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    • 43. 发明授权
    • Trim circuitry and method for accuracy in current sensing
    • 修剪电路和电流检测精度的方法
    • US5867001A
    • 1999-02-02
    • US925242
    • 1997-09-08
    • Rolf LagerquistWilliam R. KrenikKenneth J. MaggioPatrick G. O'Farrell
    • Rolf LagerquistWilliam R. KrenikKenneth J. MaggioPatrick G. O'Farrell
    • G01R19/00H02P6/00H02P6/10H02P7/00
    • H02P6/10H02P6/28
    • A motor driver circuit (12) for providing drive signals to stator coils of a polyphase dc motor (10) includes a plurality of current paths, each connected between a supply voltage and a reference potential. Each current path includes two driver transistors (14,20, 16,22, 18,24), a node (A, B, C) of each of the stator coils being connectable between the driver transistors in respective current flow paths. A commutator (26) is connected to operate the driver transistors in a sequence in which drive currents are delivered for application in a predetermined sequence to the stator coils. A plurality of sensing transistors (32) are connected to produce a mirror current which mirrors a mirrored current in an associated driver transistor (20) in a respective current flow path. Circuitry (26) is provided which is responsive to the mirror currents of the sensing transistors to control the amplitudes of the currents in the associated driver transistor in a respective current flow path. At least one trim transistor (51-55) is connected in parallel with a respective one of the sensing transistors (50), and a programmable circuit (48) is connected to selectively activate the at least one trim transistor to adjust the amplitudes of the mirrored currents in the current flow path with which the sensing transistor with which the at least one trim transistor is associated.
    • 用于向多相直流电动机(10)的定子线圈提供驱动信号的电机驱动器电路(12)包括多个电流路径,每个电流路径连接在电源电压和参考电位之间。 每个电流路径包括两个驱动器晶体管(14,20,16,22,18,24),每个定子线圈的节点(A,B,C)可在相应的电流流动路径中的驱动器晶体管之间连接。 换向器(26)被连接以按驱动电流被输送的顺序来操作驱动器晶体管,以便以预定顺序施加到定子线圈。 连接多个感测晶体管(32)以产生镜电流,其反映相应的电流流动路径中相关联的驱动晶体管(20)中的镜像电流。 提供电路(26),其响应于感测晶体管的镜像电流来控制相应的电流流动路径中相关联的驱动器晶体管中的电流的幅度。 至少一个微调晶体管(51-55)与感测晶体管(50)中的相应一个并联连接,并且可编程电路(48)被连接以选择性地激活所述至少一个修整晶体管以调整 电流流动路径中与至少一个修整晶体管相关联的感测晶体管的镜像电流。
    • 44. 发明授权
    • Sequential access memories, systems and methods
    • 顺序访问存储器,系统和方法
    • US5699087A
    • 1997-12-16
    • US333899
    • 1994-11-03
    • William R. KrenikLouis J. Izzi
    • William R. KrenikLouis J. Izzi
    • G09G5/06G06F12/00
    • G09G5/06
    • A method is provided for accessing data stored in memory (76). First data appearing at outputs (102) of memory (76) are read during a first reading cycle in a sequence of reading cycles, the first data retrieved from a first location in memory (76) corresponding to a first address. At the end of the first reading cycle, the first address is stepped to produce a second address corresponding to a second location in memory (76). During an idle period following the first reading cycle and prior to a second reading cycle occurring next in the sequence of reading cycles, second data is prefetched from the second location in memory (76) such that the second data appears at the bitlines (102) of memory (76) at the start of the second reading cycle.
