Patents by Inventor Carl Walter Pobanz

Carl Walter Pobanz 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).

  • High-speed electro-optical modulator drivers and method
    Patent number: 6836185
    Abstract: A modulator driver design is disclosed that employs a differential pair amplifier coupled to feedback amplifiers through tuning networks. Each tuning network comprises a set of inductors that enables a broadband response while reducing the loading effect of the feedback amplifier. An active load is placed at the output to serve multiple purposes, including: generating a high output swing, enabling a lower power supply voltage, and allowing the entire bias circuit to be monolithically integrated.
    Type: Grant
    Filed: May 17, 2002
    Date of Patent: December 28, 2004
    Assignee: Inphi Corp.
    Inventor: Carl Walter Pobanz
  • FET active load and current source
    Patent number: 6664842
    Abstract: The present invention is a circuit comprising two series-coupled field effect transistor (FET) devices with a resistor network coupled in parallel forming a composite device (that can be substituted directly for a single FET device). In applications such as active loads or current sources, the composite device exhibits a greater breakdown voltage and superior high-frequency characteristics. The resistor network provides optimum direct current (DC) bias for depletion mode devices and superior high-frequency loading. Bandwidth and stability are both increased. Furthermore, this circuit is compatible with depletion mode FET processes having a single fixed threshold voltage.
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: December 16, 2003
    Assignee: Inphi Corporation
    Inventor: Carl Walter Pobanz