WIDEBAND DOHERTY AMPLIFIER CIRCUIT WITH INTEGRATED TRANSFORMER LINE BALUN
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United States of America Patent
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Issued Date -
Oct 20, 2016
app pub date -
Apr 17, 2015
filing date -
Apr 17, 2015
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Abstract
A Doherty amplifier circuit includes an RF input terminal, an RF output terminal, a main amplifier having a first input terminal and a first output driving terminal, and a peaking amplifier having a second input terminal and a second output driving terminal. An output combining network is configured to feed output current from the first and second output driving terminals into a summing node. The output combining network includes a transmission line transformer balun having first and second input ports and a first output port being connected to the summing node, a first electrical connection between the first output driving terminal and the first input port, and a second electrical connection between the second output driving terminal and the second input port. The second electrical connection includes a quarter wave impedance inverter. A first output impedance matching network is connected between the summing node and the RF output terminal.
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