Abstract
A new monolithic microwave integrated circuit power amplifier for 802.11b/g wireless local area network (WLAN) has been implemented using the load modulation concept of a Doherty amplifier. The λ/4 transmission line for the load modulation circuit of the carrier amplifier is replaced by a lumped element based π-network, which dual functions as an output matching network, simultaneously. This amplifier shows that error vector magnitude is about 4.6% and power added efficiency (PAE) about 31.8% at Pout of 19 dBm for a 802.11g 64QAM signal. PAE of the power amplifier is about 49.6%, and adjacent channel leakage ratio below 37.2dBc at 11 MHz offset at Pout of 23 dBm for the 802.11b complementary code keying signal.
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