Front end filter circuitry for a dual band GSM/DCS cellular phone
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United States of America Patent
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Sep 26, 2000
Grant Date -
N/A
app pub date -
Mar 6, 1998
filing date -
Mar 6, 1998
priority date (Note) -
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Abstract
A front end circuit for an RF dual band GSM/DCS phone includes a first channel including an elliptical high-pass filter, a first SAW filter, and a low noise amplifier and a second channel including a second SAW filter and a second low noise amplifier. The output of each channel is alternately switchable to a single-side band mixer circuit. This front end circuit arrangement provides significantly reduced cost and part count over other approaches.
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