待机电源的挑战:唤醒接收器的救援

J. Rabaey
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引用次数: 3

摘要

许多现代多媒体组件和移动设备的平均功耗的很大一部分是在待机模式下花费的,扫描潜在的输入活动。降低“永远在线”器件的耗散对于实现绿色器件至关重要。常见的策略是对始终在线的组件进行责任循环。虽然实现起来很简单,但代价是延迟。提供低待机功耗和几乎零延迟的更有效方法是利用超低功耗唤醒接收器。将创新架构与最先进的CMOS和MEMS技术相结合,唤醒接收器在导通模式下的功耗低于50 uW。它们的可用性为待机电源管理打开了一个全新的视角。一方面,它们使绿色设备能够在纯粹的反应模式下运行,也就是说,它们只在输入活动发生时才打开。另一方面,它们允许对现有的通信协议(如WiFi和蓝牙)进行实质性的改进。在这次演讲中会提到一些例子。然而,从演示中得到的一个重要信息是,有效的待机电源管理需要一个系统视图,而目前面向组件的特殊方法很少有效。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The standby power challenge: Wake-up receivers to the rescue
A large fraction of the average power dissipation of many modern multimedia components and mobile devices is spent in standby mode, scanning for potential input activity. Reducing the dissipation of the “always-on” components is essential to the realization of green devices. The common strategy is to duty-cycle the always-on components. While simple to implement, it comes at the expense of latency. A more effective approach that delivers both low standby-power and almost-zero latency is to exploit ultra low-power wake-up receivers. Combining innovative architectures with state-of-the-art CMOS and MEMS technologies, wake-up receivers have been built that consume less than 50 uW in on-mode. Their availability opens a whole new perspective on standby power management. On one end of the spectrum, they enable green devices to operate in a purely reactive mode, that is they are only turned on when input activity happens. On the other side, they allow for substantial improvements in existing communication protocols such as WiFi and Bluetooth. A number of examples will be presented in the talk. One important message that will emerge from the presentation however is that effective standby power management requires a system vision, and that the ad-hoc component-oriented approach of today will rarely be effective.
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