公开(公告)号：US06346804B2

公开(公告)日：2002-02-12

申请号：US09885979

申请日：2001-06-22

申请人： Takashi Ueno ,  Tetsuro Itakura ,  Hiroshi Tanimoto

发明人： Takashi Ueno ,  Tetsuro Itakura ,  Hiroshi Tanimoto

IPC分类号： G05F316

CPC分类号： G05F3/265 ,  G05F3/262

摘要： There is disclosed an impedance conversion circuit called a regulated cascode circuit in which a parasitic capacity deteriorating frequency characteristics is reduced during operation up to about several hundreds of megahertz or higher frequencies. In the impedance conversion circuit comprising two regulated cascode circuits in which active elements and reverse amplifiers are interconnected with a feedback applied thereto, a capacity element is disposed between a control end of one active element and an output end of the other active element.

摘要翻译： 公开了一种称为调制共源共栅电路的阻抗转换电路，其中在操作期间降低频率特性的寄生电容降低到几百兆赫兹或更高的频率。 在包括两个调节共源共栅电路的阻抗转换电路中，其中有源元件和反向放大器与施加到其上的反馈互连，电容元件设置在一个有源元件的控制端和另一个有源元件的输出端之间。

公开(公告)号：US06498929B1

公开(公告)日：2002-12-24

申请号：US08880679

申请日：1997-06-23

申请人： Hiroshi Tsurumi ,  Hiroshi Yoshida ,  Tetsuro Itakura ,  Takafumi Yamaji ,  Akira Yasuda ,  Takashi Ueno ,  Hiroshi Tanimoto ,  Ryuichi Fujimoto ,  Hiroshi Horiguchi

发明人： Hiroshi Tsurumi ,  Hiroshi Yoshida ,  Tetsuro Itakura ,  Takafumi Yamaji ,  Akira Yasuda ,  Takashi Ueno ,  Hiroshi Tanimoto ,  Ryuichi Fujimoto ,  Hiroshi Horiguchi

IPC分类号： H04B716

CPC分类号： H03D3/008 ,  H03G3/3052 ,  H04B1/30

摘要： A receiver having a function of a direct current offset, and including a receiving section for receiving a radio frequency signal, an analog signal processing section for amplifying, band-converting and frequency-converting an analog signal inputted from the receiving section, and an AD converting section for converting an output of the analog signal processing section from an analog signal to a digital signal. Also included is a digital signal processing section for processing the digital signal converted by the DC converting section. The receiver further includes an offset detecting element, provided in the digital signal processing section, for detecting a direct current offset signal produced in the receiving section or a frequency converting section, an offset holding element, provided in the digital signal processing section, for holding the direct current offset signal detected by the offset detecting element, a DA converting section for converting the direct current offset signal detected by the digital signal processing section into an analog signal, and a first offset correcting element, provided in the analog signal processing section, for correcting the analog signal on the basis of the direct current offset signal converted by the DA converting section into the analog signal.

摘要翻译： 具有直流偏移功能的接收机，包括用于接收射频信号的接收部分，用于放大从接收部分输入的模拟信号的频带转换和频率转换的模拟信号处理部分，以及AD 转换部分，用于将模拟信号处理部分的输出从模拟信号转换成数字信号。 还包括用于处理由DC转换部分转换的数字信号的数字信号处理部分。 接收机还包括偏移检测元件，设置在数字信号处理部分中，用于检测在数字信号处理部分中设置的接收部分或频率转换部分产生的直流偏移信号，偏移保持元件，用于保持 由偏移检测元件检测的直流偏移信号，用于将由数字信号处理部分检测的直流偏移信号转换为模拟信号的DA转换部分和设置在模拟信号处理部分中的第一偏移校正元件， 用于基于由DA转换部分转换成的模拟信号的直流偏移信号来校正模拟信号。

公开(公告)号：US5890058A

公开(公告)日：1999-03-30

申请号：US715345

申请日：1996-09-18

申请人： Takashi Ueno ,  Tetsuro Itakura ,  Hiroshi Tanimoto

发明人： Takashi Ueno ,  Tetsuro Itakura ,  Hiroshi Tanimoto

IPC分类号： H03H11/04 ,  H04B1/40

CPC分类号： H03H11/04

摘要： In an FDNR type active filter fabricated on an integrated circuit, an FDNR circuit is provided wherein one ends of a first capacitor and an impedance element are connected to an inverted input of an operational amplifier, one ends of the impedance element and a second capacitor are connected to an output end of the operational amplifier, and the other ends of the first and second capacitors are connected to each other. To the impedance element, resistors are connected in series. To the connecting end of the resistors, one end of another resistor is connected, the other end thereof being grounded in an alternating current form. The capacity value of the second capacitor is greater than that of the first capacitor.

