Patents by Inventor Richard Nail

Richard Nail 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).

  • Differential amplifier having extended common mode input voltage range
    Patent number: 4887048
    Abstract: A differential amplifier (10) having a circuit (18) which images or simulates the bias current flowing in an input stage (34) of the differential amplifier (10) is disclosed. This image circuit (18) resembles a differential amplifier input stage, couples to the signal inputs (28, 30) of the differential amplifier (10), and provides an output signal that reflects such bias current. One embodiment of the present invention feeds this output signal back to the differential amplifier input stage (34) to improve regulation of a constant current source (26). Another embodiment uses this signal to switch current from an external source (86) to the differential amplifier input stage (34) when a constant current source (26) within the differential amplifier input stage (34) fails to maintain a constant current supply.
    Type: Grant
    Filed: January 21, 1988
    Date of Patent: December 12, 1989
    Assignee: Texas Instruments Incorporated
    Inventors: William R. Krenik, Wei-chan Hsu, Richard Nail