High frequency power amplification electric part and wireless communication system
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United States of America Patent
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Jun 20, 2006
Grant Date -
Jul 15, 2004
app pub date -
Oct 10, 2003
filing date -
Oct 18, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a high frequency power amplification circuit capable of preventing an output power and current consumption from being largely changed even when a load fluctuates in a wireless communication system for detecting an output level necessary for feedback control by a current detecting method. In a high frequency power amplification circuit as a component of a wireless communication system which detects an output level necessary for feedback control by a current detecting method, a capacitive element is interposed between the drain terminal of a power amplification transistor in the final stage and the gate terminal of a transistor constructing a current mirror circuit in a circuit for detecting an output level, and a change in an output power accompanying load fluctuation is reflected in a detection current of the output level detecting circuit.
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