Grid To Cathode Coupled Or Connected Resonant Circuit Patents (Class 331/171)
  • Patent number: 5113157
    Abstract: A high-frequency electron tube power oscillator includes a multi-grid electron tube (1) in which the output power is adjusted by means of an adjustable impedance element (5) connected in series with the cathode line of the tetrode (1). In order to reduce the dissipated power in the adjustable impedance element (5), the voltage across the impedance element is connected to the screen grid of the tetrode (1) through an amplifier (6) constituted by a triode (9) and a current source (10).
    Type: Grant
    Filed: April 29, 1991
    Date of Patent: May 12, 1992
    Assignee: U.S. Philips Corporation
    Inventors: Christian S. A. E. Patron, Eugene J. Sowinski
  • Patent number: 4012701
    Abstract: A Hartley oscillator includes a basic Hartley oscillation circuit having a semiconductor active element, a tank circuit coupled to the active element and having a grounded end, a coupling capacitor connected between the other end of the tank circuit and a control electrode of the active element. A constant direct current source for supplying a constant direct current to an electric current supply terminal of the active element is further provided. A feedback circuit is coupled to the active element and the output of the constant direct current source and adapted to cause a variation of a direct current potential on the current supply terminal of the active element to be fed back to the control electrode of the active element, and a capacitor having a grounded end and the other end connected to the output of the constant current source is further provided in the Hartley oscillator.
    Type: Grant
    Filed: March 2, 1976
    Date of Patent: March 15, 1977
    Assignee: Tokyo Shibaura Electric Co., Ltd.
    Inventors: Takashi Sugimoto, Kazumasa Noyori