A 60GHz CMOS Power Amplifier with Cascaded Asymmetric Distributed-Active-Transformer Achieving Watt-Level Peak Output Power with 20.8% PAE and Supporting 2Gsym/s 64-QAM Modulation
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Since its invention in early 2000s, Distributed Active Transformer (DAT) has been a popular power-combiner technique for high-power high-efficiency Power Amplifiers (PAs) in voltage-limited Silicon processes at GHz frequencies [1, 2]. However, successful DAT implementations at high mm-wave frequencies still remain elusive. Substantial inter-winding capacitance causes asymmetry in impedance transformation among the DAT sections, resulting in mismatched and non-optimum loads for high-frequency mm-wave DAT PAs, including those using transformer-based DAT combiners . Moreover, the DAT physical size at mm-wave frequencies is comparable to a mm-wave signal wavelength, which leads to significant physical phase delays between DAT sections. As a result, the combined vectoral signal at the DAT output is substantially mismatched, causing appreciable degradation in the DAT output power and efficiency . Show more
Book title2019 IEEE International Solid-State Circuits Conference (ISSCC)
Pages / Article No.
Organisational unit09757 - Wang, Hua / Wang, Hua
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