Patents by Inventor Shu-Ing Ju

Shu-Ing Ju has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5336946
    Abstract: A differential output stage utilizes four unity-gain differential amplifiers to receive a pair of input signals and to generate a differential signal. The non-inverting inputs of two of the differential amplifiers are connected together to receive one of the input signals while the outputs of the two differential amplifiers are connected to a forward node and to the inverting inputs of the two differential amplifiers. The non-inverting inputs of the remaining two differential amplifiers are connected together to receive the remaining input signals while the outputs of the remaining two differential amplifiers are connected to a reverse node and to the inverting inputs of the remaining two differential amplifiers.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: August 9, 1994
    Assignee: National Semiconductor Corporation
    Inventors: Para K. Segaram, Shu-Ing Ju
  • Patent number: 5121284
    Abstract: A drive circuit suitable for driving an inductive load such as an isolation transformer is disclosed having a driver stage and associated feedback circuitry. The driver stage has at least one output for connecting to the load and is switchable between a drive mode and an idle mode of operation. In the drive mode of operation, the driver stage produces a data output signal at the output which corresponds to a data input signal received by the driver stage. In the idle mode, the driver stage produces an idle signal, in response to a control signal, which functions to discharge the conductive load. The feedback circuit produces the control signal in response to the idle signal and adjusts the control signal so that the idle output signal will approach a predetermined neutral level. The inductor will proceed to discharge and, once discharged, will shift the idle voltage.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: June 9, 1992
    Assignee: National Semiconductor Corporation
    Inventors: Keith K. Onodera, Shu-ing Ju