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A 2.4 GHz Multi-Channel FBAR-based Transmitter With an Integrated Pulse-Shaping Power Amplifier

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4 Author(s)
Paidimarri, A. ; Massachusetts Institute of Technology (MIT), Cambridge, MA, USA ; Nadeau, P.M. ; Mercier, P.P. ; Chandrakasan, A.P.

A 2.4 GHz TX in 65 nm CMOS defines three channels using three high- {\rm Q} FBARs and supports OOK, BPSK and MSK. The oscillators have {-} 132 dBc/Hz phase noise at 1 MHz offset, and are multiplexed to an efficient resonant buffer. Optimized for low output power \approx {-} 10 dBm, a fully-integrated PA implements 7.5 dB dynamic output power range using a dynamic impedance transformation network, and is used for amplitude pulse-shaping. Peak PA efficiency is 44.4% and peak TX efficiency is 33%. The entire TX consumes 440 pJ/bit at 1 Mb/s.

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Solid-State Circuits, IEEE Journal of  (Volume:48 ,  Issue: 4 )