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A 400-MHz ultra low-power radio front-end for medical implantable applications has been implemented in a 0.13-mum CMOS technology. The circuit consists of an up-converter, a down-converter, and a LO frequency synthesizer. The up-converter employs a push-pull PA, which achieves a saturated output power of 0 dBm with a maximum power added efficiency of 32%. Moreover, the up-converter exhibits a -30-dBc...
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