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Analysis and Design of Fully Differential Gain-Boosted Op-amp for 14bit 100MS/s Pipelined Analog-to-Digital Converter

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3 Author(s)
Feng Wenxiao ; Beijing Microelectron. Technol. Inst., Beijing, China ; Lu Tiejun ; Wang Zongmin

This paper presents the analysis and design of high speed, high gain fully differential operational amplifier(op-amp). The op-amp is designed for sample and hold circuit of 14 bit 100 MS/s pipelined analog-to-digital converter (ADC). Both the main op-amp and the boosting op-amp are fully differential folded-cascode. The main op-amp has a switched capacitance common mode feedback circuit. The boosting op-amp is connected as a follower. The op-amp is designed in 0.18 mum CMOS process with 3.0 V power supply. Spectre simulation shows that the op-amp has the DC gain of 112 dB and the unity gain bandwidth of 1.15 GHz.

Published in:

INC, IMS and IDC, 2009. NCM '09. Fifth International Joint Conference on

Date of Conference:

25-27 Aug. 2009

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