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A High CMRR Differential Difference Amplifier Employing Combined Input Pairs for Neural Signal Recordings | IEEE Journals & Magazine | IEEE Xplore

A High CMRR Differential Difference Amplifier Employing Combined Input Pairs for Neural Signal Recordings


Abstract:

This article introduces a Combined .symmetrical and complementary Input Pairs (CIP) of a Differential Difference Amplifier (DDA), to boost the total Common-Mode Rejection...Show More

Abstract:

This article introduces a Combined .symmetrical and complementary Input Pairs (CIP) of a Differential Difference Amplifier (DDA), to boost the total Common-Mode Rejection Ratio (CMRR) for multi-channel neural signal recording. The proposed CIP-DDA employs three input pairs (transconductors). The dc-coupled input neural signal connection, via the gate terminal of the first transconductor, yields a high input impedance. The high-pass corner frequency and dc quiescent operation point are stabilized by the second transconductor. The calibration path of differential-mode gain and Common-Mode Feedback (CMFB) is provided by the proposed third transconductor. The parallel connection has no need for extra voltage headroom of input and output. The proposed CIP-DDA is targeted at integrated circuit realization and designed in a 0.18-μm CMOS technology. The proposed CIP-DDAs with system CMFB achieve an average CMRR of 103 dB, and each channel consumes circa 3.6 μW power consumption
Published in: IEEE Transactions on Biomedical Circuits and Systems ( Volume: 18, Issue: 1, February 2024)
Page(s): 100 - 110
Date of Publication: 04 September 2023

ISSN Information:

PubMed ID: 37665710

Funding Agency:


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