Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps's Advanced Techniques in RF Power Amplifier Design PDF
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 awarded in his earlier booklet which was once a most sensible vendor.
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Extra resources for Advanced Techniques in RF Power Amplifier Design
Practical realization of the peaking PA function by scaling of the device periphery and Class C biasing runs into an escalation of practical difficulties. Alternatives, in the form of bias adaption and DSP amplitude control, need to be pursued. But the Doherty-Lite approach gives some more modest benefits whilst retaining a viable and simple practical circuit. 10 shows the peaking current and efficiency characteristics for three bias settings of the peaking device. 9 Doherty-Lite PA using same device type for main and peaking functions.
Mathematical reasoning shows that it is feasible to specify a device characteristic that increases efficiency all the way up to 78% by the use of only even order nonlinearities. Such a device will not generate undesirable close-to-carrier intermodulation distortion. The bipolar device emerges from this analysis very favorably, so long as its parasitics can be minimized at the frequency of intended use. The pragmatist may well find much to question in the analyses and device models used in this chapter.
Class AB Amplifiers 13 The necessary characteristic can be determined by finding suitable coefficients of the even harmonic series, i o = k o + cos q + k 2 cos 2q + k 4 cos 4 q + k 6 cos 6q + K + k 2 n cos 2n q normalized such that 0 < i0 < 1. The goal here is to find a set of coefficients which generates a waveform having the same peak-to-peak swing, from zero to unity, but which has decreasing mean value as successive even harmonic components are added. The optimum case will be a situation where the negative half cycles have a maximally flat characteristic at their minima; this corresponds to values of the kn coefficients determined by setting successive derivatives of the function f (q) = cos q + k 2 cos 2q + k 4 cos 4 q + k 6 cos 6q + K + k 2 n cos 2n q equal to zero at θ = p.
Advanced Techniques in RF Power Amplifier Design by Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps