Abstract
In this paper, a broadband high efficiency power amplifier (PA) is demonstrated in gallium arsenide (GaAs) HBT technology, targeting wide range handset device at operating frequency around 5 GHz. In the proposed design, mixed matching networks are utilized to enhance bandwidth, in conjunction with RC feedback, allowing its operation with high efficiency and comparable linearity at low supply voltage of 2.3V. Analysis of three-order intermodulation distortion (IMD 3 ) reduction is presented in detail. Experimental results show that a peak power-added-efficiency (PAE) of 47.2% is attained at 5GHz in this single stage PA. The prototype achieves a 23.2dBm saturated output power with power added efficiency above 40% across the bandwidth of 4.2-5.8GHz (32%) at continuous wave mode. This work has potential for broadband high efficiency Doherty PA used in future mobile communication systems.
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