公开(公告)号：US07184738B2

公开(公告)日：2007-02-27

申请号：US10957624

申请日：2004-10-05

申请人： Shoji Otaka ,  Hiroshi Tsurumi ,  Hiroshi Yoshida ,  Syuichi Sekine ,  Hiroyuki Kayano ,  Tadahiko Maeda

发明人： Shoji Otaka ,  Hiroshi Tsurumi ,  Hiroshi Yoshida ,  Syuichi Sekine ,  Hiroyuki Kayano ,  Tadahiko Maeda

IPC分类号： H04B1/10 ,  H04B1/26

CPC分类号： H03D3/008 ,  H03F1/30 ,  H03F3/189 ,  H03F2200/294 ,  H03F2200/372 ,  H03F2200/504 ,  H03G3/3042 ,  H03L7/107 ,  H04B1/18 ,  H04B1/28 ,  H04B1/30 ,  H04B1/403 ,  H04B1/405

摘要： In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determined corresponding to the measured-radio wave environment. The power is controlled corresponding to the performance of the radio apparatus. Thus, the power consumption is decreased. In addition, the efficiency of the output power is improved. In the radio apparatus, the current consumption of a power amplifier PA is measured. A matching circuit (LNA or MIX) of the antenna is adjusted with the measured result so as to decrease an antenna loss. In the radio apparatus, a DC offset is removed from the transmitted power and the reflected wave. When the DC offset is removed using an AC coupling capacitor, the deterioration of the frequency characteristic of the receiving portion is compensated with a capacitor in a digital signal process. In the radio apparatus, a transmission power detecting portion is structured as an IC chip. The transmission power detecting portion detects the transmission power corresponding to leakage currents in the power supply of the IC chip and the ground. Thus, when the power is detected, a power loss is suppressed. Consequently, the power consumption of the radio apparatus can be decreased.

摘要翻译： 在无线电设备中，空白信道搜索状态的合成器的环路滤波器的频带比通信状态的频带窄。 另外，测量无线电波环境。 根据测量的无线电波环境确定无线电设备所需的特性。 根据无线电设备的性能来控制功率。 因此，功耗降低。 此外，输出功率的效率提高。 在无线电设备中，测量功率放大器PA的电流消耗。 利用测量结果调整天线的匹配电路（LNA或MIX），以减少天线损耗。 在无线电设备中，从发射功率和反射波中去除DC偏移。 当使用AC耦合电容器去除DC偏移时，在数字信号处理中用电容器补偿接收部分的频率特性的劣化。 在无线电设备中，传输功率检测部分被构造为IC芯片。 发送功率检测部分检测与IC芯片和地面的电源中的泄漏电流相对应的发送功率。 因此，当检测到电力时，功率损失被抑制。 因此，可以减少无线电设备的功耗。

公开(公告)号：US07075345B2

公开(公告)日：2006-07-11

申请号：US10207024

申请日：2002-07-30

申请人： Toshiyuki Umeda ,  Shoji Otaka ,  Tetsuro Itakura

发明人： Toshiyuki Umeda ,  Shoji Otaka ,  Tetsuro Itakura

IPC分类号： H03B19/00

CPC分类号： H03D7/1441 ,  H03D7/1433 ,  H03D7/1458 ,  H03D2200/0033 ,  H03D2200/0043 ,  H03D2200/0084

摘要： A frequency converter converts a first current signal having a first frequency into a second current signal having a second frequency different fro the first frequency. The frequency converter includes an adder and a switching circuit. The adder adds the first current signal and a reference current signal to output a third current signal. The switching circuit passes only that portion of the third current signal larger in magnitude than a threshold current to output the second current signal.

