By Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps
The writer is knowledgeable in RF amplifiers. during this ebook he expands upon the tips awarded in his past publication which was once a most sensible vendor.
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Additional resources for Advanced Techniques in RF Power Amplifier Design
There is, however, another side to the asymmetrical coin; there may be some benefit in having a peaking device with a lower peak current. One of the reasons for examining this concept is that in practice this will be the case if two similar devices are used, in an attempt to realize a classical configuration. 8 Asymmetrical Doherty PA; peaking function realized using Class C and scaled periphery device. Doherty and Chireix 47 the maximum peak current in the main device, the peaking device is only producing a fundamental component of about 40% of the main device component, IM .
13. 13 is of a highly nonlinear device. But this impression can be tempered by the realization that, unlike in the previous FET analysis, the voltage appearing across the baseemitter junction is no longer a linear mapping of the voltage appearing at the terminals of the RF generator; the input impedance of the RF BJT also displays highly nonlinear characteristics. It is the interaction of these two nonlinear effects which has to be unraveled, to gain a clear understanding of how one can possibly make linear RFPAs using such a device.
5 RF current, voltage amplitudes, and efficiency for Doherty PA using nonlinear peaking device. 5); and conventional Class B performance shown for comparison. 44 Advanced Techniques in RF Power Amplifier Design peaking current characteristic, one can quickly drift into a mode of thinking which verges on the cavalier; almost anything will do, within some rather broad boundary conditions. It raises the important concept that there is really no requirement that the main and peaking devices need to be matched in any way; different technologies, FET/BJT mixes, simple analog bias and gain adaption, all become possibilities for realizing the peaking PA function.