Abstract
In this paper a design of a 700W wideband inverted Doherty power amplifier (DPA) together with the LDMOS RF power transistor to cover B71/B12 band is presented. The transistor incorporates internal Video-Bandwidth enhancement technique that improves the linearizability and wideband ruggedness of the PA. The DPA is optimized to achieve high-efficiency/linearity over 20% fractional bandwidth delivering maximum power above 700W. This trade-off between bandwidth and drain efficiency ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\eta$</tex> ) is achieved by proper impedance transformation between the combiner, transistor and output load. Under 1cWCDMA signal with 9.9dB Peak to Average Power Ratio, the measured <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\eta$</tex> of DPA at 6dB output back-off is flat 56 – 58 % over the whole bandwidth. This competes with a narrow-band design, making this DPA a preferred PA for multi-band purposes. A flat gain of 18dB with 0.4dB ripple is achieved. The DPA can deliver maximum saturated <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\eta$</tex> above 70%. The linearity measurements show the ACLR after DPD is around −60dBc. The average gain is 18dB.
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