Driven by a high data rate and need for efficient spectrum utilization, modern communication standards like MoCA usually feature OFDM which has a high peak to average power ratio (PAPR). This constrains the designers to resort to the most linear version of PA, a Class-A PA. In addition to having a poor maximum efficiency, a Class-A PA’s efficiency degrades rapidly under back-off. On the other hand, a Class-B PA, albeit very non-linear compared to a Class-A PA, has a higher maximum efficiency and it degrades less rapidly under back-off.
Similar to the idea of pre-equalization used in communication, the input signal of the PA could be pre-distorted effectively to compensate for its non-linearity. In standard CMOS process, particularly with technology downscaling, the cost of digital signal processing has reduced dramatically, making it a smart choice to implement the pre-distortion in the digital domain.
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Karthik
About Me
- TJ
- New York, NY, United States
- I am Karthik, known to many as TJ, a student of Electrical Engineering at Columbia University in the great city of New York. I am doing PhD in Integrated Circuit (IC) Design. Engineering is my primary interest and it is my dream to become an engineer like Tony Stark (Iron man). Photography, running, cooking and aimless traveling are some of my other interests. Steve Jobs and Kamal Hassan (an Indian actor) are my biggest inspirations. I use this blog to share my travel experiences, interesting recipes and any other story that I feel compelled to share.
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