Based Second Order ∑Δ Modulator for Digital Hearing Aid Applications

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• 作者：Rijo Sebastian^a ; ^{jyrijo@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Babita R. Jose^a ; Shahana T.K.^a ; Jimson Mathew^b
• 关键词：Genetic algorithm (GA) ; Sigma Delta Modulator (&sum ; ΔM) ; Signal-to-Noise Ratio (SNR)
• 刊名：Procedia Computer Science
• 出版年：2015
• 出版时间：2015
• 年：2015
• 卷：70
• 期：Complete
• 页码：274-281
• 全文大小：284 K

文摘

This paper describes the design and simulation of a sigma delta modulator (∑ΔM) architecture that can be used in digital hearing aid applications. A model of a non-ideal second order feed-forward ∑Δ Modulator, adopted for this purpose, is also presented. The loop coefficients of this architecture are optimized using Genetic Algorithm. The architecture together with optimized coefficients achieves 99 dB SNDR and a dynamic range of 101 dB. A sampling frequency (fs) of 1.28 MHz and a second order modulator makes this architecture less complex and power efficient.