Pulse or digital communications – Transmitters
Reexamination Certificate
2006-06-20
2006-06-20
Burd, Kevin (Department: 2631)
Pulse or digital communications
Transmitters
C375S298000, C375S308000
Reexamination Certificate
active
07065153
ABSTRACT:
In a system for modulating an RF carrier, the RF carrier is fed through a lowpass filter and phase shifted approximately −90 degrees. The RF carrier is also fed through a high pass filter and phase shifted approximately +90 degrees. A switch connected to the output of the lowpass filter and connected to the output of the highpass filter, selects and outputs either the −90 degree phase shifted carrier output from the lowpass filter or the +90 degree phase shifted carrier output from the highpass filter depending on a switching state determined by data bit information received at a data port to produce a BPSK modulated RF carrier. Two such BPSK modulators may be combined using lowpass and highpass filters to form a QPSK modulator. Two such QPSK modulators may be combined with an attenuator to form a QAM modulator.
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Bach Susan E.
Hiramoto Remy O.
Koyama Daniel H.
Kubasek Suzanne E.
Loheit Kurt W.
Burd Kevin
Shimokaji & Associates P.C.
The Boeing Company
Torres Juan Alberto
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