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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 booklet he expands upon the information awarded in his past booklet which was once a most sensible vendor.

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4 that there is a reality to be faced with any of the “heavier” Doherty PAs described thus far, and in other literature. 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.

21. It is assumed now that the input-matching network effectively places a shunt resonator across the junction, such that the voltage across the junction is forced always to be sinusoidal. The input-matching network will also transform the generator impedance from its nominal 50-W value, down to form the input resistance R ; R may also include some parasitic on-chip resistance. This circuit can be analyzed more easily. The input sinusoidal generator amplitude Vin will cause a corresponding change in the sinusoidal amplitude Vs appearing across the junction.

1) although a practical implementation may beneficially use other networks to achieve this functionality. 1 Schematic for two-device Doherty PA. I m = f m (v in ), I p = f p (v in ) which are not necessarily simple linear functions of the input drive signal vin ; this is a substantial generalization of the simple case considered in RFPA, where ideal linear transconductive dependencies were assumed. Ideal harmonic shorts are assumed to be placed across each device, so that only fundamental voltage and current components are considered in the analysis.

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