Design of linear S-band power amplifiers with high power-added efficiency.(TECHNICAL FEATURE)

Microwave Journal, April, 2005 by Chua, T.W.; Teh, E.C.; Yeap, Y.W.

For most narrowband wireless devices, a power amplifier (PA) is normally used to boost the signal level, prior to transmission. The fundamental requirements in PA design are to achieve a high output power at the 1 dB compression point (P1dB), reasonable power gain and excellent power-added efficiency (PAE) at the design frequency. The challenge, however, comes when the designer has to simultaneously match for gain and power while minimizing the nonlinear distortion introduced by the PA. There is a trade-off between amplifier linearity and DC-to-RF power conversion efficiency. It is shown that the nonlinearity of a PA distorts the quality of a modulated signal. To analyze the impairments due to nonlinear distortion, the error vector magnitude (EVM) and error vector phase...

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