基于可控时序误差接受的低功耗数字滤波器设计

Ku He, A. Gerstlauer, M. Orshansky
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引用次数: 0

摘要

在信号处理应用中,可以通过接受输出信号质量的一些退化来获得较大的能量增益。过滤器是许多这类系统的核心。在本文中,我们展示了在数字滤波器设计中实现有利的质量-能量权衡的新范例的潜力,该范例基于在积极缩放VDD下直接接受数据路径中的时序误差。在未经修改的设计中,这种缩放导致计时误差的快速发生,从而导致质量损失。在改进的滤波器实现中,大错误的开始被延迟,允许在保持高质量的同时显著降低能量。具体来说,设计中的创新包括以下技术:1)运行时数据路径位宽的调整,以及2)设计时滤波器分岔的重新排序。我们在几个音频和图像处理应用程序中测试了新的设计策略。设计采用45nm标准细胞库合成。SPICE对整个设计的模拟结果表明,在保持良好的感知信噪比(SNRs)的同时,可以实现高达70%的节能。与传统的过滤器设计相比,我们的架构的面积开销约为2%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Low-energy digital filter design based on controlled timing error acceptance
In signal processing applications, large energy gains can be obtained by accepting some degradation in the output signal quality. Filters are at the core of many such systems. In this paper, we demonstrate the potential of a new paradigm for achieving favorable quality-energy trade-offs in digital filter design that is based on directly accepting timing errors in the datapath under aggressively scaled VDD. In an unmodified design, such scaling leads to rapid onset of timing errors and, consequently, quality loss. In a modified filter implementation, the onset of large errors is delayed, permitting significant energy reduction while maintaining high quality. Specifically, the innovations in the design include techniques for: 1) run-time adjustment of datapath bitwidth, and 2) design-time reordering of filter taps. We tested the new design strategy on several audio and image processing applications. The designs were synthesized using a 45nm standard cell library. Results of SPICE simulations on the entire designs show that up to 70% energy savings can be achieved while maintaining excellent perceived signal-to-noise ratios (SNRs). Compared to a traditional filter design, the area overhead of our architecture is about 2%.
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