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首页> 外文期刊>IEEE Journal of Solid-State Circuits >A robust feedforward compensation scheme for multistage operational transconductance amplifiers with no Miller capacitors
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A robust feedforward compensation scheme for multistage operational transconductance amplifiers with no Miller capacitors

机译:无米勒电容器的多级运算跨导放大器的稳健前馈补偿方案

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摘要

A multistage operational transconductance amplifier with a feedforward compensation scheme which does not use Miller capacitors is introduced. The compensation scheme uses the positive phase shift of left-half-plane (LHP) zeroes caused by the feedforward path to cancel the negative phase shift of poles to achieve a good phase margin. A two-stage path increases further the low frequency gain while a feedforward single-stage amplifier makes the circuit faster. The amplifier bandwidth is not compromised by the absence of the traditional pole-splitting effect of Miller compensation, resulting in a high-gain wideband amplifier. The capacitors of a capacitive amplifier using the proposed techniques can be varied more than a decade without significant settling time degradation. Experimental results for a prototype fabricated in an AMI 0.5-/spl mu/m CMOS process show DC gain of around 90 dB and a 1% settling time of 15 ns for a load capacitor of 12 pF. The power supply used is /spl plusmn/1.25 V.
机译:介绍了一种不使用米勒电容器的具有前馈补偿方案的多级运算跨导放大器。补偿方案使用前馈路径引起的左半平面(LHP)零的正相移来抵消极点的负相移,以实现良好的相位裕度。两级路径进一步提高了低频增益,而前馈单级放大器使电路更快。缺少传统的米勒补偿极点分裂效应不会影响放大器的带宽,从而实现高增益宽带放大器。使用提出的技术的电容放大器的电容器可以变化十多年,而不会显着降低建立时间。以AMI 0.5- / spl mu / m CMOS工艺制造的原型的实验结果表明,对于12 pF的负载电容器,DC增益约为90 dB,建立时间的1%为15 ns。使用的电源为/ spl plusmn / 1.25V。

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