Topic：A 300-GHz 52-mW CMOS Receiver with On-Chip LO Generation
Speaker：Prof. Behzad Razavi(University of California, Los Angeles)
Abstract：
The 300-GHz band holds great potential for high-speed data communication.With the creation of the IEEE 802.15.3d standard in 2017 for radios operating inthe unlicensed frequency band from 252 GHz to 322 GHz, there is nowheightened interest in developing terahertz transceivers. Moreover, a number ofresearchers have demonstrated the viability of such radios in CMOS technology,portraying a promising future. These examples consume between 140 mW and650 mW and employ off-chiplocal oscillators (LOs). In this presentation, we contend that the feasibility of terahertz datacommunication radios hinges upon their power consumption. We then present afully-integrated receiver that employs a heterodyne architecture with 270-GHzand 30-GHz local oscillators to alleviate phase mismatch issues. The systemincorporates three on-chip phase-locked loops to generate the LO phases forboth downconversions. Realized in 28-nm CMOS technology, the prototypeexhibits a noise figure of 16-20 dB, a gain of 17-21 dB, and a 1-dB compressionpoint of -17.3 dBm. The phase noise of the 270-GHz PLL is -105 dBc/Hz at 10-MHz offset, amounting to an integrated jitter of 106 fs from 10 kHz to 10 MHz.The compact design occupies an active area of 0.06 mm2.
Topic：Sub-Terahertz Scalable Phased Array System-in-Package (SiP)
Speaker：Prof. Tian-Wei Huang (NTU,Taiwan)
Abstract：
We have successfully developed scalable TRx phased-array modules at 38 GHz,we will use 3-D System-in-Package (SiP) to miniaturize our module size for subterahertz applications, like 140-GHz/300-GHz communication links. Comparedwith our scalable (vertical) array, the traditional planar array has a signal routingchallenge, especially for 1024 elements or more. The 3-D vertical signal routingcan mitigate the complex array routing challenges. Our sub-terahertz phased-array will have hybrid optical-electrical transceiverswith optical sub-terahertz signal generations. The fusion of optical fibertransmission with sub-terahertz wireless links can overcome the range limitationof free space path loss over 100 GHz. We will also develop sub-terahertz IQ subharmonic mixers, LO multipliers and phase shifters, and sub-terahertz PAs/LNAsfor sub-terahertz phased-array electrical transceivers.