Efficienc Enhancement - Linear CMOS RF Power Amplifiers for Wireless Applications - page 14

2.4 Conclusion
This chapter presented the motivation and some basic concepts of efficiency en-
hancement of RF PAs. The main works dealing with PA supply modulation for
efficiency enhancement purposes were covered. It was discussed that using enve-
lope elimination and restoration can result in a high efficiency improvement, but it
places a very stringent requirement on the modulator design. The dynamic supply
technique, although offering lower efficiency improvement than EER, has looser
modulator requirements and, hence, is a good compromise for the implementation
of efficiency-enhanced PAs. Table 2.1 summarizes the main performance metrics of
the most important works on efficiency enhancement found in the literature. It shows
that the performance of the EER and the dynamic supply techniques are comparable
and that none of the works on dynamic supply integrates both the modulator and the
RF power amplifier on the same die. In the next two chapters, the design and exper-
imental characterization of a full-CMOS implementation of the dynamic supply RF
power amplifier are presented.
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