Ka-band full duplex system with electrical balance duplexer for 5G applications using SiGe BiCMOS technology

The current dominating communication system is 4G. However, with the increase in the data rate and in the number of users in the world, the 4G communication system has started to saturate and couldn’t manage to keep up with user demands and there is less room for progress at 4G systems. In search of finding a system that covers the future interests of users, a new communication scheme is being processed as 5G. The next generation systems require wider bandwidth, high spectral efficiency, and less latency. For these goals, designs with higher frequency and full-duplex operation mode have been started to gain attention. Developments in SiGe HBT technologies -higher fT and fmax- make them suitable for these challenges. Considering these trends which lead to the future of communication systems, in this thesis the design of Ka-band (25-32GHz) SiGe full duplex system with electrical balance duplexer for 5G applications is presented. This system is created by integrating. a duplexer, an LNA, and a PA. The electrical balance duplexer is realized by a hybrid transformer and a balancing network. The impedance of the antenna is mimicked by tuning the balancing network to provide high isolation between transmitter and receiver blocks. All the ports have better than 10dB return loss. Duplexer provides measured 39dB peak isolation at 28GHz, with 3.8dB insertion loss from the transmitter to the antenna and 4.7dB insertion loss from the antenna to receiver. The LNA achieves the measured gain of 15dB, NF of 3.5dB and OP1dB of 13.5dBm at 28GHz by including an input and an output BALUN transformer. The PA provides measured gain of 17dB and OP1dB of 14dBm at 28GH

A 120GHz In-Band Full-Duplex PMF Transceiver with Tunable Electrical-Balance Duplexer in 40nm CMOS

© 2017 IEEE. A 120GHz in-band full-duplex PMF transceiver with tunable electrical-balance duplexer with on-chip antenna is implemented in a 40nm bulk CMOS technology. The self-interference (SI) cancellation is performed with a fully-differential transformer-based electrical-balance duplexer, resulting in a SI suppression of 30dB over a bandwidth of more than 14GHz. The insertion loss of the duplexer is less than 11dB from TX to fiber and less than 12dB from fiber to RX at a frequency of 120GHz. The balancing network impedance can tolerate load impedances from 45Ω to 93Ω and 38fF to 266fF at 120GHz. For in-band full-duplex operation, the maximum measured data rate is 6.2Gbps. The transceiver with integrated antenna occupies an area of 1.8mm × 1.53mm and has a DC power consumption of 73mW in total.status: publishe