Patents by Inventor Ding-Jeng Liu

Ding-Jeng Liu 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).

  • Current cell of a digital-to-analog converter
    Patent number: 5801653
    Abstract: A current cell for converting a digital signal to an analog current signal is disclosed. The current cell includes a first PMOS transistor which receives the digital signal from a pre-stage processor by the gate. A drain of the first PMOS transistor is grounded. A second PMOS transistor has a source which is connected to the source of the first PMOS transistor, a gate which receives an inverse signal of the digital signal from the pre-stage processor, and a drain for providing the analog current signal. A third PMOS transistor is connected between a voltage source and the source of the first PMOS transistor. The third PMOS transistor has a gate to which a first reference voltage is applied.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: September 1, 1998
    Assignee: United Microelectronics Corporation
    Inventors: Ding-Jeng Liu, Ying-Tzung Wang, Wen-Hsin Cheng