Modulation for amplitude-modulating a signal
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United States of America Patent
Stats
-
Apr 10, 2012
Grant Date -
Mar 4, 2010
app pub date -
Apr 19, 2007
filing date -
Apr 21, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Modulators for amplitude-modulating signals defined by phase information and envelope codes are provided with first transistors for receiving the phase information and second transistors for receiving the envelope codes. The first main electrode of one transistor is coupled to the second main electrode of the other transistor and the other second main electrode constitutes an output of the modulator. This modulator can be used in any kind of transistor environment and is simple and low cost. The doped areas of the coupled first and second main electrodes comprise an overlap to reduce cross-talk and to reduce silicon area. Polar transmitters are provided with this modulator and with a circuit for generating a phase/frequency code and the envelope code and with an oscillator for receiving the phase/frequency code and for generating the phase information. A phase shift between the phase information and the envelope code reduce aliases.
First Claim
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