By Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps
The writer is a professional in RF amplifiers. during this publication he expands upon the tips offered in his prior booklet which used to be a top vendor.
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Additional info for Advanced Techniques in RF Power Amplifier Design
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. In order to incorporate PAs with a wide range of cutoff and conduction angles, it is necessary to recall some of the results on the basic analysis of these modes.
In practice, any device having gain expansion will have higher-degree components, and multiple nulls in higher order IMs are often observed. 26 also shows a couple of apparent downsides; the power gain is reduced, surprisingly, as the gain expansion factor is increased. This is due to the reduction in gain at low drive levels and is actually more an artifact of the normalization of Imax than being a fundamental tradeoff. 26 also shows the ideal linear device as having no IM or distortion at drive levels lower than the onset of Class AB truncation.
8 shows such a realization, which now allows the efficiency to be computed. 7, some adjustment has to be made to the Zo value in order to keep the main device voltage below the allowable maximum value. The efficiency curve still looks quite attractive, despite an inevitably deeper dip in the mid-backoff region. Such an asymmetrical DPA would, on most counts, appear to be a more worthwhile target than the classical symmetrical version, for practical realization in modern applications. The asymmetrical DPA would normally be associated with high peakto-average power ratio signals, such as occur in wideband CDMA (WCDMA) or multicarrier systems.
Advanced Techniques in RF Power Amplifier Design by Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps