Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4939148
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Funding
- Department of Atomic Energy of Government of India
- Department of Science and Technology, India via the Ramanujan Fellowship
- Army Research Office [W911NF-14-1-0078]
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We present an impedance engineered Josephson parametric amplifier capable of providing bandwidth beyond the traditional gain-bandwidth product. We achieve this by introducing a positive linear slope in the imaginary component of the input impedance seen by the Josephson oscillator using a lambda/2 transformer. Our theoretical model predicts an extremely flat gain profile with a bandwidth enhancement proportional to the square root of amplitude gain. We experimentally demonstrate a nearly flat 20 dB gain over a 640MHz band, along with a mean 1-dB compression point of -110 dBm and near quantum-limited noise. The results are in a good agreement with our theoretical model. (C) 2015 AIP Publishing LLC.
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