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High Efficiency Feedforward Power Amplifier Using a Nonlinear Error Amplifier and Offset Alignment Control 

10/2/2014

 

A. Khanifar, R. Braithwaite | 2012 |

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Abstract — A high efficiency feedforward power amplifier (FFPA) is proposed that uses the Doherty configuration for both the main amplifier (MA) and error amplifier (EA). Using a nonlinear EA is a deviation from the traditional FFPA. A loop control algorithm is proposed that offsets the alignment setting from the standard value to best utilize the power handling capability and linearity of the MA and EA. A system efficiency of 25% is achieved for a rated power of 52.7 dBm, while exceeding the WCDMA specifications. Reducing the peak-to-average power ratio (PAPR) of the input signal to 8 dB and using offset control improves the ACLR performance to -62 dBc.

Conclusion

A feedforward power amplifier with a rated power of 52.7 dBm uses a nonlinear error amplifier to increase system efficiency to 25%. Crest factor reduction and offset alignment control improve the ACLR performance to -62 dBc.


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