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A class EF2 power oscillator designed in standard 130 nm CMOS at 2.5 GHz frequency is presented. The oscillator relies on a direct path based on a power amplifier and a feedback path based on passive elements and an MOS varactor. Class EF2 is used to reduce voltage stress across the switch, enabling a higher output power for modern transistors with low breakdown voltage. The measurement on a class...
A fully integrated power amplifier using a power cell switching technique, implemented in 65 nm CMOS technology is presented. The main objective of the proposed architecture is to significantly improve the efficiency at high power back-off. To do so, distributed active transformers are used as the splitter, the combiner and the DC bias feed to partition the power requirements among the parallelised...
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