A 0.68nW/kHz Supply-Independent Relaxation Oscillator with ±0.49%/V and 96ppm/°C Stability

📋 论文概要

提出了一种超低功耗的电源无关松弛振荡器，通过创新的电路设计实现了对电源电压和温度的高稳定性，解决了传统松弛振荡器频率易受电压和温度影响的问题。

💡 主要创新点

• 采用电源无关的偏置技术，使振荡器频率对电源电压变化不敏感，实现±0.49%/V的电压稳定性。
• 通过温度补偿电路将温度系数降低至96ppm/°C，同时保持极低的0.68nW/kHz功耗。
• 无需外部参考电压或复杂校准，实现紧凑、低成本的片上时钟源。

🏷 关键词

📄 原文摘要

are attractive for integrated clock sources compared to LC and ring oscillators (RO), as LC oscillators pose integration challenges and RO designs have limited voltage and temperature (V-T) stability. RxOs generate a clock whose time period (TP) depends only on the timing resistor (R) and capacitor (C). Ideally, TP is independent of V-T; however, most RxOs use a reference voltage (VREF) against which the voltage of C (Vc) is compared. Generating a V-T-independent VREF is non-trivial and causes variations in RxO frequency. A common approach is the use of VDD-independent current sources or band-gap or device-Vt-based VREF [1]. The former are generally high-power options [2] while the latter is subject to process and V-T variations. A correct-bydesign approach was adopted in [3] demonstrating VDD-independent operation

👥 作者与机构

Anand Savanth1,2, James Myers1, Alex Weddell2, David Flynn1,2, Bashir Al-Hashimi2

ARM, Cambridge, United Kingdom University of Southampton, Southampton, United Kingdom 1 2 RC Relaxation Oscillators (RxO)