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This paper describes a 2.5G cellular transceiver with standard DigRF interface, implemented in a low-cost 0.13mum CMOS process. This is the first CMOS single-chip, polar closed-loop transmitter, excluding the power amplifier (PA). This transmitter achieves an efficiency of 26% in EDGE mode by linearizing a saturated PA in a closed-loop feedback system. This is much higher than the typical 15-to-18%...
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