Active feedback interference cancellation in RF receiver front-ends

Werth, Tobias D.; Schmits, Christoph; Heinen, Stefan

doi:10.1109/rfic.2009.5135562

Cited by 19 publications

(10 citation statements)

References 8 publications

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“…In comparison to [7] the noise figure is improved by 1.8 dB by an optimized input matching network. In particular, an inductive series-shunt (Ls-Lp) matching network has been used in [7] while the optimized case comprises an inductive shunt-series (Lp-Ls) matching network. In comparison, the gain is improved by about 1 dB due to a higher passive input resonance gain of the shunt-series matching network.…”

Section: B Blocking and Desensitizationmentioning

confidence: 94%

“…For low blocker levels the interference cancellation loop degrades the overall noise figure by about 0.2 dB. In comparison to [7] the noise figure is improved by 1.8 dB by an optimized input matching network. In particular, an inductive series-shunt (Ls-Lp) matching network has been used in [7] while the optimized case comprises an inductive shunt-series (Lp-Ls) matching network.…”

Section: B Blocking and Desensitizationmentioning

confidence: 95%

“…It has been shown that the feedback cancellation scheme is less sensitive to I/Q mismatch and less challenging in terms of mixer linearity than feedforward [6]. Therefore, focus of this work is a detailed assessment of the critical issues of active feedback interference cancellation in bandpass applications which has been demonstrated in [7]. Subsequently, the concept of feedback interference cancellation is introduced, the theory is derived and nonidealities like gain asymmetry, I/Q mismatch, and noise are discussed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Active Feedback Interference Cancellation Technique for Blocker Filtering in RF Receiver Front-Ends

Werth

Schmits

Wunderlich

et al. 2010

IEEE J. Solid-State Circuits

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A feedback interference cancellation circuit is presented that uses a control loop to reject blockers in wireless receivers. The concept is based on a feedback translational loop which subtracts a blocker replica from the original blocker signal. In contrast to feedforward methods loop selectivity does not depend on exact gain matching of two paths but on the open loop gain which is easier to adjust. The concept is described including the theoretical derivations of the transfer function and stability. Nonidealities like I/Q mismatch and noise mechanisms are discussed. Finally, measurements from a prototype chip in 65-nm CMOS are presented showing the feasibility of active feedback cancellation. In a desensitization scenario, gain drops by more than 12 dB for a 15 dBm blocker at 20 MHz offset without feedback interference cancellation while a gain degradation of merely 3 dB is measured with feedback interference cancellation enabled.

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Section: B Blocking and Desensitizationmentioning

confidence: 94%

Section: B Blocking and Desensitizationmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Active Feedback Interference Cancellation Technique for Blocker Filtering in RF Receiver Front-Ends

Werth

Schmits

Wunderlich

et al. 2010

IEEE J. Solid-State Circuits

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“…State of the art of interferer-cancellation systems [3] exhibits a common principle of translating in low frequencies the interferer. It is filtered, down converted, then re-injected in phase opposition at input of the receiver.…”

Section: A Spectrum Sensor To Cancel Interferersmentioning

confidence: 99%

“…Simulation MatLab 60dB VHDL-AMS Compensation directe 36,63dB VHDL-AMS correction auto-adaptative 60,2dB [3] 12dB [4] 27,2dB IV. CONCLUSION This paper presents the system validation of a Software Radio receiver with a wide-band rejection of interfering signals.…”

Section: Simulated System Rejectionmentioning

confidence: 99%

Wide-band rejection of interfering signals

Rivet

Fadhuile

Deval

et al. 2013

2013 IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS)

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A full software radio receiver is supposed to receive any signals in a wide band within a range from 0 to 5 GHz. But, linearity constraints are very strong because of all the nonidealities of such a complex system. Those non-idealities generate some undesired signals (interferers) leading to a degradation of reception. They can be counteracted by compensation. This paper proposes a mixed system of wide-band linearization consisting in an analog spectral sensor (SASP), a Digital Signal Processor (DSP) and an analog compensation signal generator. High-level simulation results in VHDL-AMS language exhibits a rejection of 60dB for continuous wave (CW) interferers.

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