Techniques for Low Voltage Power Amplifier Matching
Peter Topham and Mark Bolt
There is rapid expansion in the use of short range digital wireless systems, using the license-free allocations around 915 MHz in the USA and 869 MHz in Europe that permit up to 1 watt output power. These RF systems now use digital signal processing (DSP) for modulation and demodulation so to get better circuit packing density, and take advantage of finer IC process geometries that generally use low voltage supplies. Of course, lower operating voltages have the further benefit that they reduce the power consumption of the digital circuits, always an important parameter in battery powered products.
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