High Gain, Two-Stage, Fully Differential Audio Amplifier with 0.18μm CMOS Technology

Siavash Heydarzadeh^1, and Ramezan Ali Sadeghzadeh²

¹Faculty of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

²Faculty of Electrical and Computer Engineering, K. N. Toosi University of Technology, Tehran, Iran

Cite this paper:
Siavash Heydarzadeh and Ramezan Ali Sadeghzadeh. High Gain, Two-Stage, Fully Differential Audio Amplifier with 0.18μm CMOS Technology. American Journal of Electrical and Electronic Engineering. 2014; 2(1):6-10. doi: 10.12691/ajeee-2-1-2

Abstract

The two-stage, fully differential audio amplifier with 0.18μm CMOS technology and TSMC process is proposed. Telescopic amplifier created stage one and common emitter structure used to provide high gain in stage two. The amplifier has a ±1.2V differential output swing and a gain greater than 127dB while consuming power less than 10mW from 1.8V supply voltage. The step response of the audio amplifier is about 0.04us and the gain-bandwidth of the circuit is near 1.1GHz. Hspice software used to produce simulation results.

Keywords:
telescopic fully differential amplifier 0.18μ CMOS technology two-stage audio amplifier

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