Method of programming a desired source resistance for a driver stage
    1.
    发明授权
    Method of programming a desired source resistance for a driver stage 失效
    编程驱动级的所需源电阻的方法

    公开(公告)号:US5581197A

    公开(公告)日:1996-12-03

    申请号:US455473

    申请日:1995-05-31

    CPC分类号: H03K19/0005

    摘要: The output impedance in a CMOS output driver stage is programmed and compensated by complementary current mirrors that are MOS devices in series with each of the conventional pull-up and pull-down devices. The conduction of these additional complementary devices is controlled according to complementary programming signals that are compensated for variations in manufacturing process parameters as well as for changes in temperature. A P-type programming signal may be referenced to +VDD and be produced from an N-type programming signal referenced to GND by the action of a gate voltage mirror that includes symmetrical N-type and P-type FET's in series. The N-type programming signal may be produced in the first instance from the gate voltage of an N-type FET used in a feedback loop that servos an external programming voltage to track an internally generated reference voltage. That gate voltage exhibits variations that reflect differences attributable to both process variations and to temperature. Those exhibited variations are communicated by a current mirror to a gate voltage mirror that produces the complementary programming signals, and which themselves constitute negative feedback. The complementary current mirrors are of known of gain, which in conjunction with knowing the value of VDD, allows the determination in advance of a definite table of programming resistance values versus output impedances.

    摘要翻译: CMOS输出驱动级中的输出阻抗由与常规上拉和下拉器件中的每一个串联的MOS器件的互补电流镜进行编程和补偿。 根据互补编程信号来控制这些额外的互补器件的导通,补偿编程信号被补偿制造工艺参数的变化以及温度变化。 P型编程信号可以参考+ VDD,并且由通过包括对称N型和P型FET串联的栅极电压反射镜的作用而由参考于GND的N型编程信号产生。 N型编程信号可以从伺服外部编程电压以跟踪内部产生的参考电压的反馈环路中使用的N型FET的栅极电压首先产生。 该栅极电压表现出反映由于工艺变化和温度导致的差异的变化。 那些显示的变化通过电流镜传送到产生互补编程信号的栅极电压镜,并且它们本身构成负反馈。 互补电流镜是已知的增益,其结合知道VDD的值,允许在编程电阻值与输出阻抗的确定表之前进行确定。

    Adaptable programmed calculator including a percent keyboard operator
    2.
    发明授权
    Adaptable programmed calculator including a percent keyboard operator 失效
    适应性编程计算器包括百分比键盘操作员

    公开(公告)号:US4181966A

    公开(公告)日:1980-01-01

    申请号:US681291

    申请日:1976-04-28

    IPC分类号: G06F15/02 G06F7/48

    CPC分类号: G06F15/02

    摘要: An adaptable calculator is provided by employing five MOS/LSI circuits interconnected by a multiple line bus system. They include (1) a read-only memory circuit group; (2) a control and timing circuit; (3) an arithmetic and register circuit; (4) a data storage circuit; and (5) an input/output (I/O) circuit. Input and output units include a keyboard input unit and an 18-column output printer unit for printing intermediate results of calculations, entered data, arithmetic operators, and diagnostic notes. The keyboard input unit includes a PERCENT key that may be employed in combination with any of four arithmetic operator keys. The calculator may be operated manually by the user from the keyboard input unit or automatically by a program written in user-level language and stored in a plug-in read-only memory unit (ROM), a plug-in programmable read-only memory unit (PROM) or a read/write memory unit associated with a plug-in magnetic card reading and recording unit.

    摘要翻译: 通过采用由多线总线系统互连的五个MOS / LSI电路提供了一个可适应的计算器。 它们包括(1)只读存储器电路组; (2)控制和定时电路; (3)算术和寄存器电路; (4)数据存储电路; 和(5)输入/输出(I / O)电路。 输入和输出单元包括键盘输入单元和用于打印中间计算结果,输入数据,算术运算符和诊断说明的18列输出打印机单元。 键盘输入单元包括可以与四个算术运算器键中的任何一个组合使用的PERCENT键。 计算器可以由用户从键盘输入单元手动操作,或者由用户级语言编写的程序自动操作,并存储在插件只读存储器单元(ROM),插入式可编程只读存储器 单元(PROM)或与插入式磁卡读取和记录单元相关联的读/写存储器单元。

    Adaptable programmed calculator having provision for plug-in keyboard
and memory modules
    4.
    发明授权
    Adaptable programmed calculator having provision for plug-in keyboard and memory modules 失效
    适应性编程计算器提供插件键盘和内存模块

    公开(公告)号:US3971925A

    公开(公告)日:1976-07-27

    申请号:US477552

    申请日:1974-06-06

    IPC分类号: G06F15/02 G06F15/06

    CPC分类号: G06F15/02

    摘要: An adaptable calculator is provided by employing five MOS/LSI circuits interconnected by a multiple line bus system. They include (1) a read-only memory circuit group in which subroutines for performing arithmetic and other functions of a basic keyboard input unit are stored; (2) a control and timing circuit for scanning the keyboard, for retaining status information relating to the condition of the calculator or of a particular subroutine, and for generating a next address in read-only memory; (3) an arithmetic and register circuit containing an adder, a group of working registers, a group of data storage registers forming a stack, and a constant storage register; (4) a data storage circuit which provides ten data storage registers, nine of which are employed by the calculator system and one of which is available to the user for storing data; and (5) an input/output (I/O) circuit for enabling the calculator to communicate with various I/O peripheral units such as a typewriter and an X-Y plotter, for performing binary arithmetic by means of a binary arithmetic logic unit contained therein, and for performing various system housekeeping operations.Input and output units include a keyboard input unit having a receptacle for accommodating a 15-key function block to enlarge the capabilities of the calculator and an 18-column output printer unit for printing intermediate results of calculations, entered data, arithmetic operators, and diagnostic notes. An optional 15-digit seven-segment light emitting diode (LED) output display unit may be inserted into the calculator mainframe. All of these input and output units are included within the calculator itself. An X-Y plotter, a typewriter, a marked sense card reader, an extended data storage memory, a magnetic card reading and recording unit, a ASCII bus for enabling the calculator to communicate with data gathering instruments, and many other peripheral input and output units may also be employed with the calculator.The calculator may be operated manually by the user from the keyboard input unit or automatically by a program written in user-level language and stored in a plug-in read-only memory unit (ROM), a plug-in programmable read-only memory unit (PROM) or a read/write memory unit associated with a plug-in magnetic card reading and recording unit.

    摘要翻译: 通过采用由多线总线系统互连的五个MOS / LSI电路提供了一个可适应的计算器。 它们包括(1)一个只读存储器电路组,其中存储用于执行基本键盘输入单元的算术和其他功能的子程序; (2)用于扫描键盘的控制和定时电路,用于保持与计算器或特定子程序的状况相关的状态信息,以及用于在只读存储器中生成下一个地址; (3)包含加法器,一组工作寄存器,一组形成堆栈的数据存储寄存器组和恒定存储寄存器的算术和寄存器电路; (4)数据存储电路,其提供十个数据存储寄存器,其中九个由计算器系统采用,其中一个可供用户存储数据; 以及(5)用于使计算器能够与诸如打字机和XY绘图仪的各种I / O外围单元通信的输入/输出(I / O)电路,用于通过其中包含的二进制运算逻辑单元进行二进制运算 ,并执行各种系统内务操作。