IR压降实时多点检测的两种方法

Two Methods for Real-Time and Multi-Spots IR Drop Detection

介绍了游标时数转换器(TDC)和循环时数转换器这两种用于实时多点检测电源网络IR压降的方案。游标TDC方案采用精调粗调结合的思想,在继承传统时数转换器方案高精度、单周期响应优点的基础上,对面积进行了优化。循环TDC方案采用倍频的思想,在继承单周期响应的环振(RO)方案小面积优点的基础上,对精度进行了优化。电路分别基于SMIC 28 nm高介电常数金属栅(HKMG)工艺进行仿真。仿真结果表明,与TDC方案相比,游标TDC方案在维持13.5 m V/bit高精度和单周期响应优点的同时,面积仅为163.75μm^2,减小了29%;而与同为单周期响应的环振方案相比,循环TDC方案维持92.25μm^2小面积优点的同时,精度达到40.5 m V/bit,提高了54%。

Two methods,vernier time-to-digital converter TDC and ring TDC,which are used for real-time multi-spots IR drop detection of the power network were presented. Combining of coarse and fine adjustment,vernier TDC inherited traditional TDC method＇s advantages of high precision and single clock cycle response time,and its area was optimized. Using the thought of frequency multiplication,ring TDC inherited single clock cycle responding ring oscillator（ RO） method＇s advantage of small area,and its precision was optimized. Circuits were simulated according to SMIC 28 nm HKMG process. The simulation results show that compared with TDC method,vernier TDC method keeps its advantages of high precision with 13. 5 mV / bit and single clock cycle response time. Besides, the area is only163. 75 μm^2which is reduced by 29%. Compared with single clock cycle responding ring oscillator method,ring TDC keeps its advantages of small area with 92. 25 μm^2,and the precision of ring TDC is40. 5 mV / bit which is enhanced by 54%.