Radio communication apparatus with expanded dynamic range
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United States of America Patent
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Nov 18, 1997
Grant Date -
N/A
app pub date -
Aug 17, 1994
filing date -
Aug 20, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Part of a first signal path for amplifying a signal includes circuits for detecting a signal, and a second signal path connected to an input portion of the first signal path includes circuits for detecting the signal. A signal strength detector circuit adds outputs from the respective detector circuits in the first and second signal paths. The first signal path has a function of expanding the dynamic range in a smaller signal region as compared with the second signal path, while the second signal path has a function of expanding the dynamic range in a larger signal region as compared with the first signal path. When a radio transmitted output is variably controlled in a radio transmitter section based on a field strength detection output for a received signal, the transmitted output is optimized, resulting in minimizing consumed power and unnecessary radiation of radio waves.
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