14）的输出信号之间的逻辑或运算，以及用于可变地改变输出脉冲 width，它处理逻辑OR的结果。利用这种配置，即使当输入信号的占空因数变差时，也可以从输入信号提取稳定的时钟信号。

4. 发明授权

US6157022A Bias voltage control circuitry for avalanche photodiode taking account of temperature slope of breakdown voltage of the diode, and method of adjusting the same 失效
标题翻译：考虑到二极管的击穿电压的温度斜率的雪崩光电二极管的偏置电压控制电路及其调整方法
公开(公告)号：US6157022A
公开(公告)日：2000-12-05
申请号：US188213
申请日：1998-11-09
申请人： Masaaki Maeda , Makoto Sudo
发明人： Masaaki Maeda , Makoto Sudo
IPC分类号： H03G3/30 , H01L31/02 , H03F1/30 , H03F3/08 , H04B10/07 , H04B10/2507 , H04B10/293 , H04B10/40 , H04B10/50 , H04B10/564 , H04B10/572 , H04B10/60 , H04B10/67 , H04B10/69 , H01J40/14
CPC分类号： H01L31/02027
摘要： Circuitry capable of controlling a bias voltage for an avalanche photodiode (APD) in accordance with the temperature slope of the breakdown voltage of the APD is disclosed. A reference voltage generating circuit sets a voltage implementing an optimal amplification ratio on an output terminal, and generates a reference voltage by taking account of the temperature slope of the breakdown voltage of the APD. The reference voltage is applied to one input of a voltage comparator. A setting circuit feeds to an adding circuit a preselected voltage for controlling the voltage on the output terminal to a value capable of implementing the optimal multiplication ratio. A temperature compensating circuit feeds to the adding circuit a voltage corresponding to the temperature slope of the above breakdown voltage. The temperature slope is representative of the variation of the breakdown voltage with respect to temperature. The adding circuit adds the two input voltages and delivers its output to the voltage comparator as the reference voltage. The voltage comparator produces a difference between the reference voltage and a voltage input from the output terminal and outputs a voltage control signal representative of the difference.
摘要翻译：公开了能够根据APD的击穿电压的温度斜率来控制雪崩光电二极管（APD）的偏置电压的电路。参考电压产生电路在输出端设置实现最佳放大率的电压，并通过考虑APD的击穿电压的温度斜率来产生参考电压。参考电压施加到电压比较器的一个输入端。设置电路向加法电路馈送用于将输出端子上的电压控制为能够实现最佳倍增比的值的预选电压。温度补偿电路向加法电路馈送与上述击穿电压的温度斜率相对应的电压。温度斜率代表击穿电压相对于温度的变化。加法电路将两个输入电压相加，并将其输出作为参考电压输出到电压比较器。电压比较器产生参考电压和从输出端输入的电压之间的差值，并输出代表差值的电压控制信号。

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