Distributed Active Transformer (DAT) based Power Amplifier Design
Our project "RF Power Amplifier for Wireless Communication " is a part of a 3 years research project titled " Flexible Reconfigurable Power Adaptive Power Amplifier " funded by National ICT R&D Fund. It aims to design a power amplifier in 130 nm CMOS technology that delivers 1W power with Power Added Efficiency (PAE) > 50%. Instead of the conventional transformer impedance transformation is achieved by Distributed Active Transformer (DAT) for the very first time in Pakistan. Losses are minimized by the proper adjustments of design parameters like the supply voltage, transistors size, inductor dimensions etc. for e.g.
DC supply is kept below 2 V to avoid breakdown, transistor size is made large enough to have on-resistance very small to achieve lower losses, series power combining technique based DAT ensures high-Q on-chip inductors and at the same time solves the issue of chip area by providing same inductances at comparatively smaller dimensions (slab inductors). Cadence and Sonnet are the simulation tools used in designing. AC, DC, S-parameter, large signal analysis was done in Cadence whereas the EM structures and Inductors were simulated in Sonnet. Optimum Simulation results will help EDC design team in their further research.
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