Patents by Inventor Yau Kin Joseph Hon

Yau Kin Joseph Hon 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).

  • Low noise preamplifier
    Patent number: 6054901
    Abstract: A low-noise wide band preamplifier (10) provides an output voltage signal (V.sub.O) corresponding to the variation in resistance of a sensor such as Magneto-resistive (MR) head (4) which is used to read the data stored on a magnetic media. In this preamplifier, a transistor (12) and resistor (13) combination is used to function as a transimpedance amplifier (11) to increase the frequency bandwidth of the preamplifier and reduce the noise. The transimpedance amplifier (11) takes its input from an input transistor (3) coupled between the MR head (4) and a current source (2). A biasing circuit formed by a transconductance amplifier (12) and a capacitor (5) is used to control the input transistor (3) so that the average current passing through the input transistor (3) matches the current provided by the current source (2).
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: April 25, 2000
    Assignee: Motorola, Inc.
    Inventors: Elangovan Nainar, Yau Kin Joseph Hon, Gerald Lunn