公开(公告)号：US5227795A

公开(公告)日：1993-07-13

申请号：US704599

申请日：1991-05-23

申请人： Kazuo Yamakido ,  Norimitsu Nishikawa ,  Katsuhiro Furukawa ,  Yuko Tamba ,  Takao Okazaki

发明人： Kazuo Yamakido ,  Norimitsu Nishikawa ,  Katsuhiro Furukawa ,  Yuko Tamba ,  Takao Okazaki

IPC分类号： H03M3/04 ,  H03M3/02

CPC分类号： H03M3/434 ,  H03M3/456

摘要： An over-sampling analog-to-digital converter using a current switching circuit 102 as a local digital-to-analog converter, wherein a difference between the output currents Isig and Iq of a voltage-to-current converter circuit 101 and a current switching circuit is integrated by a capacitor 105 of which the one end is grounded to a dc potential VB. Further, the current switching circuit 102 has many bits to decrease the difference current between the signal current Isig and the feedback current signal Iq. Moreover, the level-shifting function of the voltage-to-current converter circuit 101 makes it possible to apparently subtract the dc component from the input analog signal Vsig which is produced based on an internally generated dc voltage as a dc bias voltage, and to decrease a change in the voltage between the electrodes of a capacitor caused by the integration of current.

摘要翻译： 使用电流开关电路102作为本地数模转换器的过采样模数转换器，其中电压 - 电流转换器电路101的输出电流Isig和Iq之间的差异以及电流切换 电路通过其一端接地到直流电位VB的电容器105来集成。 此外，电流开关电路102具有许多位以减小信号电流Isig和反馈电流信号Iq之间的差电流。 此外，电压 - 电流转换器电路101的电平转换功能使得可以从基于内部产生的直流电压产生的输入模拟信号Vsig显然地减去直流分量作为直流偏置电压，并且 降低由电流的积分引起的电容器电极之间的电压变化。

公开(公告)号：US5515047A

公开(公告)日：1996-05-07

申请号：US170411

申请日：1993-12-20

申请人： Kazuo Yamakido ,  Yoichiro Kobayashi ,  Masanori Otsuka ,  Takao Okazaki ,  Yukihito Ishihara ,  Norimitsu Nishikawa ,  Yuko Tamba

发明人： Kazuo Yamakido ,  Yoichiro Kobayashi ,  Masanori Otsuka ,  Takao Okazaki ,  Yukihito Ishihara ,  Norimitsu Nishikawa ,  Yuko Tamba

IPC分类号： H03M1/10 ,  H03M1/68 ,  H03M1/74 ,  H04B1/40 ,  H03M1/06

CPC分类号： H03M1/687 ,  H03M1/1019 ,  H03M1/745 ,  H03M1/747

摘要： The number of current sources and switches necessary for a plurality of unit D/A converters using equal reference currents, are drastically reduced to reduce the parasitic capacitance coupled to current output lines, by converting a plurality of digital signals of a predetermined bit, which are divided from an input digital signal, into an analog current unit D/A converters and by converting the analog current in a manner to correspond to the weights of the corresponding input digital signals, thereby to synthesize the currents. The fixed reference digital signal is inputted to the D/A converter for cancelling offsets. The offsets of a plurality of analog output signals in positive and opposite phases obtained by branching the output of the D/A converter are individually detected. After this, the DC offset values of the individual analog outputs are used as offset adjusted negative feedback signals for a desired value. One of them is the digital signal to be fed back to the input portion of the D/A converter whereas the other is the analog signal to be fed to a path portion obtained by branching the output of the D/A converter.

