Jenkins, William James; (2001) Power amplifier linearisation through second-order bias injection. Doctoral thesis (Ph.D.), University College London (United Kingdom).

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Abstract

This thesis describes the development of a novel linearisation technique for use in high-frequency power amplifiers. The need for linear power amplifiers is identified, and existing linearisation schemes are outlined and appraised in terms of their complexity, cost and efficacy. It is shown that currently-available linearisation schemes tend to have an effectiveness that is proportional to their complexity, and hence their cost of implementation.Analysis and simulation results are presented to illustrate the mechanism through which the new linearisation technique reduces in-band distortion. The theoretical work is then verified with experimental measurements, initially using two unmodulated carriers and a feedback topology, and progressing to become a feedforward or injection technique using four unmodulated carriers. The agreement between the simulated and measured performance was found to be excellent throughout. The application of the technique to modulated real-world signals is then investigated, with theoretical analysis, simulations and measured results presented to demonstrate the applicability of the technique to both single and multiple modulated-carrier input signals. It is shown that Second-Order Bias Injection can typically provide 15-18dB of in-band distortion improvement, and that the technique has potential for use in next-generation (2G+ and 3G) mobile telecommunication networks.

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