A 210-GHz Magnetless Nonreciprocal Isolator in 130-nm SiGe BiCMOS Based on Resistor-Free Unidirectional Ring Resonators

Nonreciprocal components such as circulators, isolators, and gyrators play vital roles in modern communication systems. However, all of them are limited to 0.1 terahertz (THz) due to their poor performances in terms of linearity, loss, and noise at high frequency, making them not amenable for the po...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2020-05, Vol.30 (5), p.524-527
Main Authors: Wang, Yunfan, Chen, Wenhua, Li, Xingcun
Format: Article
Language:English
Subjects:
Circulator
Communications systems
Gyrators
Isolators
Linearity
Noise levels
Noise measurement
nonreciprocity
Optical ring resonators
Resonant frequency
Resonators
Silicon germanides
Silicon germanium
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Summary:Nonreciprocal components such as circulators, isolators, and gyrators play vital roles in modern communication systems. However, all of them are limited to 0.1 terahertz (THz) due to their poor performances in terms of linearity, loss, and noise at high frequency, making them not amenable for the potential sub-THz/THz operation. In this letter, a 210-GHz nonreciprocal isolator based on the resistor-free unidirectional ring resonators is implemented in a 130-nm SiGe BiCMOS process ( f_{T}/f_{\mathrm {max}} = 300 /500 GHz). Thanks to the proposed resistor-free ring resonators, the isolator achieves 1.40-dB loss, 6.7-dB noise figure (NF)/unit, 21.2-dB isolation, and superior linearity. Even compared with the nonreciprocal components operating at a much lower frequency, this structure also exhibits a good performance.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2020.2985865