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This paper presents a practical application of a method for generating slew-rate limited envelopes in order to drive the dynamic supply of envelope tracking (ET) power\ud amplifiers (PAs). The proposed method results useful to generate slower versions of the transmitted signal’s envelope\ud to cope with the slew-rate and bandwidth limitations of envelope amplifiers. Moreover, this paper shows experimental results comparing the performance of ET when\ud exciting the drain of a PA (based in a GaN transistor) with both the envelope of the signal and the slew-rate limited version of the envelope.Postprint (published version

Tthis paper presents specifications and steps of designing a microwave narrowband low noise amplifier working at 12 GHz. It is described the design from theoretical base for modeling amplifier, simulation and optimization with ADS -Advanced Design System, as well as drawing the prototype layout. The obtained results of the measurements show that the amplifier satisfies most of goals such as wideband, stability and economic cost.

This paper presents a study on the trade-off between the envelope's slew-rate and the drain efficiency when slower envelopes are considered to dynamically supply the power amplifier (PA). This paper discusses a method to limit the slew-rate (and consequently the bandwidth) of the signal's envelope. Moreover, since the envelope tracking (ET) technique using a slower version of the original envelope introduces nonlinear distortion, slow envelope dependent predistortion has to be also incorporated in the design of ET PAs. Experimental results showed that it is possible to find a compromise between the bandwidth and slew-rate reduction (necessary to cope with the specific envelope amplifier requirements) and the amount of drain efficiency degradation suffered due to the use of a slower version of the original envelope.