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A 2.4 GHz Fully Integrated Cascode-Cascade CMOS Doherty Power Amplifier

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3 Author(s)
Li-Yuan Yang ; Nat. Taiwan Univ., Taipei ; Hsin-Shu Chen ; Yi-Jan Chen

This letter presents the first CMOS Doherty power amplifier (PA) fully integrated on chip. The "cascode-cascade" amplifier architecture is proposed to get rid of the bulky power splitter and facilitate the integration. The quarter wavelength transmission lines are replaced by the lumped component networks such that the whole amplifier circuit can be squeezed into the die size of 1.97 times 1.4 mm2. Fabricated in 0.18 mum CMOS technology, the 3.3 V PA achieves 12 dB power gain. The measured output power and power added efficiency (PAE) at P1 dB are more than 21 dBm and 14%, respectively. The PAE at 7 dB back-off from P1 dB is above 10% and the PAE degradation is less than 29%.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:18 ,  Issue: 3 )

Date of Publication:

March 2008

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