Patents by Inventor Thinh Dat Do

Thinh Dat Do 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).

  • Switch assembly with a multi-pole switch for combining amplified RF signals to a single RF signal
    Patent number: 6587014
    Abstract: A switch assembly has a housing and a plurality of controllable switches. The housing has a plurality of input ports and an output port and the plurality of individually controllable switches is arranged within the housing. Each switch has an open position and a closed position and is coupled to one of a plurality of input ports of the housing and a common summing junction within the housing. Each input port receives a coherent radio frequency (RF) signal. The output port is coupled to the common summing junction and outputs a sum signal that includes at least one of the RF signals received at the common summing junction when a switch is in the closed position. The switch assembly may further include impedance matching lines that transform a reference impedance value to a higher value prior to switching and an impedance transformation line that provides for the reference impedance value at a distal end of the impedance transformation line.
    Type: Grant
    Filed: January 25, 2001
    Date of Patent: July 1, 2003
    Assignee: Paradigm Wireless Communications LLC
    Inventors: Thinh Dat Do, Thuan Nam Tran, Charles R. Gentzler
  • Method and apparatus for optimum biasing of cascaded MOSFET radio-frequency devices
    Patent number: 6522197
    Abstract: Generally, the invention relates to a method and apparatus to improve the performance of multi-stage radio frequency linear power amplifiers. More particularly, the present invention discloses a cascaded gain expansion stage and gain compression stage at differing bias levels to produce an amplifier with superior linearity and lower intermodulation distortion and adjacent channel power than any single stage by alone.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: February 18, 2003
    Assignee: Paradigm Wireless Systems, Inc.
    Inventors: Ki Y. Nam, Thinh Dat Do
  • Method and apparatus for optimum biasing of cascaded mosfet radio-frequency devices
    Publication number: 20020005755
    Abstract: Generally, the invention relates to a method and apparatus to improve the performance of multi-stage radio frequency linear power amplifiers. More particularly, the present invention discloses a cascaded gain expansion stage and gain compression stage at differing bias levels to produce an amplifier with superior linearity and lower intermodulation distortion and adjacent channel power than any single stage by alone.
    Type: Application
    Filed: December 21, 2000
    Publication date: January 17, 2002
    Inventors: Ki Y. Nam, Thinh Dat Do
  • Switch assembly with a multi-pole switch for combining amplified RF signals to a single RF signal
    Publication number: 20010040485
    Abstract: A switch assembly has a housing and a plurality of controllable switches. The housing has a plurality of input ports and an output port and the plurality of individually controllable switches is arranged within the housing. Each switch has an open position and a closed position and is coupled to one of a plurality of input ports of the housing and a common summing junction within the housing. Each input port receives a coherent radio frequency (RF) signal. The output port is coupled to the common summing junction and outputs a sum signal that includes at least one of the RF signals received at the common summing junction when a switch is in the closed position. The switch assembly may further include impedance matching lines that transform a reference impedance value to a higher value prior to switching and an impedance transformation line that provides for the reference impedance value at a distal end of the impedance transformation line.
    Type: Application
    Filed: January 25, 2001
    Publication date: November 15, 2001
    Inventors: Thinh Dat Do, Thuan Nam Tran, Charles R. Gentzler