Patents by Inventor Brian V. Cake

Brian V. Cake 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: 5621408
    Abstract: A delta sigma converter according to the present invention replaces the quantizer of a conventional delta sigma converter, such as a comparator followed by a latch, with N quantizers, each operating at a reduced frequency f.sub.s /N and phase offset from each other by 2.pi./N. The quantized outputs are assembled in accordance with a control signal to produce a feedback signal at a frequency f.sub.s and the feedback signal is applied to a subtractor of the delta sigma converter.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: April 15, 1997
    Assignee: LeCroy Corporation
    Inventors: Brian V. Cake, Jean-Francois Goumaz, Walter O. LeCroy
  • Patent number: 5293122
    Abstract: A signal probe apparatus having a probe tip, a grounding attachment, a main body portion and a connector for use with a signal measuring device. The probe tip and the grounding attachment are coupled by way of first and second signal lines to the connector for supplying signals therefrom to the signal measuring device. A plurality of circuit elements, such as resistors, are connected between the second signal line and a third line in the connector; and switch means located on the main body portion enables a predetermined circuit value, for example, the resistance between the second and third lines, to be selectively changed to a respective value which corresponds to a respective one of several predetermined functions which may be performed by the signal measuring device. The selected circuit value is detected by the signal measuring device and the corresponding function is thereafter implemented.
    Type: Grant
    Filed: June 8, 1992
    Date of Patent: March 8, 1994
    Assignee: LeCroy Corporation
    Inventors: Brian V. Cake, Stephen T. Dye
  • Patent number: 5218363
    Abstract: Current switching apparatus including at least one current switching tree comprised of cascaded sets of switching circuits, with an input set operable with sampling clock pulses supplied at a fixed frequency and the remaining cascaded sets operable at different frequencies, and further including a sample skipping circuit interconnected between successive sets for reducing the effective sampling frequency of the switching tree while maintaining the fixed frequency at which the input set operates. The sample skipping circuit includes a dump circuit selectively energized to dump selected samples produced by the input set. When the apparatus is formed of plural switching trees of different phases, a sampling clock generator having an adjustable delay circuit is used to delay sampling clock pulses by adjustable amounts so as to establish predetermined phases of sampling clock pulses of the same frequency and different phases for use in each switching tree.
    Type: Grant
    Filed: September 16, 1991
    Date of Patent: June 8, 1993
    Assignee: LeCroy Corporation
    Inventors: Walter O. LeCroy, Jr., Brian V. Cake
  • Patent number: 4804939
    Abstract: Analog-to-digital conversion in which a coarse digital representation of an input analog signal is converted to a coarse analog representation, and the difference between the original analog signal and the coarse analog representation is determined. A ramp waveform signal is generated, and a change in that waveform by an amount substantially equal to the difference between the original analog signal and the coarse analog representation is sensed. A plural bit fine digital signal corresponding to the sensed change of the ramp waveform is produced. The combination of the coarse and fine digital signals constitute the digital representation of the input analog signal. In one embodiment, the ramp waveform is increased until it is equal to the difference between the analog signal and the coarse analog representation, whereupon the ramp waveform is digitized.
    Type: Grant
    Filed: August 25, 1987
    Date of Patent: February 14, 1989
    Assignee: LeCroy Corporation
    Inventors: Brian V. Cake, Frederick W. Sippach
  • Patent number: 4734677
    Abstract: Analog-to-digital conversion in which a coarse digital representation of an input analog signal is converted to a coarse analog representation, and the difference between the original analog signal and the coarse analog representation is determined. A ramp waveform signal is generated, and a change in that waveform by an amount substantially equal to the difference between the original analog signal and the coarse analog representation is sensed. A plural bit fine digital signal corresponding to the sensed change of the ramp waveform is produced. The combination of the coarse and fine digital signals constitute the digital representation of the input analog signal. In one embodiment, the ramp waveform is increased until it is equal to the difference between the analog signal and the coarse analog representation, whereupon the ramp waveform is digitized.
    Type: Grant
    Filed: August 28, 1986
    Date of Patent: March 29, 1988
    Assignee: LeCroy Research Systems Corporation
    Inventors: Brian V. Cake, Frederick W. Sippach