Patents by Inventor John C. Pavlic

John C. Pavlic 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: 6580319
    Abstract: In a transfer linearization (TL) circuit one or more biased nonlinear elements form a nonlinear attenuator and a biased network to allow adjustment of diodes to linearize the overall transfer of the TL circuit and an amplifier being linearized. The transfer linearization circuit reduces distortion encountered in a broadband RF amplifier. The circuit compensates for attenuation of amplified broadband signals in CATV systems. The transfer linearization circuit provides low insertion loss and requires very low power consumption. Nearly constant impedance and constant insertion loss is provided across a wide frequency range and reduces both in-band and out-of-band third order distortions. The TL circuit exhibits instantaneous amplitude and phase transfer correction. No tuned frequency selective components are required so that adjustments are relatively straightforward.
    Type: Grant
    Filed: April 19, 2001
    Date of Patent: June 17, 2003
    Assignee: Corp.
    Inventors: Derald O. Cummings, John C. Pavlic, Robert C. Ritter
  • Patent number: 5130664
    Abstract: An apparatus for and a method of RF amplification of signals up to 1 GHz. The apparatus, known as a repeater station, is for use in Community Antenna TeleVision transmission (CATV). The RF amplification (gain) stage includes two multitransistor distributed amplifier stages connected in a push-pull configuration. Each distributed amplifier includes four transistors connected to produce two-each cascode circuits. The distributed amplifier stages are operated in push-pull configuration by means of a phase shifting power splitter. The push-pull configuration of the distributed amplifier operates in combination with the phase shifting power splitter to cancel the 2IM distortion created within the distributed amplifiers, and to double the output capability of a single distributed amplifier.
    Type: Grant
    Filed: March 7, 1991
    Date of Patent: July 14, 1992
    Assignee: C-COR Electronics, Inc.
    Inventors: John C. Pavlic, Donald A. Heaton, Samuel H. Stitzer
  • Patent number: 4517521
    Abstract: An improved feed forward circuit and a method of aligning and balancing the improved feed forward circuit. The feed forward circuit includes a first circuit loop to isolate signal noise and distortion and a second circuit loop to reduce signal noise and distortion. The first circuit loop and the second circuit loop have directional coupler means, amplification means, and delay means. The first circuit loop and the second circuit loop are interconnected through a pair of common directional coupler means having common balance circuitry connected therebetween. The first circuit loop has a signal input terminal and an input test terminal and the second circuit loop has a signal output terminal and an output test terminal. The improvement in the feed forward circuit includes a pair of additional directional coupler means.
    Type: Grant
    Filed: February 28, 1984
    Date of Patent: May 14, 1985
    Assignee: C-COR Electronics, Inc.
    Inventors: Joseph P. Preschutti, John C. Pavlic
  • Patent number: 4394631
    Abstract: A broadband radio frequency signal are in the range between about 5 and 400 MHz and a single phase 60 Hz AC power signal are transmitted through a cable transmission line of a cable television system. Amplifiers are powered by the 60 Hz AC signal. The amplifiers are operable as repeater stations that transmit the radio frequency (RF) signal. An RF choke connected to the transmission line separates the 60 Hz AC signal from the broadband 5 to 400 MHz signal. The RF choke includes a conductor of a preselected gauge formed in a coil having a preselected number of turns wound around a ferrite coil form. A ferrite bead is in series with the coil on a selected turn of the coil. The ferrite bead displays an RF series resistance or impedance to the inductance of the coil and reduces the series resonance of the coil. A resistor is connected in parallel to a selected turn of the coil at the opposite end of the coil and functions as a shunt.
    Type: Grant
    Filed: May 29, 1981
    Date of Patent: July 19, 1983
    Assignee: C-Cor Electronics, Inc.
    Inventor: John C. Pavlic