Abstract
AbstractIn this article, a cross cancellation power amplifier (CCPA) with negative group delay circuits (NGDCs) for an efficiency enhancement is proposed. The proposed CCPA with NGDCs consists of a balanced power amplifier (BPA), NGDCs, error amplifier, small signal amplifier, and magnitude/phase control circuits. The NGDC can remove delay elements of the conventional CCPA and improve output power and efficiency. The fabricated main BPA provides 44.37 dBm peak power, 71.3% drain efficiency, and 68% PAE at 2.14 GHz. The drain efficiency of the proposed CCPA with NGDCs is improved by 6.7% than the conventional CCPA. Moreover, adjacent channel leakage ratios of CCPA with NGDCs are improved by 12.2, 18.9, 17.7, and 14.2 dB at −10, −5, +5, and +10 MHz offset points with the WCDMA 4‐FAs (20 MHz) signal, respectively.
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