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1. 发明授权

US5525924A Log conversion circuit 失效
标题翻译：日志转换电路
公开(公告)号：US5525924A
公开(公告)日：1996-06-11
申请号：US306367
申请日：1994-09-15
申请人： Takashi Ueno , Mikio Koyama , Hiroshi Tanimoto
发明人： Takashi Ueno , Mikio Koyama , Hiroshi Tanimoto
IPC分类号： G06G7/24 , H03G7/08 , H03G11/08
CPC分类号： H03G7/08
摘要： A log conversion circuit comprising first and second input terminals to which voltage signals are input, first and second resistors, first ends of which are respectively connected to the first and second input terminals, first and second PN junction element sections connected in series and in opposite polarities, between a second end of the first resistor and a second end of the second resistor, a biasing circuit connected between a first source terminal and a node between the first and second PN junction element sections, first and second current sources for determining potentials at both ends of the first resistor, the first current source means connected between the first end of the first resistor and the first and second source terminals, and the second current source means being connected between the second end of the first resistor and the first and second source terminals, third and fourth current sources for determining potentials at both ends of the second resistor, the third current source means connected between the first end of the second resistor and the first and second source terminals, and the fourth current source means being connected between the second end of the second resistor and the first and second source terminals, and first and second output terminals for outputting voltage signals generated in the first and second PN junction element sections.
摘要翻译：一种对数转换电路，包括输入电压信号的第一和第二输入端子，第一和第二电阻器，第一和第二电阻器的第一端分别连接到第一和第二输入端子，第一和第二PN结元件部分串联连接，在所述第一电阻器的第二端和所述第二电阻器的第二端之间的极性，连接在所述第一和第二PN结元件部分之间的第一源极端子和节点之间的偏置电路，用于确定第一和第二PN结元件部分之间的电位的第一和第二电流源第一电阻器的两端连接在第一电阻器的第一端和第一和第二源极之间，第二电流源装置连接在第一电阻器的第二端和第一和第二电阻之间源极端子，用于确定第二电阻器两端电位的第三和第四电流源，第三电流源电流源装置连接在第二电阻器的第一端和第一和第二源极之间，第四电流源装置连接在第二电阻器的第二端和第一和第二源极端子之间，第一和第二输出端子用于输出在第一和第二PN结元件部分中产生的电压信号。

2. 发明授权

US5227681A Integration circuit 失效
标题翻译：集成电路
公开(公告)号：US5227681A
公开(公告)日：1993-07-13
申请号：US715772
申请日：1991-06-14
申请人： Mikio Koyama , Hiroshi Tanimoto
发明人： Mikio Koyama , Hiroshi Tanimoto
IPC分类号： G06G7/184 , H03H11/04
CPC分类号： G06G7/184 , H03H11/0433 , H03H11/045
摘要： An integration circuit includes a differential amplifier constituted by at least two bipolar transistors serving as amplifying elements, a capacitor connected, as a load, to the differential amplifier, and a field-effect transistor having source and drain electrodes connected between the emitter electrodes of the two bipolar transistors. A control voltage is applied to the gate electrode of the field-effect transistor.

3. 再颁专利

USRE36861E Linear differential amplifier 有权
标题翻译：线性差分放大器
公开(公告)号：USRE36861E
公开(公告)日：2000-09-12
申请号：US264034
申请日：1999-03-08
申请人： Mikio Koyama , Hiroshi Tanimoto
发明人： Mikio Koyama , Hiroshi Tanimoto
IPC分类号： H03F3/45
摘要： A differential amplifier with improved linearity. The amplifier includes a circuit comprised of two emitter-coupled pairs, each pair being formed by two transistors, with connections between corresponding collectors, and constant voltage sources for producing offsets between corresponding bases of the emitter-coupled pairs. The improved linearity is achieved by obtaining outputs as sums of collector currents with offsets. The emitter areas of the transmitters can be of the minimum size available. This feature, when combined with the use of emitter-followers as the constant voltage sources, enable the differential amplifier to achieve a high S/N ratio, a good high-frequency characteristic, a high direct current gain, and a high-speed operation capability along with the improved linearity. In addition, the linearity is further improved by using additional diodes connected to the transistors.
摘要翻译：具有提高线性度的差分放大器。放大器包括由两个发射极耦合对组成的电路，每对由两个晶体管形成，其中相应的集电极之间具有连接，以及用于产生发射极耦合对的相应基极之间的偏移的恒定电压源。通过获得输出作为具有偏移的集电极电流的总和来实现改进的线性度。变送器的发射极面积可以是可用的最小尺寸。该特征与使用发射极跟随器作为恒定电压源组合使能使差分放大器实现高S / N比，良好的高频特性，高直流增益和高速运算能力以及改善的线性度。此外，通过使用连接到晶体管的附加二极管来进一步提高线性度。

4. 发明授权

US4884036A Band-pass filter 失效
标题翻译：带通滤波器
公开(公告)号：US4884036A
公开(公告)日：1989-11-28
申请号：US163843
申请日：1988-03-03
申请人： Mikio Koyama , Hiroshi Tanimoto
发明人： Mikio Koyama , Hiroshi Tanimoto
IPC分类号： H03H11/04
CPC分类号： H03H11/04
摘要： A loop circuit of a band-pass filter is constituted by connecting two integrating circuits each including a current source and a capacitor connected to an output terminal of the current source so that an input terminal of one of the integrating circuits is connected to an output terminal of the other and an output terminal of one of the integrating circuits is connected to an input terminal of the other. At least two sets of the loop circuits are used, and these loop circuits are coupled by a capacitor (Ck). Two termination resistors are connected to an output terminal of a start loop circuit and an output terminal of an end loop circuit, respectively. A coupling capacitor is connected to an input terminal of the start loop circuit, and an input signal is input to the start loop circuit through the coupling capacitor. An output signal is output from an output terminal of the end loop circuit.

5. 发明授权

US5384501A Integration circuit including a differential amplifier having a variable transconductance 失效
标题翻译：积分电路包括具有可变跨导的差分放大器
公开(公告)号：US5384501A
公开(公告)日：1995-01-24
申请号：US56392
申请日：1993-05-04
申请人： Mikio Koyama , Hiroshi Tanimoto
发明人： Mikio Koyama , Hiroshi Tanimoto
IPC分类号： G06G7/184 , H03H11/04 , H03F3/45
CPC分类号： G06G7/184 , H03H11/0433 , H03H11/045 , H03H11/0472
摘要： An integration circuit includes a differential amplifier constituted by at least two bipolar transistors serving as amplifying elements, a capacitor connected, as a load, across the collection electrodes of the differential amplifier, and a field-effect transistor having source and drain electrodes connected between the emitter electrodes of the two bipolar transistors. A control voltage is applied to the gate electrode of the field-effect transistor. By changing the resistance value between the source and drain electrodes of the field-effect transistor using a gate voltage, the transconductance of the differential amplifier is changed over a wide range. As a result, the time constant of the integration circuit is changed, such that if the integration circuit is used for an active filter, for example, the cut-off frequency can be changed by changing the time constant of the integration circuit.
摘要翻译：积分电路包括由用作放大元件的至少两个双极晶体管构成的差分放大器，作为负载连接在差分放大器的集电极上的电容器，以及具有连接在差分放大器的集电极之间的源极和漏极的场效应晶体管两个双极晶体管的发射极。控制电压施加到场效应晶体管的栅电极。通过使用栅极电压来改变场效应晶体管的源电极和漏电极之间的电阻值，差分放大器的跨导在宽范围内变化。结果，积分电路的时间常数被改变，使得如果积分电路用于有源滤波器，例如，可以通过改变积分电路的时间常数来改变截止频率。

6. 发明授权

US5081423A Integrator and active filter including integrator with simple phase compensation 失效
标题翻译：集成器和主动滤波器，包括具有简单相位补偿的积分器
公开(公告)号：US5081423A
公开(公告)日：1992-01-14
申请号：US385305
申请日：1989-07-26
申请人： Mikio Koyama , Hiroshi Tanimoto
发明人： Mikio Koyama , Hiroshi Tanimoto
IPC分类号： G06G7/186 , H03F1/32 , H03F3/45 , H03H11/12
CPC分类号： H03F3/4521 , G06G7/186 , H03F1/3211 , H03F3/45071 , H03H11/1213 , H03F2203/45366
摘要： In an integrator circuit having a wide linearity range, there are provided: a first emitter-coupled transistor pair having two bipolar transistors, emitter areas of the transistors being substantially equal to each other; a second emitter-coupled transistor pair having two bipolar transistors, emitter areas of said transistors being substantially equal to each other; first and second input terminals for receiving an input voltage respectively; a first output terminal to which a first collector of the first emitter-coupled pair and also a first collector of the second emitter-coupled transistor pair of commonly connected; a second output terminal to which a second collector of the first emitter-coupled transistor pair and also a second collector of the second emitter-coupled transistor pair are commonly connected; first DC-voltage applying means connected to the first input terminal, for applying a first offset DC (direct current) voltage having a predetermined level between a first base electrode of the first emitter-coupled transistor pair and a first base electrode of the second emitter-coupled transistor pair; second DC-voltage applying means connected to the second input terminal, for applying a second offset DC voltage having the same level but an opposite polarity to that of the first offset DC voltage between a second base electrode of the first emitter-coupled transistor pair and a second base electrode of the second emitter-coupled transistor pair; and, capacitance means connected between the first and second output terminals.

7. 发明授权

US5006818A Linear differential amplifier 失效
标题翻译：线性差分放大器
公开(公告)号：US5006818A
公开(公告)日：1991-04-09
申请号：US500044
申请日：1990-03-27
申请人： Mikio Koyama , Hiroshi Tanimoto
发明人： Mikio Koyama , Hiroshi Tanimoto
IPC分类号： H03F3/45 , H03F1/32
CPC分类号： H03F1/3211
摘要： A differential amplifier with improved linearity. The amplifier includes a circuit comprised of two emitter-coupled pairs, each pair being formed by two transistors, with connections between corresponding collectors, and constant voltage sources for producing offsets between corresponding bases of the emitter-coupled pairs. The improved linearity is achieved by obtaining outputs as sums of collector currents with offsets. The emitter areas of the transistors can be of the minimum size available. This feature, when combined with the use of emitter-followers as the constant voltage sources, enable the differential amplifier to achieve a high S/N ratio, a good high-frequency characteristic, a high direct current gain, and a high-speed operation capability along with the improved linearity. In addition, the linearity is further improved by using additional diodes connected to the transistors.

8. 发明授权

US5890058A Electronic circuit and filter device using same 失效
标题翻译：电子电路和过滤器使用相同
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。

9. 发明授权

US06498929B1 Receiver having DC offset decreasing function and communication system using the same 失效
标题翻译：具有DC偏移减小功能的接收机和使用该功能的通信系统
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。

10. 发明授权

US06346804B2 Impedance conversion circuit 失效
标题翻译：阻抗转换电路
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。

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