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The Design of CMOS Radio-Frequency Integrated Circuits, Second Edition by Thomas H. Lee

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CHAPTER FIFTEENRF POWER AMPLIFIERS

15.1 INTRODUCTION

In this chapter, we study the problem of delivering RF power efficiently to a load. As we’ll discover very quickly, scaled-up versions of the small-signal amplifiers we’ve studied so far are fundamentally incapable of high efficiency, and other approaches must be considered. As usual, tradeoffs are involved, this time among linearity, power gain, output power, and efficiency.

In a continuing quest for increased channel capacity, more and more communications systems employ amplitude and phase modulation together. This trend brings with it an increased demand for much higher linearity (possibly in both amplitude and phase domains). The variety of power amplifier topologies reflects the inability ...

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