A 15-Ch. 0.019 mm2/Ch. 0.43% Gain Mismatch Orthogonal Code Chopping Instrumentation Amplifier SoC for Bio-Signal Acquisition
2019 IEEE Asian Solid-State Circuits Conference (A-SSCC), 2019•ieeexplore.ieee.org
This paper proposes a 15-Ch. low power, small area, Orthogonal Code Chopping
Instrumentation Amplifier (OCCIA). Orthogonal codes directly modulate each channel and
merge into a single IA while performing dynamic offset compensation. Digitization-Before-
Demodulation (DBD) transmits the combined data directly, which alleviates ripple noise, and
completely removes the demodulation and TX encoding overhead from the SoC. The
proposed OCCIA SoC in 0.18 μm 1P6M CMOS achieves the lowest gain mismatch (0.43%) …
Instrumentation Amplifier (OCCIA). Orthogonal codes directly modulate each channel and
merge into a single IA while performing dynamic offset compensation. Digitization-Before-
Demodulation (DBD) transmits the combined data directly, which alleviates ripple noise, and
completely removes the demodulation and TX encoding overhead from the SoC. The
proposed OCCIA SoC in 0.18 μm 1P6M CMOS achieves the lowest gain mismatch (0.43%) …
This paper proposes a 15-Ch. low power, small area, Orthogonal Code Chopping Instrumentation Amplifier (OCCIA). Orthogonal codes directly modulate each channel and merge into a single IA while performing dynamic offset compensation. Digitization-Before-Demodulation (DBD) transmits the combined data directly, which alleviates ripple noise, and completely removes the demodulation and TX encoding overhead from the SoC. The proposed OCCIA SoC in 0.18μm 1P6M CMOS achieves the lowest gain mismatch (0.43%) among recent multi-channel IAs with one of the smallest areas (0.019mm 2 /ch.) while consuming 1.97μW/ch. and low crosstalk (<; -53.5dB) at 490Hz bandwidth.
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