Patents by Inventor Stephen F. Bily

Stephen F. Bily 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).

  • Patent number: 6380805
    Abstract: In accordance with the present invention complementary P-channel and N-channel input pairs of transistors form in an op amp. Two sets of such pairs are provided so that a transconductance range of each set of pairs is different. By combining the outputs of each of the sets of P-channel and N-channel pairs, a transconductance glitch is reduced in half.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: April 30, 2002
    Assignee: Cirrus Logic, Inc.
    Inventors: Stephen F. Bily, Lei Wang
  • Patent number: 5585763
    Abstract: An amplifier with controlled output impedance utilizing current and voltage feedback to set gain and output impedance is disclosed. The voltage feedback is provided by feedback resistor connected from the output to the inverting input. The current feedback is provided by feeding a current proportional to the output current directly to the inverting input of the amplifier. An error amplifier is used to maintain the proper ratio of the current feedback to the output current and to cancel the effects of the output device impedance on the overall output impedance. Two such amplifiers driven by complimentary signals form a differential amplifier with controlled output impedance. Because the output impedance is a function of the voltage feedback resistance and the current feedback ratio, it is possible to digitally control the output impedance by changing the feedback resistance and/or the current feedback ratio.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: December 17, 1996
    Assignee: Crystal Semiconductor Corporation
    Inventors: Mohammad J. Navabi, Baker P.L. Scott, III, Stephen F. Bily
  • Patent number: 4988954
    Abstract: A linear power amplifier having differential push-pull outputs, in which each output consists of an upper and a lower output transistor, includes cross-coupling transistors coupled between the gate of each of the output transistors and a reference voltage such that when the cross-coupled transistor is made conductive, it acts to turn off its associated output transistor. Each of the cross-coupled transistors is controlled by the voltage at the gate of the corresponding output transistor at the other of the differential outputs. Thus, the cross-coupling transistors insure that only one of the upper output transistors is on at one time and only one of the lower output transistors is on at any one time. These cross-coupling transistors operate in conjection with output stage shutoff circuitry to control the current wasted in the output stages of the linear power amplifier by ensuring that the output transistors at each output are not both conducting a significant amount of current at any one time.
    Type: Grant
    Filed: April 28, 1989
    Date of Patent: January 29, 1991
    Assignee: Crystal Semiconductor Corporation
    Inventors: Kenneth J. Stern, Stephen F. Bily