摘要翻译： 变频器将具有第一频率的第一电流信号转换成具有与第一频率不同的第二频率的第二电流信号。 变频器包括加法器和开关电路。 加法器将第一电流信号和参考电流信号相加以输出第三电流信号。 开关电路仅通过第三电流信号的大于阈值电流的部分，以输出第二电流信号。

公开(公告)号：US06940339B2

公开(公告)日：2005-09-06

申请号：US11003734

申请日：2004-12-06

申请人： Shoji Otaka

发明人： Shoji Otaka

IPC分类号： G05F3/20 ,  G05F3/00 ,  H04B1/16

CPC分类号： G05F3/205

摘要： A mobility proportion current generator comprises a voltage adder including a first MOS transistor, the voltage adder adding a voltage whose temperature dependency is small with respect to the mobility and a threshold voltage of the first MOS transistor to output a sum voltage, and a second MOS transistor including whose drain terminal is connected to a constant potential point, the sum voltage of the voltage adder being applied between the gate terminal and the source terminal of the second MOS transistor to output a current proportional to the mobility being output from the drain terminal thereof.

公开(公告)号：US06816712B2

公开(公告)日：2004-11-09

申请号：US09990301

申请日：2001-11-23

申请人： Shoji Otaka ,  Hiroshi Tsurumi ,  Hiroshi Yoshida ,  Syuichi Sekine ,  Hiroyuki Kayano ,  Tadahiko Maeda

发明人： Shoji Otaka ,  Hiroshi Tsurumi ,  Hiroshi Yoshida ,  Syuichi Sekine ,  Hiroyuki Kayano ,  Tadahiko Maeda

IPC分类号： H04B144

CPC分类号： H03D3/008 ,  H03F1/30 ,  H03F3/189 ,  H03F2200/294 ,  H03F2200/372 ,  H03F2200/504 ,  H03G3/3042 ,  H03L7/107 ,  H04B1/18 ,  H04B1/28 ,  H04B1/30 ,  H04B1/403 ,  H04B1/405

摘要： In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determined corresponding to the measured radio wave environment. The power is controlled corresponding to the performance of the radio apparatus. Thus, the power consumption is decreased. In addition, the efficiency of the output power is improved. In the radio apparatus, the current consumption of a power amplifier PA is measured. A matching circuit (LNA or MIX) of the antenna is adjusted with the measured result so as to decrease an antenna loss. In the radio apparatus, a DC offset is removed from the transmitted power and the reflected wave. When the DC offset is removed using an AC coupling capacitor, the deterioration of the frequency characteristic of the receiving portion is compensated with a capacitor in a digital signal process. In the radio apparatus, a transmission power detecting portion is structured as an IC chip. The transmission power detecting portion detects the transmission power corresponding to leakage currents in the power supply of the IC chip and the ground. Thus, when the power is detected, a power loss is suppressed. Consequently, the power consumption of the radio apparatus can be decreased.

摘要翻译： 在无线电设备中，空白信道搜索状态的合成器的环路滤波器的频带比通信状态的频带窄。 另外，测量无线电波环境。 根据测得的无线电波环境确定无线电设备所必需的特性。 根据无线电设备的性能来控制功率。 因此，功耗降低。 此外，输出功率的效率提高。 在无线电设备中，测量功率放大器PA的电流消耗。 利用测量结果调整天线的匹配电路（LNA或MIX），以减少天线损耗。 在无线电设备中，从发射功率和反射波中去除DC偏移。 当使用AC耦合电容器去除DC偏移时，在数字信号处理中用电容器补偿接收部分的频率特性的劣化。 在无线电设备中，传输功率检测部分被构造为IC芯片。 发送功率检测部分检测与IC芯片和地面的电源中的泄漏电流相对应的发送功率。 因此，当检测到电力时，功率损失被抑制。 因此，可以减少无线电设备的功耗。

公开(公告)号：US06563383B1

公开(公告)日：2003-05-13

申请号：US09696972

申请日：2000-10-27

申请人： Shoji Otaka ,  Osamu Watanabe

发明人： Shoji Otaka ,  Osamu Watanabe

IPC分类号： H03F345

CPC分类号： H03G3/3042 ,  H03F3/45183 ,  H03F2200/294 ,  H03F2200/372 ,  H03G3/04 ,  H03G7/06

摘要： A variable gain circuit includes a variable gain amplifier which receives an input signal, outputs an amplified signal, and includes a first field-effect transistor, a gain control signal compensation circuit which outputs a gain control signal for controlling the gain of the variable gain amplifier and includes a second field-effect transistor, and a gain deviation correction circuit which corrects a gain deviation based on the variable gain amplifier and the gain control signal compensation circuit.

