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    • 1. 发明授权
    • Multiple current digital-analog converter capable of reducing output
glitch
    • 多电流数字模拟转换器可以减少输出毛刺
    • US5689258A
    • 1997-11-18
    • US532315
    • 1995-09-21
    • Yasuyuki NakamuraHiroyuki KounoTakahiro Miki
    • Yasuyuki NakamuraHiroyuki KounoTakahiro Miki
    • H03M1/08H03M1/74H03M1/66
    • H03M1/0863H03M1/747
    • A digital-analog converter has unit current source cells each having a differential switch circuit and a constant current source. The differential switch circuit made of two switches is driven by a pair of complementary driving circuits controlled by a bit signal and the inverted bit signal corresponding to that signal and entered simultaneously. The constant current source outputs a constant current to a first and a second current output terminal via the switch circuit. The signals for controlling the driving circuits that drive the switches are such that the delay time for the switch closing operation will be longer than the delay time for the switch opening operation. As a result, the cross point of the two signals to open and close the switches in a complementary manner becomes greater than the median between the maximum and minimum signal levels. That is, even when the threshold value of a currently switching transistor is greater than a median, that value may be arranged to match the median, whereby the furnished switching transistors are not turned on or off simultaneously.
    • 数模转换器具有单元电流源单元,每个单元具有差分开关电路和恒流源。 由两个开关构成的差分开关电路由一对由位信号控制的互补驱动电路和对应于该信号的反相位信号驱动并同时输入。 恒流源通过开关电路向第一和第二电流输出端输出恒定电流。 用于控制驱动开关的驱动电路的信号使得开关闭合操作的延迟时间将长于开关操作的延迟时间。 结果,以互补方式打开和闭合开关的两个信号的交叉点变得大于最大和最小信号电平之间的中值。 也就是说,即使当当前开关晶体管的阈值大于中值时,也可以将该值设置为与中值相匹配,由此所提供的开关晶体管不会同时导通或截止。
    • 2. 发明授权
    • Output buffer circuit for interfacing semiconductor integrated circuits
operating on different supply voltages
    • 用于连接在不同电源电压下工作的半导体集成电路的输出缓冲电路
    • US5631579A
    • 1997-05-20
    • US548066
    • 1995-10-25
    • Takahiro MikiHiroyuki KounoYasuyuki Nakamura
    • Takahiro MikiHiroyuki KounoYasuyuki Nakamura
    • G06F3/00G11C11/409H01L27/02H03K19/003H03K19/0175H03K19/0185
    • H03K19/00315H01L27/0251
    • An output buffer circuit operating normally when its supply potential is exceeded by the potential of the bus to which the buffer circuit output is connected. The circuit comprises a p-channel MOS transistor and a first and a second n-channel MOS transistor. The output node of the output buffer circuit is connected not to the p-channel MOS transistor but to the connection point between the source of the first n-channel MOS transistor and the drain of the second n-channel MOS transistor. The threshold potential of the first n-channel MOS transistor is set so that, with the output node in the high-impedance state, the first n-channel MOS transistor is turned off when the output node potential exceeds the supply potential of the output buffer circuit. This prevents the p-channel MOS transistor from getting activated or from being forward-biased between the back gate and the drain or source. Thus no leak current flows when the bus potential becomes higher than the supply potential of the output buffer circuit.
    • 当缓冲电路输出的总线的电位超过其电源电位时,输出缓冲电路正常工作。 电路包括p沟道MOS晶体管和第一和第二n沟道MOS晶体管。 输出缓冲电路的输出节点不连接到p沟道MOS晶体管,而是连接到第一n沟道MOS晶体管的源极和第二n沟道MOS晶体管的漏极之间的连接点。 第一n沟道MOS晶体管的阈值电位被设置为使得当输出节点处于高阻抗状态时,当输出节点电位超过输出缓冲器的供给电位时,第一n沟道MOS晶体管截止 电路。 这防止了p沟道MOS晶体管在背栅极和漏极或源极之间被激活或被正向偏置。 因此,当总线电位变得高于输出缓冲电路的电源电位时,没有泄漏电流流动。
    • 4. 发明授权
    • Transistor circuit
    • 晶体管电路
    • US5469047A
    • 1995-11-21
    • US311433
    • 1994-09-26
    • Toshio KumamotoTakahiro MikiHiroyuki Kouno
    • Toshio KumamotoTakahiro MikiHiroyuki Kouno
    • G05F3/16G05F3/20
    • G05F3/20
    • 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).
    • 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。
    • 7. 发明授权
    • Differential amplifier and two-step parallel A/D converter
    • 差分放大器和两级并行A / D转换器
    • US5345237A
    • 1994-09-06
    • US77932
    • 1993-06-18
    • Hiroyuki KounoTakahiro MikiToshio Kumamoto
    • Hiroyuki KounoTakahiro MikiToshio Kumamoto
    • H03F3/45H03M1/14H03M1/36H03M1/34
    • H03M1/146H03F3/45071H03M1/365
    • 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.
    • 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。
    • 8. 发明授权
    • Series-parallel type A-D converter for realizing high speed operation
and low power consumption
    • 串并联型A-D转换器,实现高速运行和低功耗
    • US5539406A
    • 1996-07-23
    • US264676
    • 1994-06-23
    • Hiroyuki KounoToshio KumamotoTakahiro Miki
    • Hiroyuki KounoToshio KumamotoTakahiro Miki
    • H03M1/06H03M1/14H03M1/36H03M1/76H03M1/12
    • H03M1/146H03M1/0682H03M1/365H03M1/765
    • An upper comparator group compares an analog signal with upper reference potentials applied from upper ladder resistance network. A switch group outputs the predetermined intermediate reference potential of the ladder resistance network to an analog subtracting circuit in response to the upper comparison results. The analog subtracting circuit subtracts the intermediate reference potential from the analog signal for producing an input signal for use in the lower side. A lower ladder resistance network outputs lower reference potentials obtained by dividing by resistors constant static intermediate reference potentials of the ladder resistance network applied from a differential amplifying circuit. A lower comparator group compares the lower reference potentials with the input signal for lower comparison. The upper and the lower comparison results are converted into a digital signal by upper and the lower encoders and the adding/subtracting circuit.
    • 上比较器组将模拟信号与上梯形电阻网络施加的较高参考电位进行比较。 开关组响应于较高的比较结果将梯形电阻网络的预定中间参考电位输出到模拟减法电路。 模拟减法电路从用于产生用于下侧的输入信号的模拟信号中减去中间参考电位。 下梯形电阻网络通过将电阻除以由差分放大电路施加的梯形电阻网络的恒定静态中间参考电位而得到的较低参考电位。 较低的比较器组将较低的参考电位与输入信号进行比较,用于较低的比较。 上下比较结果由上下编码器和加减电路转换成数字信号。