A 25-Mb/s 4-ASK Receiver Front-End in 65-nm CMOS for Biomedical Data Telemetry via a Capacitive Link
A 25-Mb/s 4-ASK Receiver Front-End in 65-nm CMOS for Biomedical Data Telemetry via a Capacitive Link
Abstract:
This brief presents a 25-Mbps 4-amplitude-shift-keying (4-ASK) receiver front-end (RFE) for biomedical data telemetry via a series-resonant capacitive link. The RFE incor-porates low-power clock and data recovery (CDR) circuitry for synchronization in which a novel highly linear transconductance (Gm ) cell is employed in the phase detector (PD) to mitigate any possible error decisions while comparing the phase difference between the input and feedback signals. The proposed RFE is fabricated in 65 nm 1P8M standard CMOS, the core circuit occu-pies 0.11 mm2 , and consumes 2.9 mA from 1 V. While conducting ex vivo measurements using beef tissue and a series-resonant capacitive link, the proposed RFE is capable of processing 4-ASK data patterns up to 25 Mbps with bit error rate (BER) less than 10−3 and total jitter of ∼42 ns.
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A 25-Mb/s 4-ASK Receiver Front-End in 65-nm CMOS for Biomedical Data Telemetry via a Capacitive Link
