List of Articles تقویت کننده پارامتریک Open Access Article Abstract Page Full-Text 1 - Design and Simulation of Fourth Order Sigma-Delta Modulator using Parametric Amplifier with Dynamic Threshold for Digital Hearing Aid Application Shima Alizadeh Zanjani Abumoslem Jannesari Pooya Torkzadeh 10.30495/jce.2023.1983365.1198