Design of Low Power Preamplifier for Hearing Aid Applications

Abstract

A microphone preamplifier having low power, low noise and high phase margin for use in hearing aid applications is proposed. The preamplifier uses two-stage topology utilizing self cascode transistors for improving the gain by decreasing the channel length modulation effect and increasing the output impedance. Simulations have been performed in Cadence Virtuoso using SCL 180 nm technology parameters and comparative analysis with other state of art preamplifier design is performed. Simulation result shows that the proposed preamplifier achieves a gain of 20 dB with a bandwidth of 19.2 kHz. The power reported is 9.8 µW which is lower than most of the reported designs which further demonstrates the effectiveness of the proposed design.

Keywords: Preamplifier, low power, high gain, low noise, microphone applications, low frequency

Cite this Article Richa Neog, Naushad Manzoor Laskar, Koushik Guha, Saurav Nath, K.L. Baishnab. Design of Low Power Preamplifier for Hearing Aid Applications. Journal of Advancements in Robotics. 2020; 7(1): 1–7p.