Patents by Inventor Alex W. Hietala

Alex W. Hietala 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).

  • Switching current mirror for a phase locked loop frequency synthesizer and communication device using same
    Patent number: 5722052
    Abstract: A communication device (100) employs a local oscillator (104) having an improved charge pump circuit (122). The charge pump circuit (122) has current mirrors (204, 208) in which a first transistor (224, 270) is biased to provide a substantially constant current. A resistor (226, 272) selectively conducts a reference current to bias a mirror transistor (228, 274). The current mirror (204, 208) provides improved dynamic performance thereby reducing global phase error of the communication device (100).
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: February 24, 1998
    Assignee: Motorola, Inc.
    Inventors: Behrooz L. Abdi, David M. Gonzalez, Alex W. Hietala