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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
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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