A 28.1dBm class-D outphasing power amplifier in 45nm LP digital CMOS

A 2.25GHz outphasing power amplifier is implemented in a 45nm LP digital CMOS process. The PA is designed in class-D mode for low output impedance and good linearity. The PA delivers 28.1dBm peak CW power with 19.7% system efficiency (includes all drivers). Average OFDM power is 21.4/20.3dBm with efficiency 8.0/6.5% when transmitting WiFi/WiMAX signals respectively.

[1]  H. Chireix.  High Power Outphasing Modulation , 1935, Proceedings of the Institute of Radio Engineers.

[2]  Asad A. Abidi,et al.  An Outphasing Power Amplifier for a Software-Defined Radio Transmitter , 2008, 2008 IEEE International Solid-State Circuits Conference - Digest of Technical Papers.

[3]  R. Kaunisto,et al.  A 2.14-GHz Chireix outphasing transmitter , 2005, IEEE Transactions on Microwave Theory and Techniques.

[4]  Jingshi Yao,et al.  Power Amplifier Selection for LINC Applications , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[5]  W. Dehaene,et al.  A high-voltage output driver in a 2.5-V 0.25-/spl mu/m CMOS technology , 2005, IEEE Journal of Solid-State Circuits.

[6]  Lars Sundström,et al.  Investigation of a highly efficient LINC amplifier topology , 2001, IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211).

[7]  L.E. Larson,et al.  CMOS Outphasing Class-D Amplifier With Chireix Combiner , 2007, IEEE Microwave and Wireless Components Letters.