    • 提供一种访问存储在存储器(76)中的数据的方法。 在第一读取周期期间以读取周期的顺序读出出现在存储器(76)的输出端(102)的第一数据,从存储器(76)中对应于第一地址的第一位置检索的第一数据。 在第一读取周期结束时,第一地址被步进以产生对应于存储器(76)中的第二位置的第二地址。 在第一读取周期之后的空闲时段期间和接下来在读取周期序列中发生第二读取周期之前,从存储器(76)中的第二位置预取第二数据,使得第二数据出现在位线(102)处, 的存储器(76)在第二读取周期的开始。
    • 46. 发明授权
    • Apparatus and method for accurately establishing a cut-off frequency in
an electronic filter
    • 在电子滤波器中精确建立截止频率的装置和方法
    • US5650950A
    • 1997-07-22
    • US455867
    • 1995-05-31
    • Patrick P. SiniscalchiWilliam R. KrenikMichael D. Aragon
    • Patrick P. SiniscalchiWilliam R. KrenikMichael D. Aragon
    • H03H17/02G06J1/00
    • H03H17/0294
    • A programmable, electronic filter (10) includes a memory device such as a Read Only Memory ROM (22) for storing specific cut-off frequency adjustment data corresponding to various cut-off frequencies. The ROM (22) receives a ROM address (28) corresponding to a cut-off frequency signal (26). The ROM (22) generates a specific cut-off frequency adjustment value (30) for a digital-to-analog convertor (20) to produce an output reference current (34). A reference voltage (40), an error amplifier (14), a master transconductance element (16), and a capacitor (18) serve as a tuning loop and ultimately produce a control signal (38) in response to the output reference current (34). Control signal (38) serves as an input to slave filter (12) along with the cut-off frequency signal (26). The slave filter (12) may then serve as an electronic filter having the desired frequency-response characteristic. The slave filter (12) may then receive a slave filter input signal (44) and provide a filtered output signal (46) having an accurate frequency-response characteristic at the desired cut-off frequency.
    • 可编程电子滤波器(10)包括诸如只读存储器ROM(22)的存储器件,用于存储对应于各种截止频率的特定截止频率调节数据。 ROM(22)接收对应于截止频率信号(26)的ROM地址(28)。 ROM(22)产生用于数模转换器(20)的特定截止频率调整值(30)以产生输出参考电流(34)。 参考电压(40),误差放大器(14),主跨导元件(16)和电容器(18)用作调谐回路,并且响应于输出参考电流(38)最终产生控制信号(38) 34)。 控制信号(38)与截止频率信号(26)一起用作从滤波器(12)的输入。 然后,从滤波器(12)可以用作具有期望的频率响应特性的电子滤波器。 然后,从滤波器(12)可接收从滤波器输入信号(44),并提供具有所需截止频率的精确频率响应特性的滤波输出信号(46)。
    • 48. 发明授权
    • Constant capacitance prgrammable transconductance input stage
    • 恒电容可编程跨导输入级
    • US5528179A
    • 1996-06-18
    • US455815
    • 1995-05-31
    • Patrick P. SiniscalchiWilliam R. Krenik
    • Patrick P. SiniscalchiWilliam R. Krenik
    • H03G1/00H03H11/04G06G7/12
    • H03G1/0023H03H11/0433H03H11/0472
    • A constant capacitance programmable transconductance input stage (36) includes a first transconductance device (50), second transconductance device (52), and first switch (44) for providing a programmable input stage with a constant input capacitance. The first transconductance device (50) has two inputs and the second transconductance device (52) has two inputs. A first positive input (22) couples directly to one input of the first transconductance device (50) while a first negative input (23) couples directly to one input of the second transconductance device (52). The first positive input (22) and the first negative input (23) are switchably coupled to the remaining inputs of first transconductance device (50) and second transconductance device (52). Depending on the configuration of the first switch (44), either both transconductance devices contribute to the overall transconductance of constant capacitance programmable transconductance input stage (36) or neither does. In either event, the input capacitance remains constant.
    • 恒定电容可编程跨导输入级(36)包括第一跨导器件(50),第二跨导器件(52)和用于向可编程输入级提供恒定输入电容的第一开关(44)。 第一跨导器件(50)具有两个输入端,第二跨导器件(52)具有两个输入端。 第一正输入端(22)直接耦合到第一跨导器件(50)的一个输入端,而第一负输入端(23)直接耦合到第二跨导器件(52)的一个输入端。 第一正输入(22)和第一负输入(23)可切换地耦合到第一跨导器件(50)和第二跨导器件(52)的剩余输入。 根据第一开关(44)的配置,两个跨导器件都有助于恒定电容可编程跨导输入级(36)的整体跨导,或者也不参与。 在任一情况下,输入电容保持恒定。