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公开(公告)号：US5995819A
公开(公告)日：1999-11-30
申请号：US755468
申请日：1996-11-22
申请人： Takafumi Yamaji , Osamu Watanabe , Hiroshi Tanimoto , Tetsuro Itakura , Shoji Otaka , Ryuichi Fujimoto
发明人： Takafumi Yamaji , Osamu Watanabe , Hiroshi Tanimoto , Tetsuro Itakura , Shoji Otaka , Ryuichi Fujimoto
CPC分类号： H03F3/45085 , H03D7/00 , H03D7/1408 , H03D7/1433 , H03D7/1441 , H03D7/1458 , H03D7/1475 , H03D2200/0007 , H03D2200/0025 , H03D2200/0047 , H03D2200/009
摘要： A frequency converter includes: a signal synthesizer element for inputting first and second input signals to synthesize these signals and for outputting a synthesized signal, from which noises even times as large as the frequency of the second input signal are removed; an amplitude limitation amplifier element, composed of a differential amplifier circuit, for amplifying the synthesized signal outputted from the signal synthesizer element to output an amplified signal having a constant amplitude; and a filter for inputting the amplified signal outputted from the amplitude limitation amplifier element, to remove an unnecessary signal component to produce an output a baseband signal including only a desired signal component. In addition, a radio receiver using the frequency converter of such a construction is designed to input the output of a local oscillator to a variable attenuator or a variable gain amplifier, to input the output of the variable attenuator or the variable gain amplifier as the first input signal to the frequency converter so as to perform the gain control. Thus, not only is self-mixing, a common problem in direct conversion receivers, prevented, but also, because a smaller local oscillation driving signal is required, power consumption is significantly reduced.
摘要翻译： 一种频率转换器，包括：信号合成器元件，用于输入第一和第二输入信号以合成这些信号并输出合成信号，从该信号合成信号除去除了第二输入信号的频率以上的噪声; 幅度限制放大器元件，由差分放大电路组成，用于放大从信号合成器元件输出的合成信号，以输出具有恒定幅度的放大信号; 以及滤波器，用于输入从幅度限制放大器元件输出的放大信号，以去除不必要的信号分量以产生仅包括所需信号分量的基带信号。 此外，使用这种结构的变频器的无线电接收机被设计成将本地振荡器的输出输入到可变衰减器或可变增益放大器，以将可变衰减器或可变增益放大器的输出作为第一 输入到变频器的信号，以进行增益控制。 因此，不仅自发混合，直接转换接收器中的常见问题被阻止，而且由于需要较小的本地振荡驱动信号，所以功耗显着降低。
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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。
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公开(公告)号：US07031684B2
公开(公告)日：2006-04-18
申请号：US09950630
申请日：2001-09-13
申请人： Shoji Otaka , Takafumi Yamaji
发明人： Shoji Otaka , Takafumi Yamaji
CPC分类号： H03F3/45183 , H03F2203/45246 , H03G1/0029 , H03G7/06
摘要： A variable gain amplifier device controlled by a first gain control signal comprises a gain controlled amplifier having a gain and including a differential pair of first and second MOS type transistors configured to operate in a weak inversion region; and a control signal converter configured to convert the first gain control signal into a second gain control signal, and supply the second gain control signal to the gain controlled amplifier to exponentially vary the gain with respect to the first gain control signal.
