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Low-noise correlation measurements based on software-defined-radio receivers and cooled microwave amplifiers
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Review of Scientific Instruments, Volume 87, issue 11, pp. 1-5
Abstract
We present a microwave correlation measurement system based on two low-cost USB-connected software defined radio dongles modified to operate as coherent receivers by using a common local oscillator. Existing software is used to obtain I/Q samples from both dongles simultaneously at a software tunable frequency. To achieve low noise, we introduce an easy low-noise solution for cryogenic amplification at 600-900 MHz based on single discrete HEMT with 21 dB gain and 7 K noise temperature. In addition, we discuss the quantization effects in a digital correlation measurement and determination of optimal integration time by applying Allan deviation analysis.
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Elo, T, Lähteenmäki, P, Tan, Z, Cox, D & Hakonen, P J 2016, 'Low-noise correlation measurements based on software-defined-radio receivers and cooled microwave amplifiers', Review of Scientific Instruments, vol. 87, no. 11, 114706, pp. 1-5. https://doi.org/10.1063/1.4966971