An ultra low energy FSK receiver with in-band interference robustness exploiting a 3-Phase chirped LO

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    Abstract

    An ultra-low-energy Binary Frequency Shift Keying (BFSK) receiver is proposed. It features improved in-band interference tolerance by chirping the transmission frequency. To reduce the receiver power consumption, a novel three-phase passive mixer along with a three stage digitally controlled ring oscillator is proposed, while still allowing quadrature detection. A mixer-first direct conversion receiver architecture moves the required gain to lowest frequency and lowest bandwidth to reduce power consumption. A low power flip-flop based BFSK demodulator is proposed that reduces the baseband power further. The receiver is designed and fabricated in a 65 nm complementary metal-oxide-semiconductor process. It consumes 219 μW from 1.2 V power supply, while having a sensitivity of -70 dBm for a bit error rate of 0.1% at 2.4 GHz. Except the off-chip 64 MHz clock generation, the total receiver requires 27 pJ/bit. Using a chirped clock spreading of 360 MHz and chirp repetition rate of 1 MHz, it can tolerate up to -8 dB signal to interference ratio for all interferer frequencies. This is 13.5 dB better than previously reported in literature and 12 dB better than ideal noncoherent BFSK receiver interference robustness.
    Original languageEnglish
    Pages (from-to)248-261
    Number of pages14
    JournalIEEE journal on emerging and selected topics in circuits and systems
    Volume4
    Issue number3
    DOIs
    Publication statusPublished - 1 Sep 2014

    Keywords

    • EWI-25119
    • METIS-306046
    • IR-92037

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