Using crosscorrelation to mitigate analog/RF impairments for integrated spectrum analyzers

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    An integrated spectrum analyzer is useful for built-in self-test purposes, software-defined radios, or dynamic spectrum access in cognitive radio. The analog/RF performance is impaired by a number of factors, including thermal noise, phase noise, and nonlinearity. In this paper, we present an integrated circuit with two integrated RF-frontends, of which the outputs are crosscorrelated in digital baseband. We show by theory and measurements that the above-mentioned impairments are mitigated by this technique. The presented 65-nm CMOS prototype operates at 1.2 V, and obtains a noise floor below 169 dBm/Hz, an of 25 dBm, and more than 20 dB of phase-noise reduction. In a special high-impedance mode, an even lower noise floor below 172 dBm/Hz is obtained.
    Original languageEnglish
    Pages (from-to)1327-1337
    Number of pages11
    JournalIEEE transactions on microwave theory and techniques
    Issue number3
    Publication statusPublished - 1 Mar 2013


    • METIS-297712
    • IR-86402
    • EWI-23468
    • Built-in self-test (BIST)
    • Cognitive radio (CR)
    • Crosscorrelation
    • Dynamic spectrum access
    • Noise reduction
    • Spectrum analyzer (SA)
    • Spectrum sensing


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