Patents by Inventor Dennis H. Carlson

Dennis H. Carlson 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).

  • Method and apparatus for providing biphase modulation
    Patent number: 5680417
    Abstract: A binary phase shift keyed (BPSK) modulator (200) used for digital phase modulation is shown. Phase shift is achieved by electrically switching an RF input signal (201) through either a direct signal path (203) or through a half wave transmission signal path (205) to shift its phase by 180 degrees. Both the data signal (211) and its complement (213) are used to turn on one of PIN diodes (207, 209) while simultaneously turning off the other diode with reverse bias. This technique allows for obtaining maximum diode isolation. The BPSK modulator (200) has the advantages of very low insertion loss, dc coupling for low frequency modulation components and high performance with minimum parts.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: October 21, 1997
    Assignee: Motorola, Inc.
    Inventor: Dennis H. Carlson