Harmonic suppression in dual band mobile phones
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United States of America Patent
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Jun 4, 2002
Grant Date -
N/A
app pub date -
May 21, 1999
filing date -
May 22, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
To effectively suppress harmonics in a dual band mobile phone with a power amplifier (10) outputting transmitting signals for different frequency bands (GSM; PCS, DCS) via a single output as described a power amplifier output circuit in which harmonics are filtered through impedance transformation of a turn-off impedance of a transmitter/receiver change over unit (36, 38). Hereby the desired filtering of harmonics may be achieved without almost no additional expenditure.
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