Switched-Capacitor-Based Preamplifier Circuit for Hearing Aid Devices
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Abstract
This paper presents a switched-capacitor design for a preamplifier hearing aid circuit. The proposed circuit achieves good linearity in a wide range of amplification frequencies compared to the conventional type. The total power consumption of the proposed preamplifier is 1.093 W. Undesirable outband high-frequency noise can be removed by the proposed preamplifier circuit before connecting to the analog-to-digital converter (ADC) in the front-end of the hearing aid. The third harmonic distortion ratio HD3 is 44.39 dB while the figure of merit (FOM) is considerably better than the conventional type. The front-end of the hearing aid device occupies less area, is more energy efficient, and exhibits a noise level of 13 nV/
. The design simulation is performed using LTspice software.
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