摘要翻译： 可变增益电路包括可变增益放大器，其接收输入信号，输出放大信号，并且包括第一场效应晶体管，增益控制信号补偿电路，其输出用于控制可变增益放大器的增益的增益控制信号 并且包括第二场效应晶体管，以及基于可变增益放大器和增益控制信号补偿电路校正增益偏差的增益偏差校正电路。

公开(公告)号：US06477360B1

公开(公告)日：2002-11-05

申请号：US09518879

申请日：2000-03-06

申请人： Osamu Watanabe ,  Takafumi Yamaji ,  Hiroshi Tanimoto ,  Shoji Otaka

发明人： Osamu Watanabe ,  Takafumi Yamaji ,  Hiroshi Tanimoto ,  Shoji Otaka

IPC分类号： H04B126

CPC分类号： H03D7/1433 ,  H03D7/1425 ,  H03D7/1441

摘要： A frequency converter includes a multiplying circuit, a load circuit, and an output buffer circuit. The multiplying circuit is arranged to multiply an RF signal and an LO signal and output a difference frequency signal with a frequency, which is the difference between the frequencies of the two signals, from its output terminal. The load circuit is arranged to connect the output terminal of the multiplying circuit to a power supply. The output buffer circuit is arranged to have an input terminal connected to the output terminal of the multiplying circuit, and an output terminal for outputting a signal to the next stage. A notch circuit for removing an undesired signal frequency component is combined in the load circuit. The notch circuit has an impedance characteristic in which the impedance is abruptly reduced to provide a valley point at the undesired signal frequency.

摘要翻译： 变频器包括乘法电路，负载电路和输出缓冲电路。 乘法电路被布置为将RF信号和LO信号相乘，并以其输出端子的两个信号的频率之间的频率的频率输出差分频率信号。 负载电路被布置成将乘法电路的输出端子连接到电源。 输出缓冲电路被配置为具有连接到乘法电路的输出端子的输入端子和用于向下一级输出信号的输出端子。 用于去除不需要的信号频率分量的陷波电路在负载电路中组合。 陷波电路具有阻抗特性，其中阻抗突然减小以在不期望的信号频率处提供谷点。

公开(公告)号：US06215989B1

公开(公告)日：2001-04-10

申请号：US09471493

申请日：1999-12-23

申请人： Shoji Otaka

发明人： Shoji Otaka

IPC分类号： H04B106

CPC分类号： H03G1/0023

摘要： The variable gain circuit comprises a gain control signal correction circuit which corrects a gain control signal Vx to obtain a corrected gain control signal Vy and a variable gain amplifier which controls the gain in accordance with the corrected gain control signal Vy. The gain control signal correction circuit has input/output characteristic of: Vy=Vt×ln{exp (b×Vx/Vt)−1}, where, Vt is a thermal voltage, and b≧0. The transfer function (gain) from the input signal current Isig to the output signal current Ia of the variable gain amplifier is represented by: Ia/Isig=1/[1+exp (Vx/Vt)]. Thus, the gain can be controlled in exponential function to the gain control signal Vx.

摘要翻译： 可变增益电路包括增益控制信号校正电路，其校正增益控制信号Vx以获得校正的增益控制信号Vy，以及可变增益放大器，其根据校正后的增益控制信号Vy控制增益。 增益控制信号校正电路具有：Vy = Vtxln {exp（bxVx / Vt）-1}的输入/输出特性，其中，Vt是热电压，b> = 0。 从输入信号电流Isig到可变增益放大器的输出信号电流Ia的传递函数（增益）表示为：Ia / Isig = 1 / [1 + exp（Vx / Vt）]。 因此，可以以增益控制信号Vx的指数函数来控制增益。

公开(公告)号：US5796286A

公开(公告)日：1998-08-18

申请号：US524526

申请日：1995-09-07

申请人： Shoji Otaka

发明人： Shoji Otaka

IPC分类号： H03H7/24 ,  H03H11/24 ,  H03K5/08

CPC分类号： H03H11/245

摘要： A GaAs MESFET that turns on and off to control the gain is connected to an attenuation circuit composed of a plurality of resistors connected between the input and output terminals and a reference potential terminal. By injecting a specific amount of current into the gate of the FET, the voltage between the gate and the source and drain is turned into the ON-state voltage of the Schottky junction determined by the injected current and the cross section of the FET, thereby turning on the FET. By applying a voltage lower than the threshold voltage between the gate and the source and drain of FET, the FET is turned on.

