Purpose

The purpose of this paper is to investigate a more robust ring oscillator. Less sensitivity to power supply variations is a target. This is important since low-quality ring oscillators could be exploited in numerous systems to reduce die costs.

Design/methodology/approach

The method in this work is large signal analysis. Delay time as the large signal parameter is calculated symbolically to explore dependency on a power supply voltage. Then simulations are performed to make a comparison. In this work, mathematical justifications are verified via HSPICE circuit simulator outputs, while 0.18 µm TSMC CMOS technology is exploited.

Findings

At least two combined configurations are presented with higher robustness. These circuits are more appropriate in noisy conditions. Both theoretical calculations and simulation results verify less sensitive oscillation against supply voltage ripples and temperature variations.

Originality/value

Introducing a band-switched inverter in combined configurations is contribution. In this way, three structures are presented which both show higher stability in oscillation frequency. The band switched delay time calculations are quite new and also the validity of the symbolical delay time approach is verified by circuit simulations.

中文翻译：

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高性能组合环形振荡器

目的

本文的目的是研究更鲁棒的环形振荡器。目标是降低对电源变化的敏感度。这很重要，因为在许多系统中都可以利用低质量的环形振荡器来降低芯片成本。

设计/方法/方法

这项工作中的方法是大信号分析。大信号参数的延迟时间是通过符号计算得出的，以探索对电源电压的依赖性。然后进行仿真以进行比较。在这项工作中，通过HSPICE电路仿真器输出验证了数学依据，同时利用了0.18 µm的TSMC CMOS技术。

发现

提出了至少两个组合的配置，具有更高的鲁棒性。这些电路在嘈杂的条件下更合适。理论计算和仿真结果均证明，对电源电压纹波和温度变化的敏感度较低。

创意/价值

在组合配置中引入带开关逆变器是一种贡献。以这种方式，提出了三种结构，它们均显示出更高的振荡频率稳定性。频带切换延迟时间的计算是非常新的，并且通过电路仿真也验证了符号延迟时间方法的有效性。