A 0.55-to-0.9GHz 2.7dB NF full-duplex hybrid-coupler circulator with 56MHz 40dB TX SI suppression

Jain, Sanket; Agrawal, Abhishek; Johnson, Manoj; Natarajan, Arun

doi:10.1109/isscc.2018.8310353

Cited by 20 publications

(22 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar architectures of switched-transmission lines have been implemented in gallium nitride (GaN) technologies to realize ultra-wideband circulators [32]. By replacing the 3λ/4 transmission line around the N-path filter with a hybrid coupler, a circulator-receiver with enhanced bandwidth has been realized in [33]. This architecture has been shown to provide >30 dB isolation across 190 MHz bandwidth for a wide range of antenna impedances up to a VSWR of 1.35 without an on-chip balancing network.…”

Section: B Integrated Circulatorsmentioning

confidence: 99%

A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

Chen

Garikapati

Nagulu

et al. 2021

IEEE Open J. Commun. Soc.

View full text Add to dashboard Cite

Full-duplex (FD) wireless -simultaneous transmission and reception on the same frequency -is a promising technique that can significantly improve spectrum efficiency and reduce communication latency in future wireless networks. To enable FD operation, the powerful self-interference (SI) signal leaking from the transmitter (TX) into the receiver (RX) needs to be suppressed and canceled to an extreme degree at the antenna interface as well as in the RF/analog and digital domains. Various approaches to achieve TX-RX isolation at the antenna interface and SI cancellation (SIC) in the RF/analog and digital domains have been demonstrated, with a focus on using bench-top off-the-shelf components. Recent advances in integrated circuit (IC) implementations of various types of shared antenna interfaces and cancellers in the RF and/or analog baseband (BB) domains have further pushed the frontier of realizing FD wireless in small-form-factor/hand-held devices. Moreover, it is still important to fundamentally study the SIC performance that can be achieved by different types of cancellers. In this paper, we present a first-of-its-kind comprehensive overview on the implementation and comparison of various state-of-theart integrated shared antenna interfaces and SI cancellers in both the RF and analog BB domains. We define two figures of merit (FOM) for the IC-based shared antenna interfaces and SI cancellers, which capture various design considerations and performance tradeoffs including the achievable isolation/SIC, bandwidth, noise figure degradation, TX/SI power handling, and power consumption. In particular, we focus on two types of integrated shared antenna interfaces including electrical-balance duplexers and circulators. We also discuss two types of SI cancellers based on the time-domain and frequency-domain approaches, which respectively employ parallel delay lines and bandpass filters to emulate the SI channel. Based on realistic measurements, we perform extensive numerical evaluations to illustrate and compare the achievable RF SIC performance in different scenarios, as well as discuss various design tradeoffs. Finally, we provide an overview of the IC-based implementations and performance evaluations of both types of cancellers based on our recent work. INDEX TERMS Full-duplex wireless, integrated circuit (IC), antenna interface, self-interference cancellation, systems and testbeds. TINGJUN CHEN (Member, IEEE) received the B.Eng. degree in electronic engineering from Tsinghua University in 2014, and the Ph.D. degree in electrical engineering from Columbia University in 2020. He is an Assistant Professor with the Department of Electrical and Computer Engineering, Duke University and was a Postdoctoral Associate with Yale University from 2020 to 2021. His research interests are in the area of networking and communications with a specific focus on next-generation wireless networks and Internet-of-Things systems.

show abstract

Section: B Integrated Circulatorsmentioning

confidence: 99%

A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

Chen

Garikapati

Nagulu

et al. 2021

IEEE Open J. Commun. Soc.

View full text Add to dashboard Cite

show abstract

“…It was also shown that by placing the gyrator right next to one of the ports (say port 3, connected to a sensitive receiver), the voltage swing associated with an excitation at port 1 (connected to a high-power transmitter) can be greatly suppressed across the gyrator switches due the isolation of the circulator, thereby enhancing the power handling of the circulator for excitations at port 1. Later, the embedding of the phase shifted N-path filter into a hybridcoupler to enhance the bandwidth was also explored [65].…”

Section: Conductivity Modulationmentioning

confidence: 99%

Non-Magnetic Non-Reciprocal Microwave Components — State of the Art and Future Directions

Nagulu

Krishnaswamy

2021

IEEE J. Microw.

View full text Add to dashboard Cite

“…Several SIC architectures have been proposed in prior work to enable simultaneous transmit and receive (STAR) at RF and mm-wave. STAR operation with non-reciprocal on-chip circulators using N-path mixers were proposed at RF frequencies in [22] with subsequent works focused on increasing bandwidth, increased power handling and MIMO operation [14], [19], [20], [23]- [25]. Shared-antenna interfaces based on electrical-balance duplexers (EBD) have also been demonstrated at RF in [18], [26]- [30].…”

Section: Introductionmentioning

confidence: 99%

Wideband, Millimeter Wave Domain SI Canceling (>50dB) In-Band Full-Duplex Circulator Receiver

2022

View full text Add to dashboard Cite

This paper describes a 26-GHz fully integrated In-band Full-duplex Circulator (IBFD) Receiver (RX), which employs passive and active Self-interference Cancellation (SIC) techniques in the mm-wave domain. Coverage of wireless networks at mm-wave frequencies can be enhanced by deploying a large number of base stations economically based on Integrated Access and Backhaul (IAB) relays and repeaters. However, to retain the channel capacity, IAB needs to be implemented using full-duplex schemes that suffer from a strong Transmitter (TX) to RX SI. This SI leakage can significantly impact the receiver sensitivity and increase the baseband/ADC dynamic range requirements. Canceling SI at mm-wave applications is particularly challenging given the high frequency of operation, wide bandwidth, and antenna (ANT) impedance sensitivity to the surroundings. Proposed mm-wave RX with a shared ANT interface based on a circulator with active SI cancelers provide ∼53 dB SIC over 400 MHz and ∼40 dB SIC over 400 MHz in mm-wave domain to meet the link budget requirements. Proposed architecture achieves SIC by (i) introducing a shared ANT interface based on a hybrid-coupler and a non-reciprocal delay line that provides wideband SIC and additionally creates a SI replica (ii) subsequent active cancellation using SI replica processed with variable gain amplifiers and phase shifters. This system also accommodates SI channel variations due to surroundings. Proposed 26-GHz circulator RX has >100x better SIC at high TX power (>10 dBm) levels in comparison to the state-of-the-art and it consumes ∼111 mW power. The system is implemented in 45nm SOI CMOS and has an active area of 4.54 mm 2 . Stand-alone RX NF is ∼5.8 dB and TX to ANT insertion loss (IL) is ∼3.1 dB. Over-the-air measurements with modulated TX (128 QAM 2.1 Gb/s) and RX (128 QAM 4.2 Gb/s) signals show an EVM of 3.3%.

show abstract

A 0.55-to-0.9GHz 2.7dB NF full-duplex hybrid-coupler circulator with 56MHz 40dB TX SI suppression

Cited by 20 publications

References 5 publications

A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

Non-Magnetic Non-Reciprocal Microwave Components — State of the Art and Future Directions

Wideband, Millimeter Wave Domain SI Canceling (>50dB) In-Band Full-Duplex Circulator Receiver

Contact Info

Product

Resources

About