Fully Integrated 10-GHz Active Circulator and Quasi-Circulator Using Bridged-T Networks in Standard CMOS

Wang, Sen; Lee, Chih-Hsuan; Wu, Y.-J.

doi:10.1109/tvlsi.2016.2535377

Cited by 29 publications

(15 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this paper, a 3-port circulator model which can be analyzed by its scattering parameters easily is presented, and a low-power and highisolation active circulator is also proposed. Recently, a highisolation CMOS circulator using three bridged-T networks (BTNs) in a ring-configuration has been presented by using their notching frequency responses [8]. Figure 1 shows a 3-port unit cell and its scattering parameters.…”

Section: Introductionmentioning

confidence: 99%

A Compact Koch Fractal UWB MIMO Antenna With WLAN Band-Rejection

Tripathi

Mohan

Yadav

2015

Antennas Wirel. Propag. Lett.

220

166

View full text Add to dashboard Cite

In this letter, a compact octagonal shaped fractal ultrawideband multiple-input-multiple-output (MIMO) antenna is presented and its characteristics are investigated. In order to achieve the desired miniaturization and wideband phenomena, self-similar and space filling properties of Koch fractal geometry are used in the antenna design. These fractal monopoles are placed orthogonal to each other for good isolation. Moreover, grounded stubs are used in the geometry to provide further improvement in the isolation. The band rejection phenomenon in wireless local area network (WLAN) band is achieved by etching a C-shaped slot from the monopole of the antenna. The proposed antenna has compact dimensions of 45 mm × 45 mm and exhibits quasi-omnidirectional radiation pattern. In addition, it shows an impedance bandwidth (S 11 <-10dB) from 2-10.6 GHz with isolation better than 17dB over the entire UWB range. Diversity performance is also evaluated in terms of ECC and capacity loss. The measured results show good agreement with the simulated ones.

show abstract

Section: Introductionmentioning

confidence: 99%

A Compact Koch Fractal UWB MIMO Antenna With WLAN Band-Rejection

Tripathi

Mohan

Yadav

2015

Antennas Wirel. Propag. Lett.

220

166

View full text Add to dashboard Cite

show abstract

“…al. [18] at standard 0.18-µm CMOS technology. An active quasicirculator MMIC was designed and fabricated by Shin et.…”

Section: Circulator Basics and Advancementsmentioning

confidence: 99%

Simulation Analysis of MOSFET Based Absorber for Reflected RF Signal in 5G Massive MIMOBase Station

2020

IJETER

View full text Add to dashboard Cite

The reduce the effects of losses, due to the reflection of RF signals from the receiver (connected to circulators) in 5G massive MIMO base station, an N-channel MOSFET have been proposed as a solution. In the proposed model, theoretical relationships between drain current and source current of the Nchannel MOSFET have been used. Simulation experiment has been performed to verify the correctness in operation, consistency, and theoretical relationship between the sources and drain current. The experiment closely monitored the values of drain and source current at different reflection condition under appropriate gate voltage. To monitor these parameters, the peak voltage component of the reflected power at each chosen instance were calculated and its equivalent direct current voltage value was applied to the drain terminal of the MOSFET. This research focuses on examining the consistency of the parameters and theories used for the MOSFET based absorber under different reflection condition from ports of circulators in 5G base stations.

show abstract

“…The resulting devices are bulky, expensive, and incompatible with CMOS technologies 32 . The use of active devices to implement circulators has also been explored 33–35 . However, these implementations suffer from poor linearity and noise performance 36 .…”

Section: Introductionmentioning

confidence: 99%

A Generalized Model for Linear-Periodically-Time-Variant Circulators

Piazza

2019

Sci Rep

View full text Add to dashboard Cite

Magnetic-free non-reciprocity based on linear-periodically-time-variant (LPTV) circuits has received significant research and commercial attention since it could revolutionize wireless communications. LPTV circuits are formed by two main components: linear-time-invariant (LTI) networks and periodically-modulated switches. The modulated switches are the core elements to break the reciprocity of LTI networks. To understand and design LPTV circulators, a universal and intuitive analytical model is required. However, such model does not exist as it is extremely challenging to accurately model and fully understand the LPTV behaviour of energy storage networks. To address this limitation, this work introduces a novel analysis method, which is broadly applicable to any LPTV networks, and validates it experimentally. The novelty of this methodology comes from two main contributions: (1) modelling of the switch as a resistor in parallel with a current-controlled current source; (2) the decomposition of the LPTV network into the linear superposition of two LTI networks. We apply this technique to model the exact behaviour of an LPTV circulator in the frequency domain.

show abstract

Fully Integrated 10-GHz Active Circulator and Quasi-Circulator Using Bridged-T Networks in Standard CMOS

Cited by 29 publications

References 28 publications

A Compact Koch Fractal UWB MIMO Antenna With WLAN Band-Rejection

A Compact Koch Fractal UWB MIMO Antenna With WLAN Band-Rejection

Simulation Analysis of MOSFET Based Absorber for Reflected RF Signal in 5G Massive MIMOBase Station

A Generalized Model for Linear-Periodically-Time-Variant Circulators

Contact Info

Product

Resources

About