Patents by Inventor H.ang.kan Enstrom

H.ang.kan Enstrom 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).

  • Crystal oscillator with AGC and on-chip tuning
    Patent number: 6052036
    Abstract: A highly stable single chip crystal controlled oscillator with automatic gain control. An amplitude detector monitors the output of a crystal controlled oscillator amplifier and produces a feedback signal proportional to the output signal of the amplifier to ensure oscillation is induced at startup and that the amplitude of oscillation is limited to a preselected value during operation to conserve power consumption by the amplifier. The capacitor tank circuit connected to the input of the amplifier includes a voltage variable capacitor the voltage across which is initially established at manufacture to tune the oscillation frequency to a preselected value. The voltage across the voltage variable capacitor is also adjusted to compensate for temperature variations in the circuit.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: April 18, 2000
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventors: H.ang.kan Enstrom, Erik Bengtsson, Torbjorn Gardenfors