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    • 2. 发明授权
    • Comparator switching apparatus and method
    • 比较器开关装置及方法
    • US07215158B2
    • 2007-05-08
    • US11239083
    • 2005-09-30
    • Masahiro KitagawaKatsuhito TakeuchiHiroyuki Obata
    • Masahiro KitagawaKatsuhito TakeuchiHiroyuki Obata
    • H03K5/22H03K5/153
    • H03K5/24H03K19/0008
    • An operation switching circuit switches over two comparators, which receives communication data, in accordance with a normal mode and a standby mode of a microcomputer. A delay circuit delays a mode switching signal. The mode switching signal and the delayed signal are combined by an OR gate and an AND gate to two comparator control signals, which have different high level periods. The comparators are driven by the comparator control signals, while a multiplexer is driven by the delayed signal. When one comparator is switched from the inoperative state to the operative state, the other comparator is continued to be held operative for the delay period before being switched to the inoperative state.
    • 操作切换电路根据微型计算机的正常模式和待机模式切换接收通信数据的两个比较器。 延迟电路延迟模式切换信号。 模式切换信号和延迟信号通过或门和与门组合到具有不同高电平周期的两个比较器控制信号。 比较器由比较器控制信号驱动,而多路复用器由延迟信号驱动。 当一个比较器从非工作状态切换到工作状态时,另一个比较器在切换到非工作状态之前继续保持延迟时间。
    • 6. 发明授权
    • Circuit for supplying constant voltage
    • 提供恒压电路
    • US07071671B2
    • 2006-07-04
    • US10974769
    • 2004-10-28
    • Masahiro KitagawaAkio KojimaJunichi Nagata
    • Masahiro KitagawaAkio KojimaJunichi Nagata
    • G05F3/16
    • G05F3/242G05F1/573
    • A constant voltage supplying circuit including an output transistor is connected to a power source line and an output terminal. A base-emitter voltage of the output transistor is detected by a voltage detecting circuit composed of a transistor. A current-outputting circuit for supplying a current determined based on the voltage detected by the voltage detector to a reference voltage supplying circuit is used in the constant voltage supplying circuit. The reference voltage is supplied to a base of the output transistor to cancel a base-emitter voltage of the output transistor and to equalize the output voltage to a voltage generated in a reference voltage generating element included in the reference voltage supplying circuit. In this manner, the output voltage is kept constant notwithstanding variation of output current.
    • 包括输出晶体管的恒压供电电路连接到电源线和输出端。 输出晶体管的基极 - 发射极电压由由晶体管构成的电压检测电路来检测。 在恒压供给电路中使用用于将基于由电压检测器检测出的电压确定的电流提供给基准电压供给电路的电流输出电路。 参考电压被提供给输出晶体管的基极以消除输出晶体管的基极 - 发射极电压,并将输出电压与在参考电压供应电路中包括的参考电压产生元件中产生的电压相等。 以这种方式,尽管输出电流的变化,输出电压保持恒定。