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Meledin, D.; Tong, C.-Y. E.; Blundell, R.; Goltsman, G. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Measurement of intermediate frequency bandwidth of hot electron bolometer mixers at terahertz frequency range |
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Journal Article |
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Year |
2003 |
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IEEE Microw. Wireless Compon. Lett. |
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IEEE Microw. Wireless Compon. Lett. |
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13 |
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11 |
Pages |
493-495 |
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waveguide NbN HEB mixers |
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Abstract |
We have developed a new experimental setup for measuring the IF bandwidth of superconducting hot electron bolometer mixers. In our measurement system we use a chopped hot filament as a broadband signal source, and can perform a high-speed IF scan with no loss of accuracy when compared to coherent methods. Using this technique we have measured the 3 dB IF bandwidth of hot electron bolometer mixers, designed for THz frequency operation, and made from 3-4 nm thick NbN film deposited on an MgO buffer layer over crystalline quartz. |
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1531-1309 |
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1509 |
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Author |
Ryabchun, Sergey; Tong, Cheuk-yu Edward; Blundell, Raymond; Kimberk, Robert; Gol’tsman, Gregory |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Stabilisation of a terahertz hot-electron bolometer mixer with microwave feedback control |
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Conference Article |
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Year |
2007 |
Publication |
Proc. 18th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 18th Int. Symp. Space Terahertz Technol. |
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193-198 |
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waveguide NbN HEB mixers, Allan variance, stability |
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Abstract |
We report on implementation of microwave feedback control loop to stabilise the performance of an HEB mixer receiver. It is shown that the receiver sensitivity increases by a factor of 4 over a 16-minute scan, and the corresponding Allan time increases up to 10 seconds, as opposed to an open loop value of 1 second. Our experiments also demonstrate that the receiver sensitivity is limited by the intermediate frequency chain. |
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