Convertible oscillator circuit
    1.
    发明授权
    Convertible oscillator circuit 失效
    可转换振荡电路

    公开(公告)号:US5311150A

    公开(公告)日:1994-05-10

    申请号:US947200

    申请日:1992-09-18

    CPC分类号: H03K3/0231

    摘要: An integrated oscillator includes an amplifier having first and second voltage inputs, and first and second current outputs, and a current mirror having an input coupled to the second current output of the amplifier and an output coupled to the first current output of the amplifier. The output of the current mirror and the first current output of the amplifier are coupled through a bonding pad to an external capacitor. A first comparator has a first input coupled to the first current output of the amplifier and a second input for receiving a first threshold voltage, and a second comparator has a first input coupled to the first current output of the amplifier and a second input for receiving a second threshold voltage. A flip-flop has a first input coupled to the output of the first comparator, a second input, and an output coupled to the second voltage input of the amplifier. A first multiplexer has a first input for receiving a reference voltage, a second input coupled to the output of the second comparator, and an output coupled to the first voltage input of the amplifier. A second multiplexer has a first input coupled to the output of the second comparator, a second input for receiving an enable signal, and an output coupled to the second input of the flip-flop. The output of the second comparator forms a one-shot output node responsive to the enable signal, and the output of the flip-flop forms a free-running oscillator output node.

    摘要翻译: 集成振荡器包括具有第一和第二电压输入以及第一和第二电流输出的放大器,以及具有耦合到放大器的第二电流输出的输入的电流镜和耦合到放大器的第一电流输出的输出。 电流镜的输出和放大器的第一电流输出通过焊盘耦合到外部电容器。 第一比较器具有耦合到放大器的第一电流输出的第一输入端和用于接收第一阈值电压的第二输入端,第二比较器具有耦合到放大器的第一电流输出的第一输入端和用于接收的第二输入端 第二阈值电压。 触发器具有耦合到第一比较器的输出的第一输入,第二输入和耦合到放大器的第二电压输入的输出。 第一多路复用器具有用于接收参考电压的第一输入端,耦合到第二比较器的输出端的第二输入端和耦合到放大器的第一电压输入端的输出端。 第二多路复用器具有耦合到第二比较器的输出的第一输入端,用于接收使能信号的第二输入端和耦合到触发器的第二输入端的输出端。 第二比较器的输出响应于使能信号形成单触发输出节点,并且触发器的输出形成自由运行的振荡器输出节点。

    Simplified user interface and control system for a multimeter
    2.
    发明授权
    Simplified user interface and control system for a multimeter 失效
    用于万用表的简化用户界面和控制系统

    公开(公告)号:US06218824B1

    公开(公告)日:2001-04-17

    申请号:US09074444

    申请日:1998-05-07

    IPC分类号: G01R1508

    CPC分类号: G01R15/125 G01R13/02

    摘要: A simplified user interface for an electronic test and measurement device comprises an arrangement of a segmented LCD device and a plurality of keys used to implement a softkey system, in combination with a single AMPs input connector and a rotary selector having only a single position for each basic kind of parameter to be measured. The segmented LCD device includes, at each location adjacent to a key, a plurality of segments representing a vertically-arranged list of functions to be controlled. In one embodiment of the invention, the housing of the electronic test and measurement device is fabricated to have finger-like projections overlaying a portion of the LCD screen for creating the appearance of the continuation of displayed LCD softkey separation lines.

    摘要翻译: 用于电子测试和测量装置的简化的用户界面包括分段LCD装置和用于实现软键系统的多个键的结构,其结合单个AMP输入连接器和仅具有用于每个的单个位置的旋转选择器 要测量的基本类型的参数。 分段LCD装置在与键相邻的每个位置处包括表示垂直排列的要被控制的功能列表的多个段。 在本发明的一个实施例中,电子测试和测量装置的壳体被制造成具有覆盖LCD屏幕的一部分的手指状突起,用于产生显示的LCD软键分离线的延续的外观。