Abstract

An integrated reconfigurable CMOS quasi-circulator operating at 2.4 GHz is presented. A passive structure delivers transmit power amplifier (PA) output signal to the differential low-noise amplifier (LNA) input as a common-mode signal and simultaneously delivers received signal as a differential-mode signal at the LNA input. The leakage of the PA output signal at the LNA input is reduced in two steps. First, the use of a reconfigurable impedance matching circuit, instead of a fixed 50-Ω resistance reduces the leakage by compensating the antenna impedance mismatch, and improves transmitter-receiver isolation. Second, a reconfigurable summing stage adds amplitude and phase adjusted PA output signal to LNA output to cancel the residual PA output leakage. Measurement results show that the receiver achieves a reduction of 90 dB for a single tone and more than 50 dB for a QPSK modulated 40-MHz bandwidth transmit signal. The receiver gain is more than 10 dB and the noise figure in the receiver path is 4.5 dB. The reconfigurable quasi-circulator along with the receiver LNA is designed and fabricated on a 130-nm CMOS technology. The cancellation circuitry occupies 0.27 mm² and consumes 30-mW quiescent power, while the total active area of the chip is 1 mm², and it consumes 65-mW power.

Original languageEnglish (US)
JournalIEEE Transactions on Microwave Theory and Techniques
DOIs
StateAccepted/In press - Dec 2 2017

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Low noise amplifiers
transmitter receivers
Transceivers
cancellation
leakage
Power amplifiers
low noise
power amplifiers
amplifiers
receivers
output
Differential amplifiers
CMOS
Quadrature phase shift keying
Noise figure
quadrature phase shift keying
impedance matching
Antennas
Bandwidth
isolation

Keywords

  • Circulators
  • Full-duplex wireless
  • Impedance
  • impedance tuner
  • on-chip circulator
  • Receivers
  • reconfigurable circuit
  • self-interference cancellation
  • System-on-chip
  • transmit leakage cancellation.
  • Transmitting antennas

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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title = "Integrated Quasi-Circulator With RF Leakage Cancellation for Full-Duplex Wireless Transceivers",
abstract = "An integrated reconfigurable CMOS quasi-circulator operating at 2.4 GHz is presented. A passive structure delivers transmit power amplifier (PA) output signal to the differential low-noise amplifier (LNA) input as a common-mode signal and simultaneously delivers received signal as a differential-mode signal at the LNA input. The leakage of the PA output signal at the LNA input is reduced in two steps. First, the use of a reconfigurable impedance matching circuit, instead of a fixed 50-Ω resistance reduces the leakage by compensating the antenna impedance mismatch, and improves transmitter-receiver isolation. Second, a reconfigurable summing stage adds amplitude and phase adjusted PA output signal to LNA output to cancel the residual PA output leakage. Measurement results show that the receiver achieves a reduction of 90 dB for a single tone and more than 50 dB for a QPSK modulated 40-MHz bandwidth transmit signal. The receiver gain is more than 10 dB and the noise figure in the receiver path is 4.5 dB. The reconfigurable quasi-circulator along with the receiver LNA is designed and fabricated on a 130-nm CMOS technology. The cancellation circuitry occupies 0.27 mm² and consumes 30-mW quiescent power, while the total active area of the chip is 1 mm², and it consumes 65-mW power.",
keywords = "Circulators, Full-duplex wireless, Impedance, impedance tuner, on-chip circulator, Receivers, reconfigurable circuit, self-interference cancellation, System-on-chip, transmit leakage cancellation., Transmitting antennas",
author = "Ayati, {Seyyed Amir} and Debashis Mandal and Bertan Bakkaloglu and Sayfe Kiaei",
year = "2017",
month = "12",
day = "2",
doi = "10.1109/TMTT.2017.2773485",
language = "English (US)",
journal = "IEEE Transactions on Microwave Theory and Techniques",
issn = "0018-9480",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - Integrated Quasi-Circulator With RF Leakage Cancellation for Full-Duplex Wireless Transceivers

AU - Ayati, Seyyed Amir

AU - Mandal, Debashis

AU - Bakkaloglu, Bertan

AU - Kiaei, Sayfe

PY - 2017/12/2

Y1 - 2017/12/2

N2 - An integrated reconfigurable CMOS quasi-circulator operating at 2.4 GHz is presented. A passive structure delivers transmit power amplifier (PA) output signal to the differential low-noise amplifier (LNA) input as a common-mode signal and simultaneously delivers received signal as a differential-mode signal at the LNA input. The leakage of the PA output signal at the LNA input is reduced in two steps. First, the use of a reconfigurable impedance matching circuit, instead of a fixed 50-Ω resistance reduces the leakage by compensating the antenna impedance mismatch, and improves transmitter-receiver isolation. Second, a reconfigurable summing stage adds amplitude and phase adjusted PA output signal to LNA output to cancel the residual PA output leakage. Measurement results show that the receiver achieves a reduction of 90 dB for a single tone and more than 50 dB for a QPSK modulated 40-MHz bandwidth transmit signal. The receiver gain is more than 10 dB and the noise figure in the receiver path is 4.5 dB. The reconfigurable quasi-circulator along with the receiver LNA is designed and fabricated on a 130-nm CMOS technology. The cancellation circuitry occupies 0.27 mm² and consumes 30-mW quiescent power, while the total active area of the chip is 1 mm², and it consumes 65-mW power.

AB - An integrated reconfigurable CMOS quasi-circulator operating at 2.4 GHz is presented. A passive structure delivers transmit power amplifier (PA) output signal to the differential low-noise amplifier (LNA) input as a common-mode signal and simultaneously delivers received signal as a differential-mode signal at the LNA input. The leakage of the PA output signal at the LNA input is reduced in two steps. First, the use of a reconfigurable impedance matching circuit, instead of a fixed 50-Ω resistance reduces the leakage by compensating the antenna impedance mismatch, and improves transmitter-receiver isolation. Second, a reconfigurable summing stage adds amplitude and phase adjusted PA output signal to LNA output to cancel the residual PA output leakage. Measurement results show that the receiver achieves a reduction of 90 dB for a single tone and more than 50 dB for a QPSK modulated 40-MHz bandwidth transmit signal. The receiver gain is more than 10 dB and the noise figure in the receiver path is 4.5 dB. The reconfigurable quasi-circulator along with the receiver LNA is designed and fabricated on a 130-nm CMOS technology. The cancellation circuitry occupies 0.27 mm² and consumes 30-mW quiescent power, while the total active area of the chip is 1 mm², and it consumes 65-mW power.

KW - Circulators

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KW - System-on-chip

KW - transmit leakage cancellation.

KW - Transmitting antennas

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