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APA4ort.xyz Knowledge Graph. (2026). A 13.9-nA ECG Amplifier Achieving 0.86/0.99 NEF/PEF Using AC-Coupled OTA-Stacking. Retrieved May 24, 2026, from https://4ort.xyz/entity/a-13-9-na-ecg-amplifier-achieving-0-86-0-99-nef-pef-using-ac-coupled-ota-stacking