Patents by Inventor Ernst L. Lingstaedt

Ernst L. Lingstaedt 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).

  • Patent number: 4570131
    Abstract: A PLL circuit arrangement comprising a voltage controlled oscillator, the frequency of which is determined by the alternating charging and discharging of a capacitor, and a phase comparator, to a first input of which the output signal of the voltage controlled oscillator is supplied and to a second input of which a reference signal is supplied and from the output signal of which the signal controlling the oscillator is derived, wherein the capacitor can be charged by means of a current source circuit having a current intensity which can be switched over, the current intensity of the current source circuit can be switched over to a different value during each charging process, and wherein the moment of switching over of the current source circuit can be changed as a function of the output signal of the phase comparator.
    Type: Grant
    Filed: December 7, 1983
    Date of Patent: February 11, 1986
    Assignee: SGS-ATES Deutschland Halbleiter Bauelemente GmbH
    Inventor: Ernst L. Lingstaedt