Abstract
In this paper, a fully-differential low-power low-noise neural recording amplifier with a novel recycling telescopic-cascode (RTC) operational transconductance amplifier (OTA) is presented. In the proposed RTC OTA, the current recycling and cross-coupled transistors with local positive feedback are utilized to significantly improve the OTA’s parameters like small-signal DC gain and unity-gain bandwidth. The gain enhancement also improves the linearity in the closed-loop structure. Extensive analytical calculations and simulation results using TSMC 0.18-µm CMOS process are provided to examine the usefulness of the proposed OTA. The simulated neural recording amplifier achieves 3.55 µVrms input-referred noise over 1 Hz-10 kHz bandwidth with 3.03 and 1.22 noise efficiency factor for local field potential (LFP) and action potential (AP) bands, respectively. The total harmonic distortion (THD) is −41.7 dB for a 1 mVpp, 1 kHz sinusoidal input signal. The total power consumption is 1.70 µW from a single 1.8-V power supply.
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