A 750mW 24GS/s 12b Time-Interleaved ADC for Direct RF Sampling in Modern Wireless Systems
Sandeep Santhosh Kumar, Masahiro Kudo, Vlad Cretu, Antoine Morineau, Atsushi Matsuda, Minori Yoshida, Masazumi Marutani, Aadil Hussain Maniyar, Jay Kumar
Abstract
An ADC with a sampling rate of tens of GS/s and a high input bandwidth can greatly ease the design of wireless network systems. Such ADCs help in simplifying the analog front end design by relaxing the requirements for anti-alias and anti-image filtering. Having a bandwidth of up to 7.2GHz facilitates direct sampling on the 5G full FR1 band including LTE-U and WiFi 6/7 networks. However, the available state-of-the-art high-speed ADCs operating at 20GS/s or higher are designed mostly for wireline communications [5] and are not suitable for wireless base station applications where a high spectral dynamic range with an NSD of -147dBFS/Hz and an SFDR of 70dB are required to support 1024-QAM and higher modulations. The other high-resolution ADCs available in the range from 5-20GS/s [1–4] have higher power consumption, larger area and insufficient SFDR to be reliably used in the previously mentioned applications. The reported ADC achieves 24GS/s sampling rate with an input bandwidth of 7.2GHz as well as 76dB SFDR and -147.5dBFS/Hz NSD with high power efficiency and small area.