公开(公告)号：US4417214A

公开(公告)日：1983-11-22

申请号：US253233

申请日：1981-04-13

申请人： Stylianos G. Sevastopoulos ,  Sammy S. Lum

发明人： Stylianos G. Sevastopoulos ,  Sammy S. Lum

IPC分类号： H03H19/00 ,  H03H11/12 ,  H03F1/34 ,  H03F3/68

CPC分类号： H03H11/1252

摘要： A general purpose active filter which can be fabricated as a single, monolithic IC. The IC includes two independent filter building blocks. Each filter block includes a pair of serially connected summers and a pair of serially connected switched capacitor positive integrators connected to the serial output of the summers. The IC further includes clock interface circuitry for receiving and conditioning first and second external clock signals. The interface circuitry drives the switches of the positive integrators of each filter block with one of the first and second conditioned clock signals. A plurality of input and output leads are interconnected with the components of each filter block to permit the filter blocks to be separately configured to perform various second order filter functions. The filter blocks may be tuned according to external resistance ratios and/or according to the frequencies of the external clock signals.

摘要翻译： 一种通用的有源滤波器，可以作为一个单片IC制造。 IC包括两个独立的过滤器构建块。 每个滤波器块包括一对串联连接的加法器和一对串联连接的开关电容正积分器，连接到该和的串行输出。 IC还包括用于接收和调理第一和第二外部时钟信号的时钟接口电路。 接口电路利用第一和第二调节时钟信号之一驱动每个滤波器块的正积分器的开关。 多个输入和输出引线与每个滤波器块的组件互连以允许滤波器块被单独配置以执行各种二阶滤波器功能。 可以根据外部电阻比和/或根据外部时钟信号的频率来调整滤波器块。

公开(公告)号：US5287525A

公开(公告)日：1994-02-15

申请号：US10477

申请日：1993-01-28

申请人： Sammy S. Lum ,  William C. Rempfer

发明人： Sammy S. Lum ,  William C. Rempfer

IPC分类号： G06F1/32 ,  G06F1/00

CPC分类号： G06F1/3246 ,  G06F1/3203

摘要： Power shutdown of an integrated circuit such as a data acquisition system is implemented by software command. In one embodiment of a data acquisition system, an 8 bit data input word for configuring the operation of the data acquisition system includes two word length bits which define the length of data output words. One combination of the word length bits is utilized to command power shutdown. A decoder within the integrated circuit identifies the power shutdown command and generates a power shutdown signal (PS) to minimize power consumption when the circuit is not in operation.

摘要翻译： 通过软件命令实现数据采集系统等集成电路的电源关闭。 在数据采集系统的一个实施例中，用于配置数据采集系统的操作的8位数据输入字包括限定数据输出字长度的两个字长比特位。 字长比特的一个组合被用于指令关机。 集成电路内的解码器识别电源关闭命令并产生电源关闭信号（PS），以在电路不工作时最小化功耗。

公开(公告)号：US5763924A

公开(公告)日：1998-06-09

申请号：US647361

申请日：1996-05-09

申请人： Sammy S. Lum ,  William C. Rempfer

发明人： Sammy S. Lum ,  William C. Rempfer

IPC分类号： G11C27/02 ,  H01L27/06 ,  H01L27/092 ,  H01L29/76 ,  H01L29/74

CPC分类号： G11C27/02 ,  G11C27/024 ,  H01L27/0629 ,  H01L27/092

摘要： A simple, low-cost circuit and method for line zing parasitic capacitances of transistor junctions, independent of the process technology employed, are provided. In the preferred embodiment, the parasitic capacitance of a transistor in a track and hold circuit is linearized by providing a pair of diodes that act inversely to the parasitic diodes formed within the integrated circuit during normal tracking operations. Without the diodes of the present invention, the varying input signals cause the parasitic capacitance to vary, thereby causing harmonic distortion in the track and hold circuit. An alternate embodiment of the present invention is also provided in which a second complementary transistor is provided. The inclusion of the complementary transistor results in a second set of parasitic capacitances that are substantially opposite the parasitic capacitances of the track and hold transistor. Additionally, depending on the ratios of the various components, the techniques of the two embodiments may be, combined, such that additional diode may be added even if the complementary transistor technique is utilized.

摘要翻译： 提供了一种简单，低成本的电路和方法，用于管线晶体管结的寄生电容，与所采用的工艺技术无关。 在优选实施例中，轨道和保持电路中的晶体管的寄生电容通过在正常跟踪操作期间提供与形成在集成电路内的寄生二极管相反的一对二极管来线性化。 如果没有本发明的二极管，变化的输入信号会引起寄生电容的变化，从而导致轨道和保持电路中的谐波失真。 还提供了本发明的替代实施例，其中提供第二互补晶体管。 包含互补晶体管产生与轨道和保持晶体管的寄生电容基本相反的第二组寄生电容。 另外，根据各种组件的比例，两个实施例的技术可以组合起来使得即使利用互补晶体管技术也可以添加额外的二极管。