Patents by Inventor Ivan Dimitrov Avramov

Ivan Dimitrov Avramov 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).

  • Phase-shift oscillator having ladder-type saw filter feedback circuit
    Patent number: 5874866
    Abstract: An oscillation circuit of phase-shift type includes a surface acoustic wave filter in a feedback circuit, the surface acoustic wave filter having first and second one-port surface acoustic wave resonators of different resonance frequencies connected in a ladder configuration. The oscillation circuit has a high C/N ratio with a large bandwidth of variable frequency and can be fabricated in a small size with low costs.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: February 23, 1999
    Assignees: Fujitsu Limited, Fujitsu Towa Electron Limited
    Inventors: Yoshio Satoh, Osamu Ikata, Takashi Matsuda, Yoshitaka Takahashi, Ivan Dimitrov Avramov