公开(公告)号：US06703957B2

公开(公告)日：2004-03-09

申请号：US10143878

申请日：2002-05-14

申请人： Yasuo Morimoto ,  Toshio Kumamoto ,  Takashi Okuda ,  Takahiro Miki

发明人： Yasuo Morimoto ,  Toshio Kumamoto ,  Takashi Okuda ,  Takahiro Miki

IPC分类号： H03M166

CPC分类号： H03M1/0614 ,  H03K5/01 ,  H03K5/133 ,  H03M1/822 ,  H03M3/372 ,  H03M3/506

摘要： When forming PDM pulses by a D/A converter in accordance with digital signals, the D/A converter causes at least one of the rising stage and the falling stage of each of the PDM pulses to change stepwise. In addition, when forming PWM pulses by another D/A converter, the D/A converter causes at least one of the rising stage and the falling stage of each of the PWM pulses to change stepwise.

摘要翻译： 当通过D / A转换器根据数字信号形成PDM脉冲时，D / A转换器使得每个PDM脉冲的上升沿和下降沿中的至少一个逐步改变。 此外，当由另一个D / A转换器形成PWM脉冲时，D / A转换器使每个PWM脉冲的上升沿和下降沿中的至少一个逐步改变。

公开(公告)号：US5995031A

公开(公告)日：1999-11-30

申请号：US968207

申请日：1997-11-12

申请人： Takashi Okuda ,  Toshio Kumamoto ,  Masao Ito ,  Takahiro Miki

发明人： Takashi Okuda ,  Toshio Kumamoto ,  Masao Ito ,  Takahiro Miki

IPC分类号： H03M1/10 ,  H03M1/06 ,  H03M1/74 ,  H03M1/66

CPC分类号： H03M1/0663 ,  H03M1/747 ,  H03M3/464 ,  H03M3/502

摘要： A multi-bit D/A converter which improves the linearity of an analog output relative to a digital input is provided. A switch control circuit (1) turns on D some of a plurality of switches (S1 to SM) which are arranged in ascending order starting with a switch determined by a start position determination circuit (3) and turns off the remaining switches, the number of switches turned on being dependent on a digital signal (DIG). The start position determination circuit (3) sequentially changes the switches (S1, S3, S5, . . . ) serving as a selection start position to determine the selection start position for each input of the digital signal (DIG) provided in synchronism with a clock signal (CLK).

摘要翻译： 提供了一种提高模拟输出相对于数字输入的线性度的多位D / A转换器。 开关控制电路（1）接通D开始的开关位置确定电路（3）确定的开关的升序排列的多个开关（S1至SM）中的一些，并且关闭其余的开关 开关依赖于数字信号（DIG）。 开始位置确定电路（3）顺序地改变用作选择开始位置的开关（S1，S3，S5 ...），以确定与设置的与数字信号（DIG）同步的数字信号（DIG）的每个输入的选择开始位置 时钟信号（CLK）。

公开(公告)号：US5629700A

公开(公告)日：1997-05-13

申请号：US552016

申请日：1995-11-02

申请人： Toshio Kumamoto ,  Osamu Matsumoto ,  Takahiro Miki ,  Masao Ito ,  Takashi Okuda

发明人： Toshio Kumamoto ,  Osamu Matsumoto ,  Takahiro Miki ,  Masao Ito ,  Takashi Okuda

IPC分类号： H03M1/14 ,  H03M1/00 ,  H03M1/06 ,  H03M1/12 ,  H03M1/16 ,  H03M1/44 ,  H03M1/34

CPC分类号： H03M1/002 ,  H03M1/0682 ,  H03M1/069 ,  H03M1/1215 ,  H03M1/167

摘要： An A/D converter block A/D1 converts an analog input signal Vin to a digital signal and outputs its D/A output. First SH/SUBT7, 8 sample the signal Vin and a voltage VRM at the same timing with said A/D conversion and output the results of subtraction of the respective sampling values and the D/A output during holding, respectively. The both results of subtraction are several tens mV and there is no need of taking account of the linearity of a differential amplifier DIFF11. During the sampling, a circuit SHR1 outputs the differential voltages between each reference tap voltage taken out from specific 2 points of the ladder-type resistor in the A/D converter block A/D1 and the voltage VRM while a differential amplifier DIFF12 applies the reference voltages to the next A/D converter block A/D2. Such operations are performed in each stage. Thus, it becomes possible to make any S/H circuit and amplifier of excellent linearity in the first stage unnecessary to reduce the electric power consumption.

