By Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps
The writer is knowledgeable in RF amplifiers. during this e-book he expands upon the tips provided in his prior publication which used to be a top vendor.
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Extra resources for Advanced Techniques in RF Power Amplifier Design
4 RF current, voltage amplitudes and efficiency for Doherty PA using Class C peaking device. 3 to include the dc components. The result is essentially the classical Doherty efficiency curve for a symmetrical configuration and a 6-dB breakpoint. The slightly sluggish start to the peaking PA conduction, caused by the Class C operation, causes some variation in the main PA voltage beyond the breakpoint. This also necessitates reducing the Zo value slightly in order to keep the main PA voltage swing below the stipulated supply rail value.
Once again, it is not possible to plot an efficiency curve without making some stipulations about how the peaking amplifier will be realized. 3 (Vq < 0 cases), it is clear that the peaking device periphery must be scaled up, by at least the G factor. On the other hand, the requirement for a lower breakpoint value does somewhat alleviate the periphery requirements of the peaking device if a simple Class C approach is used. 8 shows such a realization, which now allows the efficiency to be computed.
It seems that an unfamiliar device characteristic emerges from this simple analysis, which displays efficiency in the mid-70% region and has only even order nonlinearities. It has a much slower turn-on characteristic than the classical FET dogleg, and resembles a bipolar junction transistor (BJT), rather than an FET in its general appearance. 10 also shows that the desired family of linear, highly efficient characteristics fall into a well-defined zone. The boundaries of the zone are formed by the square-law characteristic, and the classical Class B dogleg.