Qureshi, A. (ECE) – ISoC: A Universal Impedance Spectroscopy Instrument-on-Chip in SKY130 130 nm CMOS

Electrochemical impedance spectroscopy (EIS) is the workhorse measurement behind lithium-ion battery diagnostics, biosensing, and corrosion science — yet no integrated circuit has ever delivered the complete capability of a benchtop analyzer on a single die.

This dissertation presents ISoC, the first universal Impedance Spectroscopy instrument-on-chip. Designed in SkyWater 130 nm CMOS process, ISoC supports all four standard electrochemical measurement modes and performs Fourier analysis, calibration, and model fitting directly on-chip. The work introduces a new delta-sigma transimpedance amplifier that breaks a long-standing sensitivity–bandwidth tradeoff in current measurement. It also presents the first application of digital predistortion — a technique borrowed from wireless transmitter design — to electrochemical instrumentation, reducing calibration error by more than an order of magnitude. The design is validated through a ten-level verification methodology spanning from transistor-level simulation to FPGA emulation — an approach that uncovered silicon-critical bugs prior to fabrication.

Event Host: Azzam Qureshi, Ph.D. Candidate, Electrical & Computer Engineering

Advisor: Ken Pedrotti

Zoom: https://ucsc.zoom.us/j/93312223921?pwd=jzCP7f8gbzqbkFGabEd4wM7O5TgHIH.1

Passcode: 342251