By Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps
The writer is knowledgeable in RF amplifiers. during this publication he expands upon the information provided in his past booklet which used to be a top vendor.
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Additional resources for Advanced Techniques in RF Power Amplifier Design
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 power contribution of the peaking device will also be greater as the breakpoint is set to lower PBO values. At this point, we seem to have a configuration which is sufficiently viable in a practical sense, to run a full scale simulation using real device models. 11 shows such a simulation, where the main and peaking devices are identical, but the main device has been optimized for a reasonable efficiency/linearity compromise.
This model incorporates the two essential textbook features of BJT operation: a base-emitter junction which has an exponential diode I-V characteristic, and a collector-emitter output current generator which supplies a multiplied replica of the current flowing in the base-emitter junction. 12 BJT model. them out. Such assumptions are quite justifiable in the modern era where 30-GHz processes are frequently used to design PAs below 2 GHz. It is worth emphasizing, however, that the input and output parasitics, usually capacitances, can still be quite high even in processes which yield useful gain at millimeter-wave frequencies.
Before pursuing some of these possibilities, however, it is worthwhile to consider an important generalization of the basic configuration, that of the asymmetrical Doherty PA. The key point about the so-called asymmetrical DPA is that the breakpoint can be stipulated. This will result in devices having nonequal values of IP and IM , and is highly relevant in applications where the PEP is much higher than the mean power such as in most modern communications systems. 7 shows the current and voltage backoff relationships for a typical asymmetrical DPA.
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