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公开(公告)号：US08958767B2
公开(公告)日：2015-02-17
申请号：US13422636
申请日：2012-03-16
申请人： Shoji Otaka , Takafumi Yamaji , Tsutomu Sugawara , Yasuhiko Tanabe , Masahiro Hosoya , Hiroki Sakurai
发明人： Shoji Otaka , Takafumi Yamaji , Tsutomu Sugawara , Yasuhiko Tanabe , Masahiro Hosoya , Hiroki Sakurai
CPC分类号： H04W52/0274 , H03L7/0802 , H03L7/1976 , H03L2207/50 , H04L25/0292 , H04L27/38 , H04L27/3818 , H04W52/0229 , Y02D70/142
摘要： A radio apparatus includes an antenna; an amplifier that amplifies a radio signal, received via the antenna; a first mixer that frequency converts the amplified radio signal to generate a first analog signal; a first A/D converter that converts the first analog signal to generate a first digital signal; a second mixer that frequency converts the amplified signal to generate a second analog signal; a second A/D converter means that converts the second analog signal to generate a second digital signal; a demodulator means that demodulates the first and second digital signals to generate a demodulated signal; a detector that detects a preamble from the first digital signal; and a control means that halts the second mixer and second A/D converter during the wait for the radio signal and that activates the second mixer and second A/D converter when the detector detects the preamble.
摘要翻译： 无线电设备包括天线; 放大器，放大经由天线接收的无线电信号; 第一混频器，其对放大的无线电信号进行频率转换以产生第一模拟信号; 第一A / D转换器，其转换第一模拟信号以产生第一数字信号; 第二混频器，其对放大的信号进行频率转换以产生第二模拟信号; 第二A / D转换器，用于转换第二模拟信号以产生第二数字信号; 解调器装置，解调第一和第二数字信号以产生解调信号; 检测器，其从所述第一数字信号检测前导码; 以及控制装置，其在等待无线电信号期间停止第二混频器和第二A / D转换器，并且当检测器检测到前导码时激活第二混频器和第二A / D转换器。
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公开(公告)号：US20060141964A1
公开(公告)日：2006-06-29
申请号：US11352371
申请日：2006-02-13
申请人： Shoji Otaka , Takafumi Yamaji
发明人： Shoji Otaka , Takafumi Yamaji
CPC分类号： H03F3/45183 , H03F2203/45246 , H03G1/0029 , H03G7/06
摘要： A variable gain amplifier device controlled by a first gain control signal comprises a gain controlled amplifier having a gain and including a differential pair of first and second MOS type transistors configured to operate in a weak inversion region; and a control signal converter configured to convert the first gain control signal into a second gain control signal, and supply the second gain control signal to the gain controlled amplifier to exponentially vary the gain with respect to the first gain control signal.
摘要翻译： 由第一增益控制信号控制的可变增益放大器装置包括增益控制放大器，该增益控制放大器具有增益并且包括配置为在弱反转区域中操作的第一和第二MOS型晶体管的差分对; 以及控制信号转换器，被配置为将所述第一增益控制信号转换为第二增益控制信号，并且将所述第二增益控制信号提供给所述增益控制放大器以相对于所述第一增益控制信号指数地改变所述增益。
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公开(公告)号：US07065334B1
公开(公告)日：2006-06-20
申请号：US11352371
申请日：2006-02-13
申请人： Shoji Otaka , Takafumi Yamaji
发明人： Shoji Otaka , Takafumi Yamaji
CPC分类号： H03F3/45183 , H03F2203/45246 , H03G1/0029 , H03G7/06
摘要： A variable gain amplifier device controlled by a first gain control signal comprises a gain controlled amplifier having a gain and including a differential pair of first and second MOS type transistors configured to operate in a weak inversion region; and a control signal converter configured to convert the first gain control signal into a second gain control signal, and supply the second gain control signal to the gain controlled amplifier to exponentially vary the gain with respect to the first gain control signal.
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公开(公告)号：US09281830B2
公开(公告)日：2016-03-08
申请号：US13421391
申请日：2012-03-15
申请人： Shoji Otaka , Takafumi Yamaji , Tsutomu Sugawara , Yasuhiko Tanabe , Masahiro Hosoya , Hiroki Sakurai
发明人： Shoji Otaka , Takafumi Yamaji , Tsutomu Sugawara , Yasuhiko Tanabe , Masahiro Hosoya , Hiroki Sakurai
CPC分类号： H03L7/18 , H03L7/0802 , H04L27/38 , H04L27/3818 , H04W52/0229 , H04W52/0274 , Y02D70/142
摘要： A radio apparatus includes a first receiver that is a processing unit for amplifying and frequency converting a radio signal received via an antenna, thereby outputting an IF signal; a detector unit for detecting a preamble signal from the IF signal; a second receiver for amplifying and quadrature demodulating the radio signal, thereby generating an I-signal and a Q-signal; a demodulator unit for demodulating the I-signal and Q-signal to generate a data signal; and a control unit for halting the operation of the first receiver and further activating the second receiver when the detector unit detects the preamble signal and for activating the first receiver and halting the operation of the second receiver when the demodulator unit completes the demodulation of the I-signal and Q-signal.
摘要翻译： 无线电设备包括：第一接收机，其是用于放大和频率转换经由天线接收的无线电信号的处理单元，从而输出IF信号; 检测单元，用于检测来自IF信号的前置信号; 第二接收机，用于放大和正交解调无线电信号，由此产生I信号和Q信号; 解调器单元，用于解调I信号和Q信号以产生数据信号; 以及控制单元，用于当所述检测器单元检测到所述前导码信号并激活所述第一接收机并停止所述第二接收机的操作时，当所述解调器单元完成所述I的解调时，停止所述第一接收机的操作并进一步激活所述第二接收机 信号和Q信号。
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公开(公告)号：US06249249B1
公开(公告)日：2001-06-19
申请号：US09310198
申请日：1999-05-12
IPC分类号： H01Q322
摘要： An active array antenna system comprises a plurality of element antennas and radio frequency circuits connected to the element antennas. The radio frequency circuits comprises first frequency converters provided to correspond to the element antenna and converts the frequency between a carrier-wave frequency and a first intermediate-frequency by using a carrier-wave frequency band local signal, second frequency converters provided to correspond to the element antenna and converts the frequency between the first intermediate-frequency signal and a second intermediate-frequency which is lower than the first intermediate frequency by using an intermediate-frequency band local signal, and a variable phase shifter circuit for individually controlling the phases of the intermediate-frequency local signals which are supplied to the second frequency converters. A variable phase shifter circuit for beam scan can be constituted at a low cost so that an active array antenna system which can be realized at a low cost is provided.
摘要翻译： 有源阵列天线系统包括连接到元件天线的多个元件天线和射频电路。 射频电路包括：第一频率转换器，其被提供用于对应于元件天线，并通过使用载波频带本地信号在载波频率和第一中频之间转换频率，第二频率转换器被提供以对应于 并且通过使用中频带本地信号来转换第一中频信号和低于第一中频的第二中频之间的频率，以及可变移相器电路，用于单独控制 提供给第二变频器的中频局部信号。 可以以低成本构成用于光束扫描的可变移相器电路，从而提供可以以低成本实现的有源阵列天线系统。
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公开(公告)号：US06714604B1
公开(公告)日：2004-03-30
申请号：US09604838
申请日：2000-06-27
IPC分类号： H04B126
CPC分类号： H04B1/0014 , H04B1/0007 , H04B1/0039 , H04B1/28
摘要： An orthogonal demodulating section converts the frequency of received signals to the lower range in batch after rejecting an image band thereof by an RF filter. An image rejecting section rejects the image band of the orthogonally converted output. It allows an enough image rejecting degree to be obtained. An A/D converter section converts the whole range into a digital signal and an orthogonal demodulating section demodulates a desirable channel by means of digital processing. Then, a channel selecting section selects and outputs the desirable channel. It then allows wide-bands to be received in batch, flexible processing to be achieved by the digital processing and an enough image rejecting degree to be obtained.
摘要翻译： 正交解调部在通过RF滤波器拒绝其图像频带之后，将接收信号的频率分批转换为较低范围。 图像拒绝部分拒绝正交转换输出的图像带。 它允许获得足够的图像拒绝度。 A / D转换器部分将整个范围转换为数字信号，并且正交解调部分通过数字处理解调期望的信道。 然后，频道选择部分选择并输出所需频道。 然后允许批量接收宽带，通过数字处理实现灵活处理，并获得足够的图像拒绝度。
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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
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。
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