Advanced Techniques in RF Power Amplifier Design by Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps

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 guidelines provided in his earlier e-book which was once a most sensible vendor.

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Advanced Techniques in RF Power Amplifier Design

The writer is a professional in RF amplifiers. during this ebook he expands upon the guidelines offered in his past publication which used to be a top vendor.

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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. Ideal harmonic shorts are assumed to be placed across each device, so that only fundamental voltage and current components are considered in the analysis.

19 Gain compression and efficiency versus output power. 20 Gain and efficiency for different input resistance values. 75). 5-dB gain variation over the 20-dB sweep range. 25 shows a better input power match to the device, but requires a higher Iq setting in order to maintain the stipulated linearity; this lowers the efficiency. Higher R values result in similar good linearity at lower Iq settings and higher efficiency, but lower power gain. 5 seem to represent a good overall compromise. These results appear to show the BJT as a very promising device for high efficiency linear RFPA applications.

Conversely, the large n values required to approach the Class B condition are unlikely to be realized in practice due to the limited switching speed of a typical RF transistor. 9 Current waveforms having “maximally flat” even harmonic components (n factor indicates the number of even harmonics). 9 into corresponding transfer characteristics, assuming a sinusoidal voltage drive. 10. 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.

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