A 65nm CMOS CT ΔΣ Modulator with 81dB DR and 8MHz BW Auto-Tuned by Pulse Injection

Shu, Yun-Shiang; Song, Bang‐Sup; Bacrania, K.

doi:10.1109/isscc.2008.4523276

Cited by 17 publications

(6 citation statements)

References 1 publication

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“…Most of these techniques employ area consuming replica circuits in a master-slave configuration. Recently, calibration techniques using automatic tuning have been proposed, such as [3] and [4]. The latter technique is used on-line in a SL modulator with spread zeroes.…”

Section: Proposed Calibration Techniquementioning

confidence: 99%

“…If there is a mismatch between these coefficients, part of w1(n) will not be cancelled and will appear at the output of the modulator. This leakage is detected by the deviation sensing block as it has been proven already in [4] and [5], by multiplying a delayed version of w2(n) with v(n) and accumulating this product. Based on such detection, the array control block switches an array of passives to tune the coefficients.…”

Section: Proposed Calibration Techniquementioning

confidence: 99%

“…This leads to a deviation from the desired noise-transfer-function (NTF) and, potentially, to an increment of the in-band-noise (IBN) and instability. Consequently, correction techniques, such as [1,2,3,4], are generally required so as to counteract such deviation.…”

Section: Introductionmentioning

confidence: 99%

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Built-in self calibration for process variation in single-loop continuous-time sigma-delta modulators

Garcia

Rusu

2010

2010 17th IEEE International Conference on Electronics, Circuits and Systems

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A novel built-in self calibration technique for single-loop continuoustime sigma-delta modulators is proposed. Using out-of-band test signal injection and digital cancellation, this technique provides an area efficient, highly digital calibration structure to counteract gain variations in the loop filter. The calibration methodology and mathematical analysis are presented using a 2 nd order multibit sigma-delta modulator as a proof of concept. The effect of the finite gainbandwidth of amplifiers is included when evaluating the calibration method. The proposed technique is validated through corner simulations using behavioral models and it shows that degradation in the signal-to-noise-plus-distortion ratio can be counteracted.

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Section: Proposed Calibration Techniquementioning

confidence: 99%

Section: Proposed Calibration Techniquementioning

confidence: 99%

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Built-in self calibration for process variation in single-loop continuous-time sigma-delta modulators

Garcia

Rusu

2010

2010 17th IEEE International Conference on Electronics, Circuits and Systems

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“…E.g., the least-squares error criterion was applied in [2] by using a calibration band to estimate filter nonidealities. In [3], test-signals have been injected into the filter instead. Although most of the published algorithms achieve feasible results, commonly only a single nonideality has been considered and all others were assumed to be ideal.…”

Section: Introductionmentioning

confidence: 99%

Concurrent estimation of amplifier nonidealities and excess loop delay in continuous-time sigma-delta modulators

Lorenz

Brückner

Ritter

et al. 2013

2013 IEEE International Symposium on Circuits and Systems (ISCAS2013)

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In this work, a method for the concurrent estimation of nonidealities in continuous-time sigma-delta modulators is presented. Several nonidealities can degrade the performance of a sigma-delta modulator, even up to instability of the entire circuit. However, if these nonidealities are known, it is possible to correct for most of them -either in the analog or digital domain. In the past, many techniques for corrections of errors in sigma-delta modulators have been presented. Although these works show good results, most are only able to work on a single or few nonidealities simultaneously. In this paper, a feasible approach for estimating several nonidealities in a joint fashion has been applied to estimate some of the most prominent errors in a continuous-time sigma-delta modulator.

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“…technique used for the single-stage CT DSM[6] is modified for this cascaded design. The calibration blocks are shown at the top of…”

mentioning

confidence: 99%

A self-calibrated 2–1–1 cascaded continuous-time ΔΣ modulator

Kamiishