A High CMRR Differential Difference Amplifier Employing Combined Input Pairs for Neural Signal Recordings.
IEEE Trans Biomed Circuits Syst
; 18(1): 100-110, 2024 Feb.
Article
em En
| MEDLINE
| ID: mdl-37665710
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.
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Ácido Aminossalicílico
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Amplificadores Eletrônicos
Idioma:
En
Ano de publicação:
2024
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Article