摘要翻译： A / D转换器模块A / D1将模拟输入信号Vin转换为数字信号并输出​​其D / A输出。 第一SH / SUBT7,8以与所述A / D转换相同的定时采样信号Vin和电压VRM，并分别输出相应采样值和保持期间的D / A输出的结果。 减法的结果都是几十mV，不需要考虑差分放大器DIFF11的线性度。 在采样期间，电路SHR1输出从A / D转换器模块A / D1中的梯形电阻器的特定2点取出的每个参考分接电压与电压VRM之间的差分电压，而差分放大器DIFF12施加参考 电压到下一个A / D转换器模块A / D2。 这样的操作在每个阶段进行。 因此，可以使得在第一级中具有优异线性度的任何S / H电路和放大器不必减少电力消耗。

公开(公告)号：US5936434A

公开(公告)日：1999-08-10

申请号：US912813

申请日：1997-08-19

申请人： Toshio Kumamoto ,  Masao Ito ,  Takahiro Miki ,  Takashi Okuda

发明人： Toshio Kumamoto ,  Masao Ito ,  Takahiro Miki ,  Takashi Okuda

IPC分类号： H03M1/34 ,  H03F3/45 ,  H03K5/08 ,  H03K5/24 ,  H03K5/153

CPC分类号： H03K5/249 ,  H03K5/2481

摘要： An object is to obtain a voltage comparator capable of high-accuracy voltage comparison. An input voltage (VIN) and a reference voltage (VREF) are connected to one electrode of a capacitor (C1) through switches (S1) and (S2), respectively. The other electrode of the capacitor (C1) is connected to the input portion of an inverter (INV1). The output portion of the inverter (INV1) is connected to the input portion of an inverter (INV3) and is also fed back to the input through a switch (S3). An inverter (INV11) is further connected in parallel with the inverter (INV1), wherein the input/output characteristics of the inverters (INV1, INV3 and INV11) are set equal.

摘要翻译： 目的是获得能够进行高精度电压比较的电压比较器。 分别通过开关（S1）和（S2）将输入电压（VIN）和参考电压（VREF）连接到电容器（C1）的一个电极。 电容器（C1）的另一个电极连接到逆变器（INV1）的输入部分。 逆变器（INV1）的输出部分连接到逆变器（INV3）的输入部分，并通过开关（S3）反馈到输入端。 反相器（INV11）进一步与反相器（INV1）并联连接，其中反相器（INV1，INV3和INV11）的输入/输出特性被设定为相等。

公开(公告)号：US06522007B2

公开(公告)日：2003-02-18

申请号：US09974856

申请日：2001-10-12

申请人： Hiroyuki Kouno ,  Toshio Kumamoto ,  Takahiro Miki ,  Hisayasu Satoh

发明人： Hiroyuki Kouno ,  Toshio Kumamoto ,  Takahiro Miki ,  Hisayasu Satoh

IPC分类号： H01L2348

CPC分类号： H01L27/08 ,  H01L21/31053 ,  H01L21/76819 ,  H01L21/76838 ,  H01L21/823437 ,  H01L23/5227 ,  H01L23/528 ,  H01L29/42372 ,  H01L2924/0002 ,  H01L2924/3011 ,  H01L2924/00

摘要： A gate electrode has a relatively long gate length of e.g., about 10 &mgr;m. In a region immediately above the gate electrode which is sandwiched between first-layer metals provided is a metal dummy pattern having a width in the first direction and extending in the second direction perpendicular to a direction of gate length (direction of current flow). Moreover, a geometric center of the metal dummy pattern in the second direction is equal to a geometric center of the gate electrode in the second direction. This maintains the symmetry in shape of the metal dummy pattern as viewed from the gate electrode. Such a structure can make deterioration in characteristics of a plurality of elements uniform while maintaining the essential effect of a metal CMP.

