Having Complementary Symmetry Patents (Class 330/263)
And field effect transistor (Class 330/264)
And feedback means (Class 330/265)
And temperature compensation (Class 330/266)
And particular biasing arrangement (Class 330/267)
  • Amplifying circuit
    Patent number: 4097815
    Abstract: An amplifier circuit suitable for use as a video amplifier in a color television circuit for driving the variable impedance load provided by a color television picture tube, in which the load impedance of the amplifier element of the circuit is also made variable. This is achieved, in one embodiment by using as the output stage of the amplifier two transistors with a complementary symmetrical configuration so that one is always substantially cut-off while the other conducts. In another embodiment a transistor in common collector configuration acts as the amplifier element and its emitter from which the output of the amplifier is taken is connected by a diode to the collector of a transistor which feeds the base of the common collector transistor.
    Type: Grant
    Filed: March 29, 1976
    Date of Patent: June 27, 1978
    Assignee: Indesit Industria Elettrodomestici Italiana S.p.A.
    Inventor: Armando Campioni
  • Power amplifier devices
    Patent number: 4087759
    Abstract: A power amplifier device comprises a power amplifier including an output transistor and voltage is applied to the output transistor from a source through a switching type stabilized source device. The source device produces a reference voltage equal to the sum of the output voltage of the amplifier and a constant voltage required to be impressed across the collector and emitter electrodes of the output transistor.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: May 2, 1978
    Assignee: Nippon Gakki Seizo Kabushiki Kaisha
    Inventor: Masayuki Iwamatsu
  • Audio power amplifier
    Patent number: 4087761
    Abstract: An audio power amplifier can be operated in either class A, class B or class AB amplifier modes by selectively switching bias values set in a bias setting circuitry provided for a driver stage which drives the main power amplifier stage.
    Type: Grant
    Filed: June 24, 1976
    Date of Patent: May 2, 1978
    Assignee: Nippon Gakki Seizo Kabushiki Kaisha
    Inventors: Nobuo Fukumoto, Mitsugo Ohiwa, Teruyoshi Matsui, Hajime Ohta
  • Amplifier circuit
    Patent number: 4072907
    Abstract: An amplifier circuit comprising a differential circuit including means for preventing base bias voltages applied to driver transistors connected with the transistors constituting the differential amplifier from becoming unbalanced. Means is also provided which is adapted to prevent so-called shock noise from appearing at the output of the amplifier circuit. Such means may be constructed by using a delay circuit.
    Type: Grant
    Filed: November 11, 1976
    Date of Patent: February 7, 1978
    Assignee: Shin-Shirasuna Electric Corp.
    Inventors: Mamoru Sekiya, Nobuyuki Sakabe
  • Amplifier with modulated power supply voltage
    Patent number: 4054843
    Abstract: The power supply voltage of an amplifier is modulated by a signal having a waveform that corresponds, at least in selective parts, to the waveform of the signal being amplified by the amplifier.
    Type: Grant
    Filed: April 14, 1976
    Date of Patent: October 18, 1977
    Assignee: Sony Corporation
    Inventor: Osamu Hamada