摘要翻译： 接通和关断以控制增益的GaAs MESFET连接到由连接在输入和输出端子之间的多个电阻器和参考电位端子组成的衰减电路。 通过向FET的栅极注入特定量的电流，栅极和源极和漏极之间的电压变为由注入电流和FET的截面确定的肖特基结的导通电压，由此 打开FET。 通过在FET的栅极和源极和漏极之间施加低于阈值电压的电压，FET被导通。

公开(公告)号：US5736840A

公开(公告)日：1998-04-07

申请号：US625368

申请日：1996-04-01

申请人： Shoji Otaka ,  Hiroshi Tanimoto

发明人： Shoji Otaka ,  Hiroshi Tanimoto

IPC分类号： G05F3/22 ,  H03D7/16 ,  H03H11/22 ,  H04L27/20 ,  G05F3/00

CPC分类号： G05F3/22 ,  H03D7/165 ,  H03H11/22 ,  H04L27/20

摘要： A local signal of a predetermined frequency is supplied to an input terminal of a local signal input section. The local signal is applied to a control input terminal of a variable current supply and, in accordance with the local signal, a current is output from a variable current supply and sent to a phase-shifting section. The phase-shifting section includes two resonance circuits each comprised of a capacitor and inductor. The two resonance circuits are connected in parallel with a linear element constituting the local signal input section to output first and second output signals of the same frequency as that of the local signal and whose phases are shifted by a predetermined amount. The respective output signals of the phase-shifting section are output to a next stage through a signal output section comprised of two sets each of a current supply and transistor.

摘要翻译： 将预定频率的本地信号提供给本地信号输入部分的输入端。 本地信号被施加到可变电流源的控制输入端子，并且根据本地信号，从可变电流源输出电流并发送到相移部分。 相移部分包括两个谐振电路，每个谐振电路由电容器和电感器组成。 两个谐振电路与构成本地信号输入部的线状元件并联连接，输出与本地信号相同频率的第一和第二输出信号，并将相位偏移预定量。 相移部分的各个输出信号通过由电流源和晶体管组成的两组的信号输出部分输出到下一级。

公开(公告)号：US5650714A

公开(公告)日：1997-07-22

申请号：US303815

申请日：1994-09-09

申请人： Shoji Otaka ,  Hiroshi Tanimoto

发明人： Shoji Otaka ,  Hiroshi Tanimoto

IPC分类号： H03H7/18 ,  G05F3/22 ,  H03D7/16 ,  H03H11/22 ,  H04L27/20 ,  H04L27/36 ,  G05F3/00

CPC分类号： H03D7/165 ,  G05F3/22 ,  H03H11/22 ,  H04L27/20

摘要： A local signal of preset frequency is supplied to an input terminal of a signal input section. The local signal is supplied to a control input terminal of a variable current source, a current corresponding to the local signal is output from the variable current source, and the current is supplied to a phase shifting section. The phase shifting section includes an integrator constructed by a capacitor and a resistor connected in series and a differentiator constructed by a resistor and a capacitor connected in parallel. As parallely connecting the phase shifting circuit with a linear element of which the signal input section consists, the phase shifting section outputs first and second output signals which has the same frequency as the local signal and whose phases are different from each other by 90.degree.. The output signals of the phase shifting section are output to the next stage via an orthogonal signal output section constructed by current source and transistors.

摘要翻译： 预设频率的本地信号被提供给信号输入部分的输入端。 本地信号被提供给可变电流源的控制输入端，从可变电流源输出对应于本地信号的电流，并将电流提供给相移部分。 相移部分包括由串联的电容器和电阻器构成的积分器，以及由电阻器和并联连接的电容器构成的微分器。 由于相移电路与信号输入部分所构成的线性元件平行连接，所以相移部输出与本地信号相同频率的第一和第二输出信号，其相位彼此相差90度。 相移部分的输出信号通过由电流源和晶体管构成的正交信号输出部分输出到下一级。