Envelope Tracking Power Amplifiers for Wireless by Zhancang Wang
By Zhancang Wang
This booklet offers entire advent, concept, and layout issues on envelope monitoring for instant communications.
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Additional info for Envelope Tracking Power Amplifiers for Wireless Communications
Sample text
Under such a drive condition, the current becomes the quasi-rectangular shape by the bifurcated current in the saturated operation. Therefore, the practical efficiency of the class-P PA can approach 90% [15–17]. By means of nonlinear output capacitors, a voltage waveform can be generated with the fundamental and a large second harmonic, as well as small higher-order harmonics. Meanwhile, only fundamental current is injected into the nonlinear capacitors. It indicates clearly that the nonlinear output capacitance Cout is the main source of the second harmonic voltage.
The distortions developed in the supply modulator can be introduced to the RF PA in different forms and, therefore, it requires extra powerful linearization methods to correct them. Linearity requirements force the use of new but more complex predistortion algorithms and high signal bandwidth requires a higher degree of timing alignment precision. Finally, although linearity and efficiency are mutually exclusive properties in traditional fixed DC supplied RF PAs, ET PAs can linearly amplify amplitude and phase-modulated signals with much higher efficiency.
Second, the class-E−1 PA operates with lower inductance values than the class-E counterpart. The internal parasitic inductance of packaged devices can be absorbed by the series inductor in the class-E−1 topology [65, 66]. The lower inductance value requirement means that the series resistance of inductor is reduced and that the inductor has a higher self-resonance frequency. Furthermore, as discussed in [11], the class-E−1 PA offers better scope for optimization for high efficiency at higher output power levels, as well as higher peak output power when compared to optimal class-E designs.