By Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps
The writer is a professional in RF amplifiers. during this e-book he expands upon the guidelines awarded in his past publication which was once a top vendor.
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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.
But even then, the problem of holding the device off over all but the upper few decibels of drive power remains. The most obvious and direct route to a possible solution is to use a device biased well beyond its cutoffa Class C amplifier. There are several practical problems involved in doing this; the extent to which the device has to remain cut off requires deep Class C bias, which then raises breakdown issues. It also raises gain and device periphery issues. However, it is a starting point and was the original method used by Doherty, with tubes, to demonstrate this configuration.
33 34 Advanced Techniques in RF Power Amplifier Design The technique has an Achilles heelthe need to convert a suitably profiled, linearized PA supply drive signal to the necessary high level of current and voltage required by the PA itself. This not only erodes the efficiency advantage, through the additional efficiency factor of a power converter, but also has an important impact on the maximum viable signal bandwidth. There is also a secondary issue of dynamic range; most RFPAs of standard design will display sufficient transmission, even with zero supply, to limit the dynamic range of the system to about 20 dB.