摘要翻译： 使用相同参考电流的多个单元D / A转换器所需的电流源和开关的数量被大大减少，通过转换预定位的多个数字信号来减小耦合到电流输出线的寄生电容， 从输入数字信号中分离成模拟电流单元D / A转换器，并通过转换模拟电流以对应于相应的输入数字信号的权重，从而合成电流。 固定参考数字信号被输入到D / A转换器以取消偏移。 分别检测通过分支D / A转换器的输出而获得的正相位和相位相位中的多个模拟输出信号的偏移。 之后，各个模拟输出的DC偏移值用作所需值的偏移调整负反馈信号。 其中一个是要反馈到D / A转换器的输入部分的数字信号，而另一个是要馈送到通过分支D / A转换器的输出而获得的路径部分的模拟信号。

公开(公告)号：US6130577A

公开(公告)日：2000-10-10

申请号：US973899

申请日：1998-04-02

申请人： Yuko Tamba ,  Taiji Kondou ,  Katsuhiro Furukawa ,  Yukihito Ishihara

发明人： Yuko Tamba ,  Taiji Kondou ,  Katsuhiro Furukawa ,  Yukihito Ishihara

IPC分类号： H03L7/18 ,  H04L7/02 ,  H04L7/033 ,  H04L27/233 ,  H04L27/38 ,  H04L27/22

CPC分类号： H04L7/0066 ,  H04L27/2332 ,  H04L27/3881 ,  H04L27/389 ,  H04L7/0331 ,  H04L7/0337 ,  H03L7/18

摘要： In a digital demodulator for phase modulated signals, logical values of a waveform-shaped phase-modulated signal are sampled based on a clock signal having a period that stands in integer ratio relationship to a carrier period of the modulated signal and thereafter subjected to serial/parallel conversion for each predetermined interval, whereby a logical pattern of a digital code train subjected to the serial/parallel conversion is analyzed. As a result, phase information required to demodulate digital data can be logically detected.

摘要翻译： PCT No.PCT / JP96 / 01573 Sec。 371日期：1998年4月2日 102（e）1998年4月2日PCT PCT 1996年6月11日PCT公布。 出版物WO97 / 01908 日期1997年1月16日在相位调制信号的数字解调器中，基于具有与调制信号的载波周期成整数比的周期的时钟信号对波形相位调制信号的逻辑值进行采样， 然后对每个预定间隔进行串行/并行转换，由此分析经受串行/并行转换的数字代码串的逻辑模式。 结果，可以逻辑地检测解调数字数据所需的相位信息。

公开(公告)号：US5347279A

公开(公告)日：1994-09-13

申请号：US939594

申请日：1992-09-02

申请人： Yukihito Ishihara ,  Kazuo Yamakido ,  Yuko Tamba

发明人： Yukihito Ishihara ,  Kazuo Yamakido ,  Yuko Tamba

IPC分类号： H03M3/02 ,  H03M1/50

CPC分类号： H03M3/356 ,  H03M3/458

摘要： The difference between the output current of a voltage-current converter circuit and the output current of a local D/A converter circuit 2, whose output current is controlled by a feedback signal, is integrated by an analog circuit of which one end is connected to a DC potential point, and the voltage obtained by the integration thereof is quantized by a quantizing circuit. The result is integrated by a digital integrating circuit and is fed to a feedback correcting circuit 6 and, further, the result of A/D conversion is output. The feedback correcting circuit outputs a temporary feedback signal while the digital integration is being operated based on the output of the quantizing circuit. After the digital integrating operation completes the digital integration operation, a corrected feedback signal is generated instead of the temporary feedback signal. The signals inputted into the analog circuit 3 are continuously sampled even while the digital integration operation is being carried out.

摘要翻译： 电压电流转换器电路的输出电流与其输出电流由反馈信号控制的本地D / A转换器电路2的输出电流之间的差异由其一端连接到的模拟电路 DC电位点，并且通过其积分获得的电压由量化电路量化。 结果由数字积分电路集成，并被馈送到反馈校正电路6，并且进一步输出A / D转换的结果。 反馈校正电路在基于量化电路的输出操作数字积分的同时输出临时反馈信号。 在数字积分运算完成数字积分运算之后，产生经校正的反馈信号而不是临时反馈信号。 即使在进行数字积分操作时，输入到模拟电路3的信号也被连续取样。

