A Modified Approach for CMOS Auto-Zeroed Offset-Stabilized Opamp

• 作者: Abouzar Taghizadeh Jafar Sobhi Ziaddin Daie Koozehkanani
• 来源期刊: 电路与系统(英文)
• 学科: 数学
• 关键词: Auto-Zeroing CHOPPING Offset-Stabilization OPAMP
• 年，卷（期）: 2013,（2）
• 页码范围: 193-201
• 页数: 9页
• 分类号: O1

摘要

In this paper, a very low-offset continuous time amplifier has been presented. It has the fully differential structure and uses an Auto-zeroed offset stabilization technique. This structure consists of two phases in which the offset value is sampled in the first phase and then subtracted from the signal in the second phase. In order to maintain the continuous time topology, the amplifier uses two paths called main-path and sub-path where the main-path is never disconnected from the signal path and as a result the structure will be continuous time. The amplifier is designed to have a total amount of power dissipation about 3 mW in the standard 0.35 μm CMOS process. Furthermore, the proposed Opamp has an offset value lower than 1 μV at a 2.5 kHz Auto-zeroing frequency, unity gain frequency of 6.14 MHz and phase margin of 78.6° with 50 pF loads.