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Step-by-Step: Selecting High Speed Rail-to-Rail Op Amps

机译：分步指南：选择高速轨到轨运算放大器

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摘要

Almost all PC and consumer electronics end equipment now consume increased amounts of power, a factor that has created demand for high speed op amps operating off split supplies into rail-to-rail op amps, which are becoming popular design choices - despite the fact that these devices do not actually reach either rail. When comparing different devices it is important to focus on the load that the end application will present to the device. For example, video applications typically require driving into a 150Ω load, while data acquisition applications are more in the order of 1k or 2k Ω. A rail-to-rail amp that is loaded less will swing closer to the rails. A spec of 100 mV to either rail for a heavily loaded amplifier currently is considered state-of-the-art. Without the benefit of split rail architecture, the output stage of these op amps is pressed to achieve exceptional AC performance, in terms of bandwidth and slew rate. The designer may be able to throw current at the output stage in an effort to increase the slew rate. But, as with most op amps, there is an optimal ground between power consumption and slew rate; increasing the current partially defeats the purpose of using a rail-to-rail op amp in the first place. A good measure that can be used as a proxy for the quality of an amplifier is the slew rate to power ratio.
机译：现在，几乎所有PC和消费类电子终端设备都消耗越来越多的功率，这是对高速运算放大器的需求，该运算放大器将分流电源转换成轨到轨运算放大器，这成为了流行的设计选择-尽管事实上，这些设备实际上没有到达任何一个轨道。在比较不同的设备时，重点放在最终应用程序将对设备造成的负载上很重要。例如，视频应用通常需要驱动到150Ω的负载，而数据采集应用则更多地处于1k或2kΩ的数量级。负载较小的轨到轨放大器将摆动得更靠近轨。目前，对于最重的放大器，任一电源轨的100 mV的规范被认为是最新技术。在没有分离式电源架构优势的情况下，这些运算放大器的输出级在带宽和压摆率方面都无法实现出色的交流性能。设计人员可能能够在输出级投入电流，以提高压摆率。但是，与大多数运算放大器一样，功耗和压摆率之间有一个最佳的平衡点。首先，增加电流会部分抵消使用轨到轨运算放大器的目的。可以作为放大器质量指标的一个很好的指标是压摆率与功率之比。

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