摘要翻译： 在集成电路上制造的FDNR型有源滤波器中，提供FDNR电路，其中第一电容器和阻抗元件的一端连接到运算放大器的反相输入，阻抗元件的一端和第二电容器 连接到运算放大器的输出端，并且第一和第二电容器的另一端彼此连接。 阻抗元件串联连接电阻。 电阻器的连接端连接另一个电阻的一端，另一端以交流形式接地。 第二电容器的容量值大于第一电容器的容量值。

公开(公告)号：US06381449B1

公开(公告)日：2002-04-30

申请号：US09337525

申请日：1999-06-22

申请人： Takafumi Yamaji ,  Tetsuro Itakura ,  Hiroshi Tanimoto

发明人： Takafumi Yamaji ,  Tetsuro Itakura ,  Hiroshi Tanimoto

IPC分类号： H04B126

CPC分类号： H03D7/1433 ,  H03D7/1425 ,  H03D2200/0084 ,  H03D2200/0088

摘要： A frequency converter including a mixer circuit which inputs a local oscillation signal and a radio-frequency input signal modulated for communication of information, and performs frequency conversion. A buffer amplifier is higher than a desired signal frequency band, and has a low-pass passage characteristic of cut-off frequency lower than an adjacent channel carrier frequency.

摘要翻译： 一种变频器，包括输入本地振荡信号的混频电路和用于信息通信调制的射频输入信号，并进行频率转换。 缓冲放大器高于期望的信号频带，并且具有低于相邻信道载波频率的截止频率的低通通道特性。

公开(公告)号：US5990737A

公开(公告)日：1999-11-23

申请号：US66933

申请日：1998-04-28

申请人： Zdzislaw Czarnul ,  Hiroshi Tanimoto ,  Tetsuro Itakura

发明人： Zdzislaw Czarnul ,  Hiroshi Tanimoto ,  Tetsuro Itakura

IPC分类号： H03F3/45

CPC分类号： H03F3/45183 ,  H03F3/45475 ,  H03F3/45645 ,  H03F3/45659 ,  H03F3/45941 ,  H03F2203/45138

摘要： A balanced amplifier includes first and second multi-input single-ended output differential amplifiers having matched characteristics and a feedback circuit. The feedback circuit connects differential input terminals and output terminals of the first and second multi-input single-ended output differential amplifiers so that all of the differential input terminals of the first and second multi-input single-ended output differential amplifiers are virtually shorted.

摘要翻译： 平衡放大器包括具有匹配特性的第一和第二多输入单端输出差分放大器以及反馈电路。 反馈电路连接第一和第二多输入单端输出差分放大器的差分输入端和输出端，使得第一和第二多输入单端输出差分放大器的所有差分输入端实际上短路。

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

IPC分类号： H03D7/00 ,  H03D7/14 ,  H04B1/00

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。

公开(公告)号：US5471171A

公开(公告)日：1995-11-28

申请号：US45537

申请日：1993-04-09

申请人： Tetsuro Itakura ,  Hiroshi Tanimoto

发明人： Tetsuro Itakura ,  Hiroshi Tanimoto

IPC分类号： H03F1/02 ,  H03F3/45

CPC分类号： H03F3/3022 ,  H03F1/0244 ,  H03F1/0261 ,  H03F3/301 ,  H03F2203/30048 ,  H03F2203/30121 ,  H03F2203/45008 ,  H03F2203/45014 ,  H03F2203/45466

摘要： An amplifier device capable of performing an efficient amplifying operation with a low power consumption includes an amplifier circuit at least having an input amplifier stage which amplifies a level change of an input signal to output an amplified current, and an output stage which outputs the amplified current as a driving output to a capacitive load; a primary bias circuit for ordinarily supplying a constant and main bias current to the amplifier circuit; a determination element for determining a change condition of the level change of the input signal, which is supplied from the input amplifier stage, so as to generate a control signal corresponding to said change condition; and a driving capability increase element as a secondary bias circuit for increasing a bias current in order to increase the driving output supplied to the capacitive load when the control signal is input.

