Abstract:
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)...View moreMetadata
Abstract:
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 [3]. 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 [4].
Date of Conference: 17-21 February 2019
Date Added to IEEE Xplore: 07 March 2019
ISBN Information: