RSFQ/ERSFQ Cell Library With Improved Circuit Optimization, Timing Verification, and Test Characterization
RSFQ/ERSFQ Cell Library With Improved Circuit Optimization, Timing Verification, and Test Characterization
复制标题
RSFQ/ERSFQ 单元库具有改进的电路优化、时序验证和测试特性
DOI：
10.1109/tasc.2017.2677418
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发表时间：
2017
影响因子：
1.8
通讯作者：
A. Sahu
中科院分区：
文献类型：
--
作者：
A. Inamdar;D. Amparo;B. Sahoo;Jie Ren;A. Sahu
我们解决标准单元库的全部开发，包括仿真，布局和测试。我们提出了基于蒙特卡洛模拟和过程角的新电路分析方案。使用相位调制解码器作为示例电路，我们确定了最初针对参数边缘优化的设计中的弱点。为了支持非常高复杂性电路的静态计时分析，我们将图书馆单元格的定时表征描述为其负载的函数，并使用Verilog硬件描述性语言来证明数字定时验证，并通过定时验证。对于库单元格的布局，我们为MIT-LL，10 ka/cm2，SFQ4EE和SFQ5EE流程的双RSFQ/ERSFQ标准单元格库提供了架构。测试和表征数百个库单元，包括独特的单元格及其布局变化，是一个挑战。为了有效地表征数字细胞，我们开发了一种基于NDRO细胞的多路复用方案，该方案使我们能够在单个芯片上表征数百个单元。为了获得更好的模型与硬件相关性，我们使用环振荡器实现了差分延迟测量方案，从而促进了同步和异步细胞的时序表征。我们还报告了决策对的临界电流的统计变化的设计和测量。
We address all round development of the standard cell library including simulation, layout, and testing. We present a new circuit analysis scheme based on Monte-Carlo simulations and process corners. Using a phase modulation decoder as an example circuit, we identify weak spots in the design that was originally optimized for parameter margins. To support static timing analysis for very high complexity circuits, we describe the timing characterization of library cells as a function of its load, and demonstrate digital timing verification with timing back-annotation using Verilog hardware descriptive language. For the layout of library cells, we present architecture for the dual RSFQ/ERSFQ standard cell library for the MIT-LL, 10 kA/cm2, SFQ4EE and SFQ5EE processes. Testing and characterizing hundreds of library cells, including unique cells and their layout variations, is a challenge. For efficient characterization of the digital cells, we have developed an NDRO cell-based multiplexing scheme that lets us characterize hundreds of cells on a single chip. For better model-to-hardware correlation, we have implemented a differential delay measurement scheme using ring oscillators that facilitates timing characterization of the synchronous and asynchronous cells. We also report design and measurement of statistical variations for the critical current of decision-making pair of junctions.