A Tunable 5–7 GHz Distributed Active Quasi-Circulator With 18-dBm Output Power in CMOS SOI

Fang, Kelvin; Buckwalter, James F.

doi:10.1109/lmwc.2017.2750116

Cited by 22 publications

(19 citation statements)

References 10 publications

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“…When the signals from two paths meet at the resistor R, two paths of signals could be cancelled by each other. However, since the phase difference and the amplitude of the signals vary with the frequency after the signals pass through the in-phase path and the out-of-phase path, the common active quasi-circulator achieves high isolation within a limited bandwidth [21] .…”

Section: Active Quasi-circulators To Improve Isolation and Broaden Ba...mentioning

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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Section: Active Quasi-circulators To Improve Isolation and Broaden Ba...mentioning

confidence: 99%

A survey of active quasi-circulators

Tang¹,

Geng²

2020

J. Semicond.

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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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“…Active CMOS circulators have been explored in the frequency of interest [21], [22]; however, their noise performance has been shown to be insufficient.…”

Section: Introductionmentioning

confidence: 99%

A Wideband Low-Power Cryogenic CMOS Circulator for Quantum Applications

Ruffino

Peng

Foti

et al. 2020

IEEE J. Solid-State Circuits

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Quantum computers require classical electronics to ensure fault-tolerant operation. To address compactness and scalability, it was proposed to implement such electronics as integrated circuits operating at cryogenic temperatures close to those at which quantum bits (qubits) operate. Circulators are among the most common blocks used in the qubit readout chain, but they are currently discrete devices with a bulky footprint, thus preventing large-scale system integration. For this reason, we present here a detailed description of the first fully integrated CMOS circulator operating from 300 K down to 4.2 K to be an integral part of cryogenic quantum computing platforms. At 300 K, the circuit's operating frequency is centered around 6.5 GHz with 28% fractional bandwidth, and it has 2.2-dB insertion loss, 2.4-dB noise figure, and 18-dB isolation while consuming 2.5-mW core power. These results are achieved thanks to a fully passive architecture based on LC all-pass filters, which allows achieving a 1.6× increase in fractional bandwidth and the lowest power consumption with respect to the state of the art while using only 0.45 mm 2 of core area. This allows miniaturization of circulators in power-constrained multi-qubit readout systems.

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A Tunable 5–7 GHz Distributed Active Quasi-Circulator With 18-dBm Output Power in CMOS SOI

Cited by 22 publications

References 10 publications

A survey of active quasi-circulators

A survey of active quasi-circulators

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

A Wideband Low-Power Cryogenic CMOS Circulator for Quantum Applications

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