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 awarded in his past publication which was once a top vendor.
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Extra info for Advanced Techniques in RF Power Amplifier Design
Correct handling of harmonics is a necessary feature on the input, as well as the output, match. Situations where a device is being used well below its cutoff frequency may require, or will greatly benefit from, specific harmonic terminating circuit elements on the input. • The process of linearizing the response of a BJT includes the use of a specific, and very low, impedance for the base bias supply voltage. This is a very different bias design issue in comparison to the simple current bias used in small signal BJT amplifiers, or the simple high impedance voltage bias used in FET PAs.
Probably the least extreme case, in terms of neglect, has been the Envelope Elimination and Restoration (EER) method; this is widely attributed to Kahn, who published a paper on the technique  in the single sideband (SSB) era of the early 1950s. In fact, the application of high-level amplitude modulation (AM) to a Class C RFPA was common practice in the tube era, as any reference to contemporary ham radio literature will confirm. Kahns innovation was essentially the generation of a constant-amplitude, phase-modulated signal component which could be amplified using a nonlinear PA.
3 to include the dc components. The result is essentially the classical Doherty efficiency curve for a symmetrical configuration and a 6-dB breakpoint. The slightly sluggish start to the peaking PA conduction, caused by the Class C operation, causes some variation in the main PA voltage beyond the breakpoint. This also necessitates reducing the Zo value slightly in order to keep the main PA voltage swing below the stipulated supply rail value. The key feature is the return to Class B efficiency at the breakpoint, where the peaking device shuts down; thereafter as the drive power is further reduced, the efficiency drops down the conventional curve for a Class B PA.
Advanced Techniques in RF Power Amplifier Design by Steve, C. Cripps, Steve C. Cripps, Steve C. Cripps