20.2 A 57nW Software-Defined Always-On Wake-Up Chip for IoT Devices with Asynchronous Pipelined Event-Driven Architecture and Time-Shielding Level-Crossing ADC. - Zhixuan Wang; Le Ye; Hao Zhanq; Jiayoon Ru; Haitao Fan; Yangyuan Wang; Ru Huang 001 (ISSCC, 2020)