Suppression of Constant Modulus Interference in Multimode Transceivers by Closed-Loop Tuning of a Nonlinear Circuit

Habibi, H.; Wu, Yan; Bergmans, J.W.M.; Janssen, Éric; Baltus, Peter

doi:10.1109/vetecs.2012.6240012

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…changes of the coupling between the aggressor and the victim. This procedure is described in more detail in [6], and will in future be extended to cases with varying envelopes. The remainder of this document will concentrate on the implementation and performance of the analog hardware that is mandatory for the NIS concept, namely the NIS circuit with the mixer followed by the low-pass filter.…”

Section: Application To Multi-radio Transceiversmentioning

confidence: 99%

Smart Self-interference Suppression by Exploiting a Nonlinearity

Janssen

Habibi

Milošević

et al. 2013

Frequency References, Power Management for SoC, and Smart Wireless Interfaces

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A 1.8GHz RF amplifier implemented in 0.14um CMOS with frequency-independent blocker suppression is presented. The blocker suppression functionality is obtained by the adaptation of a nonlinear input-output transfer according to the blocker amplitude. Since superposition does not apply to nonlinear transfer functions, the behavior of such a transfer for strong undesired signals is different from the behavior for weak desired signals, which is exploited here. In the presence of a 0 to +11 dBm RF blocker, a voltage gain for weak signals of respectively 7.6-9.4 dB and IIP3 >4 dBm are measured, while the blocker is suppressed by more than 35 dB. In case of no blocker present at the input, the circuit is set to amplifier mode providing 17 dB of voltage gain and an IIP3 of 6.6 dBm while consuming 3 mW. Application areas are coexistence in multi-radio devices and dealing with TX leakage in FDD systems.

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Section: Application To Multi-radio Transceiversmentioning

confidence: 99%

Smart Self-interference Suppression by Exploiting a Nonlinearity

Janssen

Habibi

Milošević

et al. 2013

Frequency References, Power Management for SoC, and Smart Wireless Interfaces

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“…2a). Furthermore, the gain of the small signal is derived [6] to be equal to G lin /2. So, by assuring at least 6dB gain in the linear amplifier, the small signal is amplified while simultaneously achieving large-signal suppression.…”

Section: A Large-signal Suppression and Small-signal Gainmentioning

confidence: 99%

“…changes of the coupling between the aggressor and the victim. In [6] this procedure is described in more detail, and will in future be extended to cases with varying envelopes. The subject of this work is indicated by the dashed box in Fig.…”

Section: B Application To Multi-radio Transceiversmentioning

confidence: 99%

A 1.8GHz amplifier with 39dB frequency-independent smart self-interference blocker suppression

Janssen

Milošević

Baltus

2012

2012 IEEE Radio Frequency Integrated Circuits Symposium

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This paper presents a 1.8GHz RF amplifier implemented in 140nm CMOS with frequency-independent blocker suppression. The functionality is obtained by adaptation of a nonlinear current transfer according to the blocker amplitude. In the presence of a 0 -11dBm RF blocker a voltage gain of 7.6 to 9.4dB and IIP 3 >4dBm are measured, while the blocker is suppressed by more than 39dB. In case of no blocker the circuit is set to amplifier mode providing 17dB of voltage gain, 8.4dB noise figure and IIP 3 of 6.6dBm while consuming 3mW. Application areas are coexistence in multiradio devices and dealing with TX leakage in FDD systems.

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