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 e-book which used to be a top vendor.
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Extra resources for Advanced Techniques in RF Power Amplifier Design
5, even if ideal transconductive characteristics are assumed. It turns out that the peaking current drive problem is less severe when a more generalized range of DPA cases is considered; it is possible to compromise the requirements of peaking current without losing the efficiency advantages of the configuration too quickly. But realization of the peaking PA characteristic is a problem which appears to get worse as more realistic device models are considered. This issue probably represents the main practical stumbling block for implementation of Doherty PAs in the modern era.
1 Introduction and Formulation The classical Doherty PA (DPA) was analyzed in some detail in RFPA (Chapter 8). 1, still uses two active devices but assumes a more generalized transistor transfer characteristic. So the basic elements are the two devices themselves, an impedance inverter, and a common RF load resistor. 1) although a practical implementation may beneficially use other networks to achieve this functionality. 1 Schematic for two-device Doherty PA. I m = f m (v in ), I p = f p (v in ) which are not necessarily simple linear functions of the input drive signal vin ; this is a substantial generalization of the simple case considered in RFPA, where ideal linear transconductive dependencies were assumed.
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.
Advanced Techniques in RF Power Amplifier Design by Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps