2. R. Brama, L. Larcher, A. Mazzanti, and F. Svelto, A 30.5 dBm 48% PAE CMOS Class-E PA with integrated balun for RF applications, IEEE J Solid-State Circuits 43 (2008), 1755-1762. 3. V.A. Solomko and P. Weger, A fully integrated 3.3-3.8-GHz power amplifier with autotransformer balun, IEEE Trans MicrowaveABSTRACT: This article presents how to compute the coupling loss between a transmitter and a receiver with full-wave electromagnetic software. An analytical method based on asymptotic spherical diffraction is proposed, and results of coupling loss between antennas on an un-named aerial vehicle are compared. Extension to other aircraft sizes is discussed.

We demonstrate a single stage 90nm CMOS power amplifier for 2.3-2.7GHz WiMAX (802.16e) band applications. An integrated BALUN is used to match the output to 50ohm load. The PA gain and saturated power are +18dB and +32dBm, respectively, working from a 3.3V supply, with a peak power added efficiency (PAE) of 48%. Digital pre distortion (DPD) technique is used to enhance the PA linearity. The measured EVM for a 64-QAM OFDM signal is improved from -24dB to -30dB at +25dBm output power. Compliance with the FCC 10MHz WiMAX mask is demonstrated at +25dBm of output power with power efficiency of ~25%. Under these conditions, the measured second harmonic level at the PA output is -31[dBm/MHz].

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