Coupling To Or From Cathode In Push-pull Patents (Class 330/119)
  • Patent number: 8446228
    Abstract: An oscillator circuit comprises a push-push oscillator and a differential output, comprising a first and a second output circuit. The push-push oscillator has a first and a second branch. Each of the first and second branch comprises an own voltage divider branch of a common bridge circuit. Each of the first and second voltage divider branches comprises an own pair of micro-strip lines connected in series. Each of the first and second voltage divider branches has an own tap. Both taps are connected to each other by at least one of a first capacity and a micro-strip line. The differential output comprises a first and a second output terminal. The first output terminal is connected via the first output circuit to a first node. The second output terminal is connected via the second output circuit to a second node. Each of the first and second nodes of the push-push oscillator is a common node of both of the first and the second branches.
    Type: Grant
    Filed: January 5, 2009
    Date of Patent: May 21, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventor: Saverio Trotta
  • Patent number: 8022776
    Abstract: The present disclosure relates to coupled circuits and methods of coupling circuits having a power supply wherein a plurality of transistors are inductively coupled directly to the power supply for providing a single DC supply voltage directly to each of the plurality of transistors, and wherein a plurality of transformers have primary and secondary windings, the primary and secondary windings providing, at least in part, inductive loads for inductively coupling the plurality of transistors to the power supply, the plurality of transformers also providing an AC signal path for coupling neighboring ones of the plurality of transistors together.
    Type: Grant
    Filed: August 2, 2006
    Date of Patent: September 20, 2011
    Assignee: The Regents of the University of California
    Inventors: Mau-Chung Frank Chang, Daquan Huang, Tim Richard LaRocca
  • Patent number: 7173488
    Abstract: A vacuum tube power amplifier with a user-operable switch and a single output transformer which selectively provides push-pull or single ended configurations for driving a loudspeaker.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: February 6, 2007
    Assignee: Mesa Boogie
    Inventor: Randall C. Smith
  • Patent number: 6937093
    Abstract: An amplifier is described including a pair of cathode-coupled pentode vacuum tubes. A first pentode of the pair includes a control grid configured to receive an input signal. A second pentode of the pair includes a control grid configured to be coupled to an input reference signal. A cascaded voltage regulator includes a first stage configured to generate a plate reference voltage for providing voltage to a plate of each pentode. The regulator includes a second stage configured to generate a screen reference voltage based on the plate reference voltage for providing voltage to a screen grid of each pentode. The amplifier can also include a push-pull output stage having a servo circuit configured to adjust the control bias signal for one of a pair of vacuum tubes included in the stage until the plate currents in the pair of tubes are substantially equal.
    Type: Grant
    Filed: January 7, 2004
    Date of Patent: August 30, 2005
    Assignee: Bretza, Ltd.
    Inventor: Terence D. Tekushan
  • Publication number: 20040140850
    Abstract: An amplifier is described including a pair of cathode-coupled pentode vacuum tubes. A first pentode of the pair includes a control grid configured to receive an input signal. A second pentode of the pair includes a control grid configured to be coupled to an input reference signal. A cascaded voltage regulator includes a first stage configured to generate a plate reference voltage for providing voltage to a plate of each pentode. The regulator includes a second stage configured to generate a screen reference voltage based on the plate reference voltage for providing voltage to a screen grid of each pentode. The amplifier can also include a push-pull output stage having a servo circuit configured to adjust the control bias signal for one of a pair of vacuum tubes included in the stage until the plate currents in the pair of tubes are substantially equal.
    Type: Application
    Filed: January 7, 2004
    Publication date: July 22, 2004
    Applicant: Bretza, Ltd.
    Inventor: Terence D. Tekushan
  • Patent number: 6507240
    Abstract: A musical amplifier that includes a vacuum tube and a transistor. The vacuum tube is connected to the gate of the transistor, so that the current flow through the transistor is controlled by the vacuum tube. According to one example of the invention, the vacuum tube-transistor arrangement is set up in a “push-pull” arrangement, where a vacuum tube-transistor combination controls positive voltages, and another vacuum tube-transistor combination controls the negative voltages delivered by the system, the system output being at approximately zero voltage when not under load. Also, the use of the “Edison effect,” referred to as “thermionic emission” from vacuum tubes to variably regulate output transistor bias current resulting in substantially reduced total harmonic distortion is also disclosed.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: January 14, 2003
    Inventor: Brent K. Butler
  • Patent number: 6265938
    Abstract: A novel drive stage provides with low distortion a large amplitude signal, such as required for driving a cathode-follower output stage of a power amplifier. The drive stage comprises an amplification substage and a load substage. Each substage comprises two series connected vacuum tubes. Each substage is provided with a respective voltage divider network to provide that the two tubes of each substage share approximately equally both the quiescent static voltage and the dynamic voltage of the substage. The load substage coacts with the amplification substage to provide a novel mu-follower or SRPP circuit having approximately twice the voltage swing of a conventional circuit. This approximately quadruples the maximum power output of the cathode-follower amplifier.
    Type: Grant
    Filed: December 27, 1999
    Date of Patent: July 24, 2001
    Inventor: Martin Reiffin
  • Patent number: 5859565
    Abstract: A cathode-follower power output stage is driven by a novel drive stage to provide with low distortion the large signal required to drive the output stage. The drive stage comprises two series connected vacuum tubes which share the large static and dynamic voltages of the drive stage so as to provide a drive signal having a large voltage swing, without generating audible distortion and without subjecting the drive stage tubes to excessively high voltages. The plate of a first drive tube is connected to the cathode of the second drive tube. A load impedance is connected from a B+ power supply terminal to the plate of the second drive tube. The grid of the second drive tube is driven by a signal responsive voltage divider network driven by the plate of the second drive tube.
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: January 12, 1999
    Inventor: Martin Reiffin