Effective Circuit Design Techniques to Increase Mosfet Power Amplifier Efficiency
نویسنده
چکیده
These impedance conditions correspond to the class F operating condition, the ideal voltage and current shapes for which are shown in Figure 1. Here a sum of odd harmonics produces a square voltage waveform and a sum of even harmonics approximates a half-sinusoidal current shape. In reality, both extrinsic and intrinsic transistor parasitic elements have a substantial effect on the efficiency, especially at high frequencies. By using only the active device die it is possible to reduce the influence of the parasitic elements in the power amplifier module. However, in this case it is necessary to take into account the main influence of the device output capacitance Cout. Z R E I
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