公开(公告)号：US06559725B1

公开(公告)日：2003-05-06

申请号：US09611084

申请日：2000-07-06

申请人： Makoto Akiya

发明人： Makoto Akiya

IPC分类号： H03L7089

CPC分类号： H03L7/1972 ,  H03L7/0891 ,  H03L7/095 ,  Y10S331/02

摘要： A phase noise reduction system of a frequency synthesizer for obtaining an arbitrary frequency oscillation by locking a reference oscillation frequency of a reference oscillator to an oscillation frequency of a voltage controlled oscillator has a variable frequency divider for voltage controlled oscillator which divides an oscillation frequency of the voltage controlled oscillator, a variable frequency divider for reference oscillator which divides a reference oscillation frequency of the reference oscillator, and a lock detection section which initially sets a common small number of frequency division to the variable frequency divider for voltage controlled oscillator and the variable frequency divider for reference oscillator, respectively, subsequently detects locking of frequency, and switches the setting of number of frequency division from the small number of frequency division to a larger number of frequency division. The phase noise reduction system is capable of switching to a state of better phase noise in a shorter period of time thus enabling a high-speed locking.

摘要翻译： 用于通过将参考振荡器的参考振荡频率锁定到压控振荡器的振荡频率来获得任意频率振荡的频率合成器的相位降噪系统具有用于压控振荡器的可分频器，该可分频器将 压控振荡器，用于分频参考振荡器的参考振荡频率的参考振荡器的可变分频器，以及锁定检测部分，其初始设置与压控振荡器的可变分频器的共同小数量的分频，并且可变频率 用于参考振荡器的分频器分别随后检测频率锁定，并将分频数的设置从小数量的分频切换到更大数量的分频。 相位降噪系统能够在更短的时间段内切换到更好的相位噪声状态，从而实现高速锁定。

公开(公告)号：US5847539A

公开(公告)日：1998-12-08

申请号：US895633

申请日：1997-07-17

申请人： Makoto Akiya

发明人： Makoto Akiya

IPC分类号： H02J7/00 ,  H01M10/46 ,  H02J7/02

CPC分类号： H02J7/027

摘要： An electrical charging device for preventing an erroneous electrical charging of a non-rechargeable battery includes a battery cell voltage sensing circuit and a switch control circuit for controlling an electrical charging in response to a presence or a non-presence of a battery cell voltage detected by this circuit. When a battery case houses one type of primary batteries, the switch control circuit prevents electrical charging when the voltage is detected, but permits electrical charging when the voltage is not detected. For another type of primary battery, the switch control circuit prevents electrical charging when the voltage is detected and it prevents electrical charging when the voltage is not detected.

摘要翻译： 用于防止不可再充电电池的错误充电的充电装置包括电池单元电压检测电路和开关控制电路，用于响应于存在或不存在由 这个电路。 当电池盒容纳一种一次电池时，开关控制电路在检测到电压时可防止充电，但是当未检测到电压时允许充电。 对于另一种类型的一次电池，当检测到电压时，开关控制电路防止充电，并且当没有检测到电压时防止充电。

公开(公告)号：US06236841B1

公开(公告)日：2001-05-22

申请号：US09177003

申请日：1998-10-22

申请人： Makoto Akiya

发明人： Makoto Akiya

IPC分类号： H04B102

CPC分类号： H04W52/42 ,  H01Q3/24 ,  H01Q23/00 ,  H03G3/3042 ,  H03G3/3047 ,  H04B7/0608 ,  H04B7/0805 ,  H04W52/52

摘要： A transmission power control circuit includes a plurality of antennas, a plurality of reference voltages provided for the plurality of antennas, respectively, and an amplifier section for amplifying a transmission signal to produce a transmission output signal. A first switch selects one of the plurality of antennas in response to a switch control signal such that the transmission output signal is outputted from the selected antenna. A detecting unit detects a detection voltage for the transmission output signal. A second switch selects one of the plurality of reference voltages in response to the switch control signal. An error correction circuit controls the amplifier section based on the detection voltage and the selected reference voltage such that the transmission output signal has a predetermined power level.

摘要翻译： 发送功率控制电路分别包括多个天线，分别为多个天线提供的多个参考电压以及用于放大发送信号以产生发送输出信号的放大器部分。 第一开关响应于开关控制信号选择多个天线中的一个，使得从所选天线输出发送输出信号。 检测单元检测发送输出信号的检测电压。 第二开关响应于开关控制信号选择多个参考电压中的一个。 误差校正电路基于检测电压和选择的参考电压来控制放大器部分，使得发送输出信号具有预定的功率电平。

公开(公告)号：US5752171A

公开(公告)日：1998-05-12

申请号：US651495

申请日：1996-05-22

申请人： Makoto Akiya

发明人： Makoto Akiya

IPC分类号： H03G3/20 ,  H03G3/30 ,  H04B1/04

CPC分类号： H03G3/3042

摘要： A transmission level control circuit includes a negative feedback control loop and a level setting controller. A first amplifier amplifies an input signal by a variable amplification factor to produce a first signal. A second amplifier receives the first signal and produces a second signal according to a control signal such that the first signal is amplified when the control signal is in a first state and the first signal is attenuated when the control signal is in a second state. An output signal produced by a third amplifier amplifying the second signal is monitored by a detector which detects an output level of the output signal. A controller performs the negative feedback control when the control signal is in the first state, and performs the level setting control such that the variable amplification factor is set so as to set the output level at a relatively lower level when the control signal is in the second state.

