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High Linearity and Medium Power Applications Using the Avago's ATF-511P8 PHEMT-App Note

From Avago Technologies
 

 

Avago Technologies ATF-511P8 is an enhancement mode PHEMT designed for high linearity and medium power applications. With an OIP3 of 41.3 dBm and a 1 dB compression point of 26 dBm, the ATF-511P8 is well suited as a base station transmit driver or a second or third stage LNA in a receive chain. Whether the design is for a W-CDMA, CDMA, or GSM base station, this device delivers good linearity in the form of OIP3 or ACPR, which is required for standards with high peak to average ratios.

The ATF-511P8 device operates as a normal FET requiring input and output matching as well as DC biasing. Unlike a depletion mode transistor, this enhancement mode device only requires a single positive power supply, which means a positive voltage is placed on the drain and gate in order for the transistor to turn on. This application note discusses the RF and DC design employed in a single FET amplifier. Included in this description is an active feedback scheme to accomplish this DC biasing.

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