Abstract
Most wireless applications must accomplish stringent linearity normative specifications that prioritize parameters, such as adjacent channel power ratio (ACPR) or error vector magnitude (EVM), in front of power efficiency, the last being a quality parameter usually defined by the manufacturer. One possible solution capable of satisfying both requirements is the use of a linearizing structure for the power amplifier, the feedforward amplifier being one of the most suitable for wideband applications. The paper presents a study focused on the effects of disappointments on the delay paths and on the directional coupler factor in the feedforward structure. Therefore, a theoretical analysis on the tradeoff existing between the degradation on the ACPR and the improvement of the overall power added efficiency (PAE) is presented. The study has been carried out using a 22 MHz bandwidth /spl pi//4 DQPSK modulated signal.
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