A sensitive method to measure the integral nonlinearity of a digital-to-time converter based on phase modulation

Claudia Palattella, Eric A.M. Klumperink, Z. Ru, Bram Nauta

    Research output: Contribution to journalArticleAcademicpeer-review

    12 Citations (Scopus)
    106 Downloads (Pure)

    Abstract

    A digital-to-time converter (DTC) produces a time delay based on a digital code. Similar to data converters, linearity is a key metric for a DTC and it can be characterized by its integral nonlinearity (INL). However, measuring the INL of a subpicosecond-resolution DTC is problematic, even when using the best available high-speed oscilloscopes. In this brief we propose a new method to measure the INL of a DTC by applying digital phase modulation and measuring the output spectrum with a spectrum analyzer. The frequency selectivity of this method allows for an improved measurement resolution down to a few femtoseconds and allows measuring an INL below 100 fs. The proposed method is verified by behavioral simulations and is employed to measure the INL of a high-resolution DTC realized in the 65-nm CMOS, with a time resolution of 25 fs and a standard deviation of 27 fs.
    Original languageEnglish
    Pages (from-to)741-745
    Number of pages5
    JournalIEEE transactions on circuits and systems I: regular papers
    Volume62
    Issue number8
    DOIs
    Publication statusPublished - 1 Aug 2015

    Keywords

    • EWI-26256
    • IR-97703
    • METIS-312709

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