Tube Structure Forms Inductive Part Of Resonant Circuit Patents (Class 331/103)
  • Patent number: 7764137
    Abstract: A circuit can include an amplifier having at least a first junction field effect transistor (JFET) of a first conductivity type with a source coupled to a first power supply node, and a drain coupled to an amplifier output node. A first variable bias circuit can be coupled between the drain and at least one gate of the first JFET. The first variable bias circuit can alter a direct current (DC) bias to the first JFET according a potential at the amplifier output node. A first bias impedance can be coupled between the drain of the first JFET and a second power supply node. The circuit can also include a non-linear transmission line (NLTL) coupled between the amplifier output and a gate of the first JFET. The NLTL being configured to propagate an electrical soliton.
    Type: Grant
    Filed: September 21, 2007
    Date of Patent: July 27, 2010
    Assignee: SuVolta, Inc.
    Inventor: Christopher L. Hamlin
  • Patent number: 7555051
    Abstract: A quadrature transmitter and receiver have configurable I and Q channel paths that facilitate the application of selected test signals to determine gain and phase imbalances introduced by the transmitter and receiver. In a first ‘normal’ configuration, the I and Q channels are independently tested by applying an I-only test signal, followed by a Q-only test signal. In a second ‘switched transmitter’ configuration, the Q-only test signal is again applied. In a third ‘switched receiver’ configuration, the I-only test signal is again applied. By combining the results, gain and phase imbalances of the transmitter and the receiver can be determined. In a preferred embodiment, these configurations and test signals are applied within a single transceiver that has the output of its transmitter closed-loop coupled to the input of its receiver.
    Type: Grant
    Filed: May 28, 2004
    Date of Patent: June 30, 2009
    Assignee: NXP B.V.
    Inventor: Yifeng Zhang
  • Publication number: 20080129397
    Abstract: An electrical generator that uses a high frequency oscillator in a tuned circuit, set to resonate with the transmitter coil of a full-length high frequency transformer unit, to generate electromagnetic energy, to transform this energy to electrical energy and to collect this energy.
    Type: Application
    Filed: November 7, 2006
    Publication date: June 5, 2008
    Inventor: Joseph J. Boyd
  • Patent number: 7339440
    Abstract: Methods and apparatus for implementing stable self-starting and self-sustaining electrical nonlinear pulse (e.g., soliton, cnoidal wave, or quasi-soliton) oscillators. In one example, a nonlinear pulse oscillator is implemented as a closed loop structure that comprises a nonlinear transmission line, an improved high-pass filter, and a nonlinear amplifier configured to provide a self-adjusting gain as a function of an average voltage of the oscillator signal, to provide a pulse waveform having a desired target amplitude. In one implementation, the nonlinear amplifier and high pass filter functions are integrated in a two stage nonlinear amplifier/filter apparatus employing complimentary NMOS and PMOS amplification components and associated filtering and feedback circuitry configured to essentially implement an electric circuit analog of a saturable absorber via an adaptive bias control technique.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: March 4, 2008
    Assignee: President and Fellows of Harvard College
    Inventors: David Ricketts, Xiaofeng Li, Donhee Ham
  • Patent number: 5714913
    Abstract: A discrete monotron oscillator for use in a high power microwave device is formed with a microwave oscillator having a half-wavelength resonant coaxial microwave cavity operating in fundamental TEM mode for microwave oscillation with an inner conductor defining a drift tube for propagating an electron beam and an outer conductor coaxial with the inner conductor. The inner conductor defines a modulating gap and an extraction gap downstream of the modulating gap. The modulating gap and the extraction gap connect the coaxial microwave cavity with the drift tube so that energy for the microwave oscillation is extracted from the electron beam at the extraction gap and modulates the electron beam at the modulating gap. For high power operation, an annular electron beam is used.
    Type: Grant
    Filed: December 8, 1995
    Date of Patent: February 3, 1998
    Assignee: The Regents of the University of California
    Inventors: Bruce E. Carlsten, William B. Haynes
  • Patent number: 5649307
    Abstract: An option select scheme (300) and circuit (200) allows a single analog-to-digital (A/D) line (211) to be used between an accessory (204) and a portable radio (202) to control first and second accessory features (234, 236). First and second variable resistive devices (226,228) are used in conjunction with a push-to-talk switch (PTT) (230) to control the first and second accessory features (234, 236). The PTT switch (230) allows the first variable resistive device (226) to present a first voltage range to the A/D line (211) in a first state when the PTT switch (230) is depressed. The PTT switch (230) allows the second variable resistive device (228) along with bias resistor (224) to present a second voltage range to the A/D line (211) in a second state when the PTT switch (230) is not depressed. A third state exists when the accessory (204) is disconnected from the radio (202) and a third voltage range is presented to the A/D line (211).
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: July 15, 1997
    Assignee: Motorola, Inc.
    Inventor: Joseph Patino
  • Patent number: 5483207
    Abstract: High-frequency, low-power CMOS oscillators having electrically-tunable tank circuits are disclosed. Electrically-tunable inductors assure highly efficient oscillator operation and can be adjusted after manufacture to assure high yields of high-precision oscillator circuits.
    Type: Grant
    Filed: December 30, 1994
    Date of Patent: January 9, 1996
    Assignee: AT&T Corp.
    Inventor: Thaddeus J. Gabara