Low-noise correlation measurements based on software-defined-radio receivers and cooled microwave amplifiers

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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.

Details

Original languageEnglish
Article number114706
Pages (from-to)1-5
JournalReview of Scientific Instruments
Volume87
Issue number11
Publication statusPublished - 1 Nov 2016
MoE publication typeA1 Journal article-refereed

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