March 8, 2013
Interschool Lab (750 CEPSR)
Hosted by: Columbia Integrated System Laboratory
Speaker: Dr. Junhua Shen (Analog Devices)
Analog-to-digital converters are ubiquitous in today's information era, from cell phones, cameras, to cars and industrial equipment. Successive approximation registers (SAR) ADCs are unique among various types of ADCs in that they are power efficient, small and have very low latency. On the other hand, SAR ADCs are inherently slower than some other types of ADCs, like pipeline and flash, due to its sequential bit-trial nature for each conversion. As such, SAR ADCs mainly find applications in lower than 10Msps space. This talk will be divided into two sections. In the first section, an 80Msps, 14-bit SAR ADC will be presented, with highlights of several ideas which enabled the high speed and high resolution operation. In the second section, the design will be used as an engineering case study to show the technical journey of pushing the state-of-the-art of SAR ADCs.
Junhua Shen received his B.Eng. from Zhejiang University in Hangzhou, China, in 2002. He continued his study at The Chinese University of Hong Kong and Columbia University, where he earned his M.Phil. and Ph.D. respectively. His master's thesis focused on high image-rejection continuous-time sigma-delta modulator, while his PhD research was mainly on ultra-low-voltage and low-power pipelined ADCs. In Feb. 2010, he joined Analog Devices in Wilmington, MA as a senior design engineer, where he has been working on high speed, high resolution SAR ADCs and digital imaging related products. His interests are in analog-to-digital converters and system level solutions that involve ADCs.