公开(公告)号：US5679971A

公开(公告)日：1997-10-21

申请号：US505459

申请日：1995-07-21

申请人： Yuko Tamba ,  Akihiro Nagatani ,  Takao Okazaki

发明人： Yuko Tamba ,  Akihiro Nagatani ,  Takao Okazaki

IPC分类号： H01L27/04 ,  H01L21/822 ,  H01L21/8234 ,  H01L27/02 ,  H01L27/088 ,  H01L29/06 ,  H01L29/78

CPC分类号： H01L27/0251 ,  H01L27/0255 ,  H01L27/0266 ,  H01L2924/0002

摘要： In a semiconductor integrated circuit having a plurality of electronic circuits each provided with interfaces used for effecting signal transmission, and supplied with operating voltages from a plurality of independent power supply terminals, protective elements each having high threshold voltages at which the elements are off in the ordinary state of power supply are provided, and a resistor and a diode both for preventing electrostatic breakdown are connected to the gate of an input MOSFET of the interface for carrying out signal transmission between the electronic circuits. Even when a high voltage due to static electricity is applied to each power supply terminal while the semiconductor integrated circuit is handled, electrostatic breakdown of the interface can be prevented by the protective element or the electrostatic breakdown preventive circuit comprising a resistor and a diode.

摘要翻译： 在具有多个电子电路的半导体集成电路中，每个电子电路设置有用于进行信号传输的接口，并且提供来自多个独立电源端子的工作电压，每个具有高阈值电压的保护元件， 提供通常的电源状态，并且用于防止静电击穿的电阻器和二极管连接到用于在电子电路之间执行信号传输的接口的输入MOSFET的栅极。 即使当处理半导体集成电路时由静电导致的高电压施加到每个电源端子时，也可以通过包括电阻器和二极管的保护元件或防静电电路来防止界面的静电破坏。

公开(公告)号：US5594383A

公开(公告)日：1997-01-14

申请号：US370660

申请日：1995-01-10

申请人： Yuko Tamba

发明人： Yuko Tamba

IPC分类号： H03H11/04 ,  H03F3/45 ,  H03B1/00 ,  H03K5/00

CPC分类号： H03F3/45076 ,  H03H11/04 ,  H03F2203/45318 ,  H03F2203/45328 ,  H03F2203/45364 ,  H03F2203/45466 ,  H03F2203/45571 ,  H03F2203/45612 ,  H03F2203/45641 ,  H03F2203/45648

摘要： A Gm-controllable amplifier is used in an OTA-C filter. Specifically, the amplifier is one in which a constant voltage from a bias circuit is applied to the gates of load MOSFETs connected to the drains of input differential MOSFETs of a differential amplifier to allow the load MOSFETs to operate as constant current sources and the inverted output terminals of the circuit are connected to the input terminals. The load MOSFETs of the input differential MOSFETs are made to operate as the constant current sources, so that the drain voltages of the input differential MOSFETs become independent of the threshold voltage of the load MOSFETs. Even if the supply voltage is set to as low as about 1.5 V, the input differential MOSFETs can be prevented from being unsaturated when the input signals rise. Since the inverted output terminals are coupled to the input terminals, the currents outputted from the inverted output terminals in the opposite direction of the current coming from the non-inverted output terminals can be absorbed from the non-inverting input terminals, so that the balance of the circuit can be easily maintained.

摘要翻译： 在OTA-C滤波器中使用Gm可控放大器。 具体来说，放大器是将来自偏置电路的恒定电压施加到连接到差分放大器的输入差分MOSFET的漏极的负载MOSFET的栅极，以允许负载MOSFET作为恒定电流源和反相输出 电路的端子连接到输入端子。 使输入差分MOSFET的负载MOSFET作为恒流源工作，使得输入差分MOSFET的漏极电压与负载MOSFET的阈值电压无关。 即使电源电压设置为低至约1.5 V，输入信号上升时也可以防止输入差分MOSFET不饱和。 由于反相输出端子耦合到输入端子，所以从反相输出端子的电流相反方向输出的反相输出端子的电流可以从非反相输入端子吸收，从而平衡 的电路可以很容易地维护。