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Cross Post-distortion Balanced Power Amplifier

Heungjae Choi, Yongchae Jeong, J. Stevenson Kenney, Chul Dong Kim
2007 IEEE MTT-S International Microwave Symposium Digest  

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In this paper, we propose a new distortion cancellation mechanism for a balanced power amplifier (BPA) structure using the carrier cancellation loop of a feedforward (FFW) and post-distortion (PoD) technique. We use the distortion generated within a portion of a BPA to cancel the distortion generated within the whole BPA. Samples of the signal and distortion from one part of the BPA are combined with a reference signal, and then those signals destructively combine to generate the error signal.
more » ... hen the error signal is injected into the output of another part of the BPA with the gain and phase control, the distortion generated by both part of the BPA are cancelled. The operating frequency bands of the implemented cross PoD BPA is the IMT-2000 (f 0 =2.14GHz) band. With the commercial high power amplifier of 240W PEP for base-station application, the adjacent channel leakage ratio (ACLR) measurement with WCDMA 4FA signal shows 18.6dB improvement at an average output power of 40dBm.
doi:10.1109/mwsym.2007.380289 fatcat:jsmyod3hp5g6ljxbmglnaop3xm
Citation

Heungjae Choi, Yongchae Jeong, J. Stevenson Kenney, Chul Dong Kim. "Cross Post-distortion Balanced Power Amplifier." IEEE MTT-S International Microwave Symposium Digest (2007)