Download e-book for kindle: 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

ISBN-10: 1580532829

ISBN-13: 9781580532822

The writer is a professional in RF amplifiers. during this e-book he expands upon the information provided in his past publication which was once a top vendor.

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In order to illustrate an important point, a somewhat arbitrary device characteristic is shown. 5; clearly, there is a distinct “violation” of the original requirements for the peaking device, in that the peaking device never fully shuts down, and is palpably nonlinear. The voltage curves, therefore, tell an interesting story. First and foremost, the peaking device voltage Vp still shows the ideal linear response pertinent to Class B operation. The main device voltage shows only an approximation to the required characteristic.

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. (Unlabeled dotted line is conventional Class B efficiency, for comparison. 1. Zo is adjusted in each case. Dotted line shows conventional Class B efficiency characteristic. 3; this gives less efficiency improvement in the upper drive range, but quite substantial improvements in the −10-dB backoff region, in comparison to a conventional Class B arrangement.

The Chireix outphasing method, on the other hand, does not seem to stand up quite so well to modern CAD analysis, but some of its elements are well worth studying. 1 Introduction and Formulation The “classical” Doherty PA (DPA) was analyzed in some detail in RFPA (Chapter 8). 1, still uses two active devices but assumes a more generalized transistor transfer characteristic. So the basic elements are the two devices themselves, an impedance inverter, and a common RF load resistor. 1) although a practical implementation may beneficially use other networks to achieve this functionality.

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

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