Distributed active transformer
Distributed active transformer is a circuit topology that allows low-voltage transistors to be used to generate large amounts of RF (radio frequency) power. Its main use has been in making integrated CMOS power amplifier for wireless applications, such as GSM/GPRS cellular phones.
At the time it was introduced{{When?|date=October 2014}}, the distributed active transformer performance improved more than an order of magnitude relative to the previous state of the art.Ali Hajimiri. [https://web.archive.org/web/20090628172156/http://www.spectrum.ieee.org/semiconductors/devices/my-favorite-chip/0 ieee.org – "My Favorite Chip"] 2009
Output power of up to 2.2 Watt in S-band was demonstrated back in 2002, utilizing Distributed active transformer which combine the power of four differential power amplifiers.{{cite book |last1=Rhee |first1=Woogeun |title=Wireless Transceiver Circuits System Perspectives and Design Aspects |date=2015 |publisher=CRC Press |isbn=978-1-4822-3435-0 |pages=258–268 }}
References
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External links
- [https://thesis.library.caltech.edu/2129/ Thesis - Distributed Active Transformer for Integrated Power Amplification - Ichiro Aoki (2002) - California Institute of Technology]
- [https://ieeexplore.ieee.org/document/4684620 Aoki, I.; Kee, S.; Magoon, R.; Aparicio, R.; Bohn, F.; Zachan, J.; Hatcher, G.; McClymont, D.; Hajimiri, A.; "A {{Sic|hide=y|Fully|-}}Integrated Quad-Band GSM/GPRS CMOS Power Amplifier"; Solid-State Circuits, IEEE Journal of; Dec. 2008]
- [https://ieeexplore.ieee.org/document/987090 Aoki, I.; Kee, S.D.; Rutledge, D.B.; Hajimiri, A.; "Fully Integrated CMOS Power Amplifier Design Using the Distributed Active-Transformer Architecture"; Solid-State Circuits, IEEE Journal of; Mar. 2002]
- [https://ieeexplore.ieee.org/document/981284 Aoki, I.; Kee, S.D.; Rutledge, D.B.; Hajimiri, A.; "Distributed Active Transformer - A New Power-Combining and Impedance-Transformation Technique"; Microwave Theory and Techniques, IEEE Transactions in January 2002]
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