摘要翻译： 能够以低功耗进行高效放大运算的放大器装置，具有至少具有放大输入信号的电平变化以输出放大电流的输入放大级的放大电路，以及输出放大电流的输出级 作为电容性负载的驱动输出; 用于通常向放大器电路提供恒定和主偏置电流的初级偏置电路; 确定元件，用于确定从输入放大器级提供的输入信号的电平变化的变化状态，以产生对应于所述变化条件的控制信号; 以及作为用于增加偏置电流的次级偏置电路的驱动能力增加元件，以便当输入控制信号时增加提供给电容性负载的驱动输出。

公开(公告)号：US5399992A

公开(公告)日：1995-03-21

申请号：US152887

申请日：1993-11-16

申请人： Tetsuro Itakura ,  Hiroshi Tanimoto

发明人： Tetsuro Itakura ,  Hiroshi Tanimoto

IPC分类号： H03F3/45 ,  H03F1/02 ,  H03K17/04 ,  H03K17/687 ,  H03K19/0175 ,  H03K19/094

CPC分类号： H03F1/0244 ,  H03F1/0261 ,  H03F3/301 ,  H03F3/3022 ,  H03F2203/30048 ,  H03F2203/30121 ,  H03F2203/45008 ,  H03F2203/45014 ,  H03F2203/45466

摘要： An amplifier device includes: a current amplifier element for amplifying an output current delivered to a capacitive load, such as, for example, a liquid crystal panel in dependency upon changes of the voltage of an input signal; an element for determining the state of changes in the input signal; and a control element for controlling the current amplifier element depending upon the state of changes in the input signal determined by the determination element in order to improve the output driving capability for the load. This amplifier device is applicable to an amplifier in a narrow sense and a buffer circuit in accordance with the mode of amplification. The former may include the configuration in which a second bias circuit for adding a bias current when the driving capability is required to be enhanced is provided in addition to an elementary bias circuit, and the configuration in which a first output drive element and the second output drive element and a plurality of output drive elements succeeding thereto are provided for additionally carrying out switching between incremental output currents. The latter may be classified into two types depending upon whether or not the potential difference element provided on the output side of the buffer circuit to detect a potential difference between the input and the output to add the output current when the the potential difference thus detected is above the threshold level.

摘要翻译： 放大器装置包括：电流放大器元件，用于根据输入信号的电压变化放大输出到电容性负载的输出电流，例如液晶面板; 用于确定输入信号的变化状态的元件; 以及控制元件，用于根据由确定元件确定的输入信号的变化状态来控制电流放大器元件，以便提高负载的输出驱动能力。 该放大器装置适用于狭义上的放大器和根据放大模式的缓冲电路。 前者可以包括除了基本偏置电路之外还提供了在需要增强驱动能力时用于增加偏置电流的第二偏置电路的配置，以及其中第一输出驱动元件和第二输出 驱动元件和其后的多个输出驱动元件被设置用于附加地执行增量输出电流之间的切换。 后者可以分为两种类型，这取决于当这样检测的电位差时，缓冲电路的输出侧的电位差元件是否检测输入和输出之间的电位差以增加输出电流 高于阈值水平。

公开(公告)号：US06577188B2

公开(公告)日：2003-06-10

申请号：US10200405

申请日：2002-07-23

申请人： Takashi Ueno ,  Tadashi Arai ,  Takafumi Yamaji ,  Hiroshi Yoshida ,  Tetsuro Itakura

发明人： Takashi Ueno ,  Tadashi Arai ,  Takafumi Yamaji ,  Hiroshi Yoshida ,  Tetsuro Itakura

IPC分类号： H03F136

CPC分类号： H03G3/3036 ,  H03F3/45973 ,  H03G3/3005

摘要： A variable gain amplifier comprises a main amplifier circuit whose gain is controllable and which amplifies a difference signal between an input signal and a feedback signal, a feedback amplifier circuit whose gain is controllable and which amplifies an output signal of the main amplifier circuit, and a gain control circuit which complementarily control the gain of the main amplifier circuit and the gain of the feedback amplifier circuit.

公开(公告)号：US06690232B2

公开(公告)日：2004-02-10

申请号：US10210057

申请日：2002-08-02

申请人： Takashi Ueno ,  Tadashi Arai ,  Tetsuro Itakura

发明人： Takashi Ueno ,  Tadashi Arai ,  Tetsuro Itakura

IPC分类号： H03F136

CPC分类号： H03G9/16

摘要： A variable gain amplifier device comprises a variable gain amplifier circuit which amplifies a difference between an input signal and a feedback signal to output an output signal, a feedback circuit which supplies the feedback signal to the variable gain amplifier circuit, and a controller which controls the variable gain amplifier circuit and the feedback circuit to decrease a cutoff frequency of the feedback circuit according to increase of a gain of the variable gain amplifier circuit or vice versa.