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    • 2. 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。
    • 3. 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。
    • 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。
    • 9. 发明授权
    • Analog-to-digital converter of an annular configuration
    • 具有环形配置的模数转换器
    • US5317312A
    • 1994-05-31
    • US990488
    • 1992-12-14
    • Hiroyuki KounoMinobu YazawaToshio Kumamoto
    • Hiroyuki KounoMinobu YazawaToshio Kumamoto
    • H03M1/34H03M1/36
    • H03M1/365
    • An A/D converter main body is formed in the form of an annulus with a wiring region set as its center, and a ladder resistor array for dividing an input reference voltage and an analog signal line for applying an input analog signal to each comparator in the A/D converter are formed in the form of an annulus with the wiring region set as a center. Wirings from terminals are once concentrated into the wiring region by an input/output line group and then distributed therefrom to circuit elements. Since the ladder resistor array is formed in a circular form, resistance values are less liable to change as compared to the case where the ladder resistor array is bent, resulting in a higher precision of reference voltages for comparison. Further, wiring lengths for control signals to be applied to the circuit elements are made equal, and there is no fear of line delays in the control signals.
    • A / D转换器主体形成为以布线区域为中心的环形的形式,以及用于分割输入参考电压的梯形电阻阵列和用于将输入的模拟信号施加到每个比较器的模拟信号线 A / D转换器形成为以布线区域为中心的环形的形式。 来自端子的布线一旦通过输入/输出线组集中到布线区域中,然后从电缆元件分布。 由于梯形电阻器阵列形成为圆形形式,所以与梯形电阻器阵列弯曲的情况相比,电阻值不易变化,因此比较了较高的基准电压精度。 此外,使施加到电路元件的控制信号的布线长度相等,并且不必担心控制信号中的线路延迟。