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

The writer is knowledgeable in RF amplifiers. during this e-book he expands upon the information offered in his past e-book which used to be a top vendor.

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Can make linear, highly efficient PAs, but they appear to have design flexibility which makes them arguably superior to the more ubiquitous FET devices. But in order to harness this potential, several basic design issues must be observed, namely: • The input matching configuration, including the bias circuit, has a major impact on the operation of a BJT RFPA. • The input match will show different optima for maximum gain, best linearity, and highest efficiency. Optimization of the second two may involve substantial reduction in power gain.

7 shows the current and voltage backoff relationships for a typical asymmetrical DPA. In this case, the breakpoint is a much lower backoff point than the classical 6-dB breakpoint. It can be seen that to achieve this, the two devices have different maximum currents, so that the ratio between IP and IM , defined above as G, now becomes an additional design parameter. The determination of design values for R, Zo , and G is, however, still quite straightforward. 7 Asymmetrical Doherty PA; current and voltage characteristics for main and peaking devices plotted against input drive signal amplitude.

But realization of the peaking PA characteristic is a problem which appears to get worse as more realistic device models are considered. This issue probably represents the main practical stumbling block for implementation of Doherty PAs in the modern era. There has been a justifiable reluctance to tackle this problem using “smart” bias adaptation, or switch/attenuator controls, because such techniques instantly corrupt the elegant simplicity of a “self-managing” DPA. It appears, however, that this is a step which must reluctantly be taken.

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