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Power amplifiers for CDMA and WCDMA applications must provide competitive power efficiency at low power levels as well as at full power. This paper presents a novel approach that utilizes a modified Doherty architecture as a solution to this problem. PA ICs in both cellular and PCS bands are presented. Typical performance is -50dBc ACPR at PAE levels of 40% in high power mode (+28 dBm) and 21% in low power mode (+16.5 dBm). Design methodology, new cell geometry and manifold are also discussed.
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Apel et al. (2007) studied this question.