A folded cascode OTA using current-mode gain-boost amplifier

Ma Lei, Ding Ying-tao, Wang Xing-hua
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引用次数: 4

Abstract

In this report, an OTA which is used in fully differential pipelined ADC was described. Using gain-boost architecture with current-mode single-ended amplifier, this OTA reduce parasitic taking by gain-boost amplifier to achieve high-gain and high-speed. Besides, a dual phase SC-CMFB circuit is introduced, and some methods are concerned to improve the performance. Then, by optimization the layout design, OTA's mismatch was reduced. This design was using SMIC 0.35um CMOS process and simulation both schematic and layout in Cadence. The result of the simulation shows that the OTA has a gain up to 105dB, a unity gain bandwidth of about 937MHz for a 2pF load, a settling time of about 4.4ns, a Common-Mode Range is 0.6V∼3.3V, a output swing is 0.6V∼3.1V, with the power supply of 3.3V, the dissipation is 39mW. This amplifier was used in a 10bit 100MHz pipelined ADC.
采用电流型增益-升压放大器的折叠级联码OTA
本文介绍了一种用于全差分流水线ADC的OTA。该OTA采用增益-升压结构和电流型单端放大器,减少增益-升压放大器的寄生占用,实现高增益和高速。此外,还介绍了一种双相SC-CMFB电路,并提出了一些改进电路性能的方法。然后,通过优化布局设计,减少OTA的错配。本设计采用中芯0.35um CMOS工艺,并在Cadence中对原理图和版图进行仿真。仿真结果表明,在2pF负载下,OTA的增益可达105dB,单位增益带宽约为937MHz,稳定时间约4.4ns,共模范围为0.6V ~ 3.3V,输出摆幅为0.6V ~ 3.1V,电源为3.3V,功耗为39mW。该放大器用于一个10位100MHz的流水线ADC。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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