Patents by Inventor Esa Juhani Rantanen

Esa Juhani Rantanen 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).

  • DAC gain compensation for temperature and process variations
    Patent number: 6377197
    Abstract: A compensation circuit and method cancels transmit digital-to-analog (DAC) gain variations in a wireless communication device. A transmit DAC produces an output current signal Iload load proportional to a reference current Iref which is inversely proportional to a load resistance Rload whereby the DAC output current signal Iload inversely tracks changes in the load resistance due to manufacturing process and temperature to cancel gain variations. The load resistor Rload and reference resistor Rref are preferably located on the same IC and made of the same material. The transmit DAC includes a current steering cell which receives the reference current Iref to produce the output current signal Iload in proportion of the reference current Iref.
    Type: Grant
    Filed: August 15, 2000
    Date of Patent: April 23, 2002
    Assignee: Nokia Mobile Phones Ltd.
    Inventor: Esa Juhani Rantanen