摘要翻译： 发送电平控制电路包括负反馈控制回路和电平设定控制器。 第一放大器通过可变放大因子放大输入信号以产生第一信号。 第二放大器接收第一信号并根据控制信号产生第二信号，使得当控制信号处于第一状态时第一信号被放大，并且当控制信号处于第二状态时第一信号被衰减。 由放大第二信号的第三放大器产生的输出信号由检测输出信号的输出电平的检测器监视。 当控制信号处于第一状态时，控制器执行负反馈控制，并且执行电平设置控制，使得设置可变放大系数，以便当控制信号处于第一状态时将输出电平设置在较低电平 第二个状态。

公开(公告)号：US20090011733A1

公开(公告)日：2009-01-08

申请号：US11813550

申请日：2006-01-12

申请人： Makoto Akiya

发明人： Makoto Akiya

IPC分类号： H03J7/18 ,  H04B1/26

CPC分类号： H04B1/0075 ,  H03J1/0083 ,  H04B1/28

摘要： A PLL circuit (11) is provided with an oscillator for reception at a frequency band (A), and an oscillator for reception at a frequency band (B). A PLL circuit (12) is provided with an oscillator for reception at the frequency band (B), and an oscillator for reception at the frequency band (A). In the case of searching at the frequency band (A), the PLL circuit (11) and the PLL circuit (12) are oscillated at different frequencies within the frequency band (A) at the same time. After locking the PLL circuit (11), output from the PLL circuit (11) is inputted to a mixer (15) and an intensity of a receiving signal is measured, then, a signal to be inputted to the mixer (15) is switched to an output from the PLL circuit (12) and an intensity of a receiving signal is measured.

摘要翻译： PLL电路（11）设置有用于在频带（A）处接收的振荡器和用于在频带（B）处接收的振荡器。 PLL电路（12）设置有用于在频带（B）处接收的振荡器和用于在频带（A）处接收的振荡器。 在频带（A）的情况下，PLL电路（11）和PLL电路（12）同时在频带（A）内以不同的频率振荡。 在锁定PLL电路（11）之后，从PLL电路（11）的输出被输入到混频器（15）并测量接收信号的强度，然后切换输入​​到混频器（15）的信号 到PLL电路（12）的输出，并测量接收信号的强度。

公开(公告)号：US06998915B2

公开(公告)日：2006-02-14

申请号：US10345368

申请日：2003-01-16

申请人： Makoto Akiya

发明人： Makoto Akiya

IPC分类号： H01Q11/12 ,  H04B1/04

CPC分类号： H04B1/005 ,  H04B1/44

摘要： An apparatus for switching a matching circuit in a mobile communication terminal includes a PIN diode connected in parallel to an RF signal input and output line to be turned on and off to connect and disconnect an impedance matching-element to the RF signal input and output line in accordance with a frequency band switching-signal, and a bias circuit for generating a bias voltage applied to the PIN diode in accordance with the frequency band switching-signal, thereby shifting an amplitude of an RF signal to a positive side at an off-time of the PIN diode.

公开(公告)号：US06329880B2

公开(公告)日：2001-12-11

申请号：US09761588

申请日：2001-01-18

申请人： Makoto Akiya

发明人： Makoto Akiya

IPC分类号： H03F152

CPC分类号： H03F1/56 ,  H03F1/0261

摘要： An object of the present invention is to allow the miniaturization of a mobile communication equipment and the reduction of consumption power, and to improve the electrical characteristics of a final stage amplifier. An inputted RF signal is amplified to a specified transmission output by a final stage amplifier, the output power and a reflected wave generated by mismatching between an output impedance of the final stage amplifier and a load impedance connected to an output side of the final stage amplifier are detected by a directional coupler. Two switches are selectively switched in a time division manner, a DC voltage corresponding to the reflected wave is selected, a comparator compares a threshold voltage with the DC voltage, a switch is switched by an output of the comparator outputted in accordance with the comparison, and gate voltages are selectively applied to the final stage amplifier.

公开(公告)号：US5998962A

公开(公告)日：1999-12-07

申请号：US96002

申请日：1998-06-11

申请人： Makoto Akiya

发明人： Makoto Akiya

IPC分类号： H01M10/44 ,  H01M10/48 ,  H02J7/00 ,  H01M10/46

CPC分类号： H02J7/0029

摘要： In a portable electronic equipment usable with both primary and secondary batteries, discrimination between primary and secondary batteries is carried out utilizing a difference in discharge characteristics between the primary and secondary batteries. Specifically, a previously acquired battery voltage is compared with a battery voltage after a given period of time, and whether the battery is a primary battery or a secondary battery is determined based on the voltage difference. Charging operation is controlled based on the discrimination results, enabling the secondary battery to be more surely charged.

摘要翻译： 在可用于一次电池和二次电池的便携式电子设备中，一次电池和二次电池之间的放电特性的差异来进行一次电池和二次电池之间的区别。 具体地说，将预先取得的蓄电池电压与规定时间后的电池电压进行比较，根据电压差判定电池是一次电池还是二次电池。 基于鉴别结果控制充电操作，使得二次电池更可靠地充电。