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ARTICLES

Improved Gain for a Dynamic Envelope Tracking Amplifier in Cellular Radio Handsets

Use of varactor diode to improve gain in an envelope tracking amplifier in third generation cellular phones
August 1, 2001
TECHNICAL FEATURE Improved Gain for a Dynamic Envelope Tracking Amplifier in Cellular Radio Handsets An envelope tracking (ET) amplifier with variable bias voltage is a potentially more efficient power amplifier technique for third generation cellular phones. However, the input and output impedances of the transistors vary with the bias...
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