Journal
IEEE SOLID-STATE CIRCUITS LETTERS
Volume 5, Issue -, Pages 304-307Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSSC.2022.3231522
Keywords
Analog front-end (AFE); fly height sensor; hard-disk drive (HDD); low-noise interface; resistive sensor
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This letter presents an analog interface circuit for resistive sensor arrays, which achieves low noise and high performance signal readout.
This letter presents a fully analog interface circuit for resistive sensor arrays, fabricated in a 130-nm BiCMOS technology, which, exploiting the same devices for closed-loop sensor biasing and signal read-out, achieves 2-nV/ $\sqrt {\text {Hz}}$ total input-referred noise. The interface circuit can bias the sensors both with a constant voltage (voltage mode) or a constant current (current mode), with an active area of 1 mm 2, achieves 20-MHz bandwidth and less than 2- $\mu \text{s}$ biasing rise time, consuming 100.3 mW.
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