A Dual Interference-Canceling Active Quasi-Circulator Achieving 36-dB Isolation Over 6-GHz Bandwidth

Tang, Bingjun; Gui, Xiaoyan; Xu, Jiangtao; Xia, Qing; Geng, Li

doi:10.1109/lmwc.2019.2910993

Cited by 12 publications

(10 citation statements)

References 7 publications

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“…Figure 10 depicts another WT circulator. 58 This structure is developed by employing the quasi-circulator in Reference 41. However, WT circulator in Reference 58 contains an extra identical circuit (denoted by red dotted lines in Figure 10) as shown in Reference 41.…”

Section: Wideband Tunable (Wt) Circulatormentioning

confidence: 99%

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Active quasi circulator: Comprehensive review and performance comparison

Hasan,

Chowdhury,

Zaman

2024

Engineering Reports

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Designing circulator as an antenna interface device becomes a daunting task, particularly active‐quasi circulator. This article focuses on demonstrating the basic operation principle, design methods, technical parameters, and performance metrics of active quasi‐circulator. In addition, the study provides an analogy of the circuits and structures proposed by the researchers to enhance certain performance metrics. Active signal cancellation and passive signal cancellation are identified as the major design approaches. Tunable, wideband, and wideband‐tunable are the major types of circulators found in existing literature. Moreover, this article provides a performance comparison of the active‐quasi circulators available in existing literature. Several active quasi‐circulators were able to operate in high frequencies such as 60 GHz with acceptable isolation levels. On the other hand, several designs have over 30 dB isolation, which is a highly desired parameter. At last, the future design challenges associated with active‐quasi circulators have been discussed to provide insight into future research.

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Section: Wideband Tunable (Wt) Circulatormentioning

confidence: 99%

“…Active circulators can be categorized into two major types: quasi‐circulator and conventional three‐way circulator 25 . By analyzing the existing literature in References 11,26–68, theory and operation principle of active‐quasi circulator is presented in the following sub‐sections.…”

Section: Theory and Principle Of Operationmentioning

confidence: 99%

Active quasi circulator: Comprehensive review and performance comparison

Hasan,

Chowdhury,

Zaman

2024

Engineering Reports

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“…The detailed circuit structure of this tunable active quasi-circulator is shown in Fig. 4(b) [4,23] . It is formed by connecting three single-stage distributed amplifiers (DAs) together with a T-network phase shifter.…”

Section: Tunable Architecturesmentioning

confidence: 99%

A survey of active quasi-circulators

Tang¹,

Geng²

2020

J. Semicond.

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With the development of multi-band wireless communication and the increasing data transmission rate, the circulator as an antenna interface must be able to work in multiple frequency bands and provides large bandwidth. It presents a high challenge to the design of circulators, especially the active quasi-circulators. In this survey, we review the representative active quasi-circulators and summarize three different techniques and the corresponding structures to show an incremental improvement of the isolation and bandwidth of the active quasi-circulators. In addition, we also compare the performance of several state-of-art active circulators, and analyze their advantages and disadvantages. Finally, we conclude the future trend of the active quasi-circulators.

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“…Traditionally, a circulator is implemented using ferrite materials, which are bulky, expensive, and incompatible with the integrated circuit (IC) fabrication process. On-chip active circulators [ 21 , 22 , 23 , 24 , 25 ] using transistors suffer from poor noise and linearity performance and a limited dynamic range [ 26 ]. Therefore, a non-magnetic non-reciprocal passive on-chip circulator is expected.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of a Non-Magnetic Bulk CMOS Passive Circulator Using 25% Duty-Cycle Clock

et al. 2022

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A circulator, which is a non-reciprocal device, is widely used in full-duplex systems, future communication and sensing networks, and quantum computing, and it is difficult to implement a passive topology on a chip. Based on switch-based spatio-temporal conductivity modulation, in this study, we design and implement a non-magnetic on-chip passive circulator operating at the Ku band in a 90-nm bulk CMOS technology using a 25% duty-cycle I/Q clock signal. With the virtue of the four-phase non-overlapping clock signal, the proposed circulator achieves a 3.9 dB transmitter (TX)-to-antenna (ANT) and a 4.0 dB ANT-to-receiver (RX) insertion loss with a 1-dB bandwidth of 2.7 GHz (21.4%). The TX-to-RX isolation is better than 17.2 dB, and the TX-to-ANT IIP3 and ANT-to-RX IIP3 are 19.7 dBm and 20.0 dBm, respectively, while occupying a die area of 1.55 mm × 1.15 mm. Although low-cost bulk CMOS technology is used, competitive isolation, linearity performance, and isolation bandwidth are achieved in the proposed design.

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A Dual Interference-Canceling Active Quasi-Circulator Achieving 36-dB Isolation Over 6-GHz Bandwidth

Cited by 12 publications

References 7 publications

Active quasi circulator: Comprehensive review and performance comparison

Active quasi circulator: Comprehensive review and performance comparison

A survey of active quasi-circulators

Analysis and Design of a Non-Magnetic Bulk CMOS Passive Circulator Using 25% Duty-Cycle Clock

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