Voltage controlled attenuator for multi-band and multi-mode transmitter and method thereof
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United States of America Patent
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Nov 2, 2004
Grant Date -
Mar 20, 2003
app pub date -
Sep 19, 2001
filing date -
Sep 19, 2001
priority date (Note) -
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Abstract
The present invention describes a voltage controlled attenuator (VCA) to control an output power level of a radio frequency (RF) signal and to direct the RF signal to an appropriate path for a multi-mode and multi-band radiotelephone without using an external switch and without using multiple common VCAs. The present invention comprises a single differential amplifier and a plurality of steering blocks with each of steering blocks having a path dedicated to a specific RF band and a specific RF mode, having a pair of steering lines to control the RF signal level by having a differential voltage applied, and being capable of being disabled by having its steering lines grounded.
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