摘要翻译： 栅电极具有例如约10μm的较长栅极长度。 在夹在所提供的第一层金属之间的栅电极正上方的区域是具有第一方向的宽度并且沿与栅极长度方向（电流方向）垂直的第二方向延伸的金属虚设图案。 此外，第二方向上的金属虚设图案的几何中心等于栅电极在第二方向上的几何中心。 这保持了从栅电极观察时的金属虚设图形的对称性。 这样的结构可以使多个元件的特性劣化，同时保持金属CMP的基本效果。

公开(公告)号：US5345237A

公开(公告)日：1994-09-06

申请号：US77932

申请日：1993-06-18

申请人： Hiroyuki Kouno ,  Takahiro Miki ,  Toshio Kumamoto

发明人： Hiroyuki Kouno ,  Takahiro Miki ,  Toshio Kumamoto

IPC分类号： H03F3/45 ,  H03M1/14 ,  H03M1/36 ,  H03M1/34

CPC分类号： H03M1/146 ,  H03F3/45071 ,  H03M1/365

摘要： The present invention is directed to improvement of a differential amplifier an its peripheral components employed in an A/D converter to enhance an accuracy of the A/D converter. The differential amplifier has an amplifying element comprised of a pair of differential transistors Q1 and Q2, emitter resistances 2a and 2b, and collector resistances 2c and 2d. The differential amplifier has transistors Q3 and Q4 constituting an emitter follower for applying an output amplified in the differential amplifying element to the outside. The differential amplifier includes transistors Q5 and Q6 having their respective base electrodes connected to input terminals 4a and 4b and serially connected to the transistors Q3 and Q4, and resistances 2e and 2f interposed between emitter electrodes of the transistors Q5 and Q6 so as to relieve any influence of variations in base-emitter voltages of the transistors Q3 and Q4. Effectively an output from the emitter follower can be improved and a gain of the differential amplifier and linearity can be also improved.

摘要翻译： 本发明旨在改进差分放大器及其在A / D转换器中采用的周边部件，以提高A / D转换器的精度。 差分放大器具有由一对差分晶体管Q1和Q2，发射极电阻2a和2b以及集电极电阻2c和2d组成的放大元件。 差分放大器具有构成射极跟随器的晶体管Q3和Q4，用于将在差分放大元件中放大的输出施加到外部。 差分放大器包括具有连接到输入端子4a和4b并且串联连接到晶体管Q3和Q4的各自的基极的晶体管Q5和Q6，以及夹在晶体管Q5和Q6的发射极之间的电阻2e和2f，以便减轻任何 晶体管Q3和Q4的基极 - 发射极电压变化的影响。 有效地提高了射极跟随器的输出，并且还可以提高差分放大器的增益和线性度。

公开(公告)号：US5283581A

公开(公告)日：1994-02-01

申请号：US952413

申请日：1992-09-29

申请人： Takahiro Miki ,  Toshio Kumamoto

发明人： Takahiro Miki ,  Toshio Kumamoto

IPC分类号： H03M1/14 ,  G06G7/14 ,  H03M1/16 ,  H03M1/74

CPC分类号： H03M1/167 ,  G06G7/14 ,  H03M1/747

摘要： An analog voltage subtracting circuit for calculating a difference between an analog input voltage and a voltage drop caused by a load includes an analog voltage generator 7 for generating an analog voltage, a load 3 having one end connected to an output of the analog voltage generator 7 and the other end connected to an output terminal 2, and a D/A converter 6 applying a positive output current Iout for generating a desired voltage drop at said the other end 4 of the load 3 and for applying a complementary output current Iout complementary to the positive output current Iout to said one end of the load 3. By this structure, a constant current of Iout+Iout flows at said one end 4 of the load 3, and therefore linear output can be provided.

摘要翻译： 用于计算模拟输入电压和由负载引起的电压降之间的差的模拟电压减去电路包括用于产生模拟电压的模拟电压发生器7，一端连接到模拟电压发生器7的输出的负载3 并且另一端连接到输出端子2和D / A转换器6，D / A转换器6施加正输出电流Iout，用于在负载3的另一端4处产生期望的电压降，并且用于施加互补的输出电流I ）与负载3的所述一端的正输出电流Iout互补。通过这种结构，Iout + I（OVS）的恒定电流在负载3的所述一端4处流动，因此可以提供线性输出。

