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Fully integrated CMOS power amplifier design using the ...

IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 37, NO. 3, MARCH 2002371 Fully integrated CMOS power amplifier DesignUsing the distributed Active-TransformerArchitectureIchiro Aoki, Student Member, IEEE, Scott D. Kee, David B. Rutledge, Fellow, IEEE, and Ali Hajimiri, Member, IEEEA bstract A novel on-chip impedance matching and power -combining method, thedistributed active transformeris combines several low- voltage push pull amplifiers efficientlywith their outputs in series to produce a larger output power whilemaintaining a 50- match. It also uses virtual ac grounds andmagnetic couplings extensively to eliminate the need for any off-chip component, such as tuned bonding wires or external induc-tors.

low-voltage CMOS power amplifier for the first time. Index Terms— Circular geometry, CMOS analog integrated cir- cuit, distributed active transformer, double differential, harmonic

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