Patents by Inventor John C. Platt

John C. Platt 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).

  • Circuits for linear conversion between voltages and currents
    Patent number: 5126685
    Abstract: A linear voltage-to-current converter (LVCC) circuit includes two transistors, one P-channel and one N-channel. The input voltage is applied to the gates of both transistors. The drains of the two transistors are connected. The source of the p-type transistor is connected to a first voltage rail, and the source of the N-channel is connected to a second voltage rail of lower voltage. The output is the difference between the current through the P-channel transistor and the N-channel transistor. A linear current-to-voltage converter (LCVC) circuit is similar to the LVCC circuit, except that the gates of the transistors are tied to the drains of the transistors. The input current is supplied to the drains, and the output voltage is the voltage of the drains.
    Type: Grant
    Filed: August 19, 1991
    Date of Patent: June 30, 1992
    Assignee: Synaptics, Incorporated
    Inventors: John C. Platt, Michael F. Wall, Glenn E. Gribble, Carver A. Mead
  • Linear, continuous-time, two quadrant multiplier
    Patent number: 5107149
    Abstract: A linear voltage-to-current converter (LVCC) circuit includes two transistors, one P-channel and one N-channel. The input voltage is applied to the gates of both transistors. The drains of the two transistors are connected. The source of the p-type transistor is connected to a first voltage rail, and the source of the N-channel is connected to a second voltage rail of lower voltage. The output is the difference between the current through the P-channel transistor and the N-channel transistor. A linear current-to-voltage converter (LCVC) circuit is similar to the LVCC circuit, except that the gates of the transistors are tied to the drains of the transistors. The input current is supplied to the drains, and the output voltage is the voltage of the drains.
    Type: Grant
    Filed: August 19, 1991
    Date of Patent: April 21, 1992
    Assignee: Synaptics, Inc.
    Inventors: John C. Platt, Michael F. Wall, Glenn E. Gribble, Carver A. Mead