Cheap Design of Linear RF Outphasing Power Amplifiers (Book) (Xuejun Zhang, Lawrence E. Larson, Peter M. Asbeck, Peter Asbeck) Price
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| AUTHOR: | Xuejun Zhang, Lawrence E. Larson, Peter M. Asbeck, Peter Asbeck |
| CATEGORY: | Book |
| MANUFACTURER: | Artech House Publishers |
| ISBN: | 1580533744 |
| TYPE: | Amplifiers, Radio frequency, Electronics - Circuits - General, Engineering - Electrical & Electronic, Phase shifters, Power amplifiers, Radar, Science/Mathematics, Technology, Technology & Industrial Arts, Telecommunications |
| MEDIA: | Hardcover |
| # OF MEDIA: | 1 |
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Customer Reviews of Design of Linear RF Outphasing Power Amplifiers
Nothing New, Plenty Bad As a former systems engineer in a company that actually built wideband RF LINC amplifiers, I can state this book is an utter disappointment. It is badly written, riddled with mathematical inaccuracies, and needlessly complicated. Please do not buy it: you will not learn to design or understand LINC amplifiers.
1) Much of what has been covered in the book can be summarized in [1] [2] [3], and [4]. Several sections and figures have been lifted in its entirety from these references making the writing inconsistent and incoherent.
2) Zhang's analysis on the phase/gain calibration in LINC is needlessly complicated. This is, after all, a very elementary problem in adaptive filter theory. For a much simpler and practical solution see [3] and apply it with a single-tap FIR. The I/Q imbalance problem is well understood and does not require an advanced level text to explain it.
3) It is obvious that the authors have not built a LINC amplifier with a lossless combiner. Many of the complexities and problems encountered in that design are conveniently neglected. Instead, we are presented a regurgitation of the material in [3] and [4]. For a much more elegant explanation read Cripps's book.
4) The mathematical analysis of the two-tone imbalance in LINC channel is such a needless exercise; the authors offer no new insight and worse still, the analysis is replete with inaccurate assumptions and conclusions.
5) The work on power recovery by the authors is new. It is debatable, however, if the method is practical or offers any significant advantages over the lossless combining method.
6) Also, will the authors please note that we do not need to pay nearly $100 for an advanced level text that explains digital modulation and pulse shaping? There are much better undergraduate texts for these.
For a much better understanding of RF amplifiers, LINC or otherwise, stick with [4]. It is by far the best work we have seen in this field.
[1] "Efficiency of Outphasing RF Power-Amplifier Systems", F. Raab, IEEE Transactions on Communications, 1985, Vol. 33.
[2] "Amplification using amplitude reconstruction of amplitude and/or angle modulated carrier", Kolanek et. al., US-PTO number 6,147,553.
[3] "Adaptive algorithms for calibrating a LINC amplifier", Chandrasekaran R. et. al., RAWCON 2001
[4] "RF power amplifiers for wireless communication", S. Cripps, Chapter 8, Artech House