Digital Adaptive IIP2 Calibration Scheme for CMOS Downconversion Mixers

Dufrene, Krzysztof; Boos, Z.; Weigel, Robert

doi:10.1109/jssc.2008.2005453

Cited by 42 publications

(22 citation statements)

References 25 publications

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“…A digital technique for tuning of the mixer core is provided in [21]. A digital adaptive calibration method without test tones is presented in [22]. In [1] a double balanced Gilbert mixer is presented using pseudorandom test signal mixer inputs for generation of optimum mixer biasing for IP 2 suppression.…”

Section: Previous Ip 2 Enhancement Techniquesmentioning

confidence: 99%

A BiCMOS single ended multiband RF-amplifier and mixer with DC-offset and second order distortion suppression

Tired

2011

Analog Integr Circ Sig Process

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Direct conversion receivers are widely used for full duplex mobile radio communication systems. This paper describes a novel SAW-less single-ended RF amplifier connected to a single-ended mixer with a feedback loop that suppresses the second-order distortion from TX cross modulation of the LO-leakage as well as DCoffset at the mixer output. In Monte Carlo simulations the design achieves ?47 dBm minimum IIP 2 with 32 dB conversion voltage gain. The advantage with the proposed architecture is that it is fully single-ended. Especially in multiband integrated radios this is highly desirable since the pin-count for the LNAs is reduced by half. The PCB routing of the RF input signal is simplified. The design requires two off-chip filter capacitors of non critical value intended to be placed on the laminate inside the package.

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Section: Previous Ip 2 Enhancement Techniquesmentioning

confidence: 99%

A BiCMOS single ended multiband RF-amplifier and mixer with DC-offset and second order distortion suppression

Tired

2011

Analog Integr Circ Sig Process

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“…Third-order linearization approaches include cancellation of non-linearities in digital front-end [29], locally at RF [2], [28], [30] or using alternate path to process third-order components [31]. Similarly, second-order linearization can be divided into robust local linearity boosting techniques [32], [33] as well as to different calibration schemes [11], [34]. This can be interpreted that to be competitive receiver architecture must either provide inherently highly linear structure against out-of-band interferers or means to calibrate or cancel out any large interferer or resulted non-linearity product over a wide band of possible frequencies.…”

Section: A Receiver Architectures For Portable Devicesmentioning

confidence: 99%

A 900-MHz Direct Delta-Sigma Receiver in 65-nm CMOS

Koli

Kallioinen

Jussila

et al. 2010

IEEE J. Solid-State Circuits

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Direct delta-sigma receiver architecture is introduced for wireless communication systems, such as LTE or WiMax. Architecture is based on direct downconversion, delta-sigma feedback that is up-converted to RF, and N-path filtering technique. Hence, the core receiver functions including channel selection filtering are embedded to a RF ADC with excellent linearity performance. This is achieved by transforming narrow-band filtering partially to RF injecting feedback into the input of the second amplifier stage, hence relieving requirements of the most critical subsequent stages. A 900-MHz direct delta-sigma receiver prototype occupies an active area of 1 2 mm 2 in 65-nm CMOS. The receiver for low-band cellular operations achieves NF of 2.3 and 6.2 dB in conventional and delta-sigma modes, respectively, and out-of-band IIP3 up to +4 dBm when the delta-sigma loop is active. The chip consumes 80 mW from a 1.2-V supply.

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“…In a similar manner, also circuits can be calibrated to reduce distortions. In [26], an example of such calibration technique is presented. Here the calibration is performed on the input-referred second-order intercept point (IIP2), which is a crucial parameter both, in wideband direct-conversion and low-IF receivers.…”

Section: B Dsp-enabled Hybrid Calibration Principlesmentioning

confidence: 99%

“…As even with careful circuit design and symmetric layout, some asymmetries and mismatches remain and thus IIP2 calibration can improve the situation considerably. The approach of [26] is to estimate the second-order distortion of the downconversion mixer in a simple DSP block (including basically an LMS algorithm) and use this information to tune the IIP2 performance of the mixer by introducing intentional mismatches in a way that this cancels the intrinsic mismatches. It has been shown, that this approach can improve the IIP2 performance by up to 16 dB.…”

Section: B Dsp-enabled Hybrid Calibration Principlesmentioning

confidence: 99%

Digital signal processing for reducing the effects of RF imperfections in radio devices — An overview

Valkama

Springer

Hueber³

2010

Proceedings of 2010 IEEE International Symposium on Circuits and Systems

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Building compact and low-cost yet flexible and reconfigurable radios for future wireless systems is generally a challenging task. On one hand, the needs for flexibility and re-configurability prevent using dedicated hardware particularly designed and optimized for only a single application or part of the radio spectrum. And on the other hand, to keep the overall size and cost of the radio equipment feasible, especially in multi-antenna multi-radio scenarios, the cost and size of individual radios are strongly limited. As a result, various imperfections and impairments are expected to take place in the used radio transceivers, especially in the radio frequency (RF) analog electronics. Good examples of such imperfections are, e.g., mirror-frequency interference due to I/Q imbalance, non-linear distortion due to mixer and amplifier nonlinearities, timing jitter and non-linearities in sampling and analog-to-digital (A/D) converter circuits, and oscillator phase noise. These impairments, if not properly understood and taken into account, can easily become a limiting factor to the quality and performance of the radio device and thereon of the whole wireless link. This is even more so, when more complex and more sensitive high-order modulated wideband communications waveforms are being deployed in the future systems. This article gives an overview of the essential RF impairments in modern radio communication context. Furthermore, different conceptual alternatives for reducing the effects of RF impairments in radio transmitters and receivers utilizing digital signal processing are described.

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Digital Adaptive IIP2 Calibration Scheme for CMOS Downconversion Mixers

Cited by 42 publications

References 25 publications

A BiCMOS single ended multiband RF-amplifier and mixer with DC-offset and second order distortion suppression

A BiCMOS single ended multiband RF-amplifier and mixer with DC-offset and second order distortion suppression

A 900-MHz Direct Delta-Sigma Receiver in 65-nm CMOS

Digital signal processing for reducing the effects of RF imperfections in radio devices — An overview

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Digital Adaptive IIP2 Calibration Scheme for CMOS Downconversion Mixers

Cited by 42 publications

References 25 publications

A BiCMOS single ended multiband RF-amplifier and mixer with DC-offset and second order distortion suppression

A BiCMOS single ended multiband RF-amplifier and mixer with DC-offset and second order distortion suppression

A 900-MHz Direct Delta-Sigma Receiver in 65-nm CMOS

Digital signal processing for reducing the effects of RF imperfections in radio devices &#x2014; An overview

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Digital signal processing for reducing the effects of RF imperfections in radio devices — An overview