公开(公告)号：US5469047A

公开(公告)日：1995-11-21

申请号：US311433

申请日：1994-09-26

申请人： Toshio Kumamoto ,  Takahiro Miki ,  Hiroyuki Kouno

发明人： Toshio Kumamoto ,  Takahiro Miki ,  Hiroyuki Kouno

IPC分类号： G05F3/16 ,  G05F3/20

CPC分类号： G05F3/20

摘要： In order to obtain a constant current circuit which has an excellent constant current property and requires no plural bias circuits, a base of an NPN bipolar transistor (5) and a gate of an N-channel MOS transistor (6) are connected to a first terminal (1) in common. A collector of the transistor (5) is connected to a second terminal (2) and a source of a transistor (6) is connected to a third terminal respectively, while a voltage source (59) is connected between the first and third terminals. An emitter of the transistor (5) is connected with a drain of the transistor (6). Identical bias voltages are supplied to the base and the gate, while a gate-to-drain voltage of the transistor (6) is equal to a base-to-emitter voltage of the transistor (5). Thus, the transistor (6) operates in a pentode region, to serve as a constant current load for the transistor (5).

摘要翻译： 为了获得具有优异的恒定电流特性并且不需要多个偏置电路的恒流电路，NPN双极晶体管（5）的基极和N沟道MOS晶体管（6）的栅极连接到第一 终端（1）共同点。 晶体管（5）的集电极连接到第二端子（2），并且晶体管（6）的源极分别连接到第三端子，而电压源（59）连接在第一和第三端子之间。 晶体管（5）的发射极与晶体管（6）的漏极连接。 相同的偏置电压被提供给基极和栅极，而晶体管（6）的栅极 - 漏极电压等于晶体管（5）的基极 - 发射极电压。 因此，晶体管（6）工作在五极管区域，用作晶体管（5）的恒定电流负载。

公开(公告)号：US5341037A

公开(公告)日：1994-08-23

申请号：US886904

申请日：1992-05-22

申请人： Takahiro Miki ,  Toshio Kumamoto

发明人： Takahiro Miki ,  Toshio Kumamoto

IPC分类号： G11C27/02 ,  H03K5/159

CPC分类号： G11C27/026 ,  G11C27/024

摘要： Positive and negative output ends of a differential circuit in a sample hold circuit are connected to capacitors through switch circuits. Further, collectors of two input transistors of a buffer circuit connected to the sample hold circuit are driven by a collector driving differential circuit, so as to make the collector.multidot.base voltages of two input transistors same to each other. Consequently, a stable sample hold circuit having an arbitrary gain can be provided. In addition, drifts of outputs from two capacitors in the sample hold circuit can be made equal to each other by the buffer circuit.

摘要翻译： 采样保持电路中的差分电路的正和负输出端通过开关电路连接到电容器。 此外，连接到采样保持电路的缓冲电路的两个输入晶体管的集电极由集电极驱动差分电路驱动，以使两个输入晶体管的集电极基极彼此相同。 因此，可以提供具有任意增益的稳定的采样保持电路。 此外，可以通过缓冲电路将采样保持电路中的两个电容器的输出漂移相互相等。

公开(公告)号：US5313207A

公开(公告)日：1994-05-17

申请号：US71497

申请日：1993-06-04

申请人： Hiroyuki Kouno ,  Takahiro Miki ,  Toshio Kumamoto

发明人： Hiroyuki Kouno ,  Takahiro Miki ,  Toshio Kumamoto

IPC分类号： H03F3/45 ,  G06G7/14 ,  H03F3/72 ,  H03M1/14 ,  H03M1/34 ,  H03M1/36 ,  H03M1/12

CPC分类号： H03M1/164 ,  G06G7/14 ,  H03F3/72

摘要： An improved differential subtracter 3a and an improved D/A converter 7a are used in a two-step parallel A/D converter 100. The D/A converter is responsive to complementary signals S1-S2 and B1-Bn indicative of results of conversion of higher bits to draw subtraction currents Is1 and Is2 through emitter electrodes of npn transistors Q1 and Q2. Since a difference between emitter currents I.sub.E1 and I.sub.E2 is small, base-emitter voltages V.sub.BE1 and V.sub.BE2 are substantially equal to each other. As a result, the A/D converter can execute the subtraction at high speed with high accuracy.

摘要翻译： 改进的差分减法器3a和改进的D / A转换器7a用于两级并行A / D转换器100.D / A转换器响应于指示转换结果的互补信号S1-S2和B1-Bn 较高位以通过npn晶体管Q1和Q2的发射极来减去电流Is1和Is2。 由于发射极电流IE1和IE2之间的差异小，所以基极 - 发射极电压VBE1和VBE2基本相等。 因此，A / D转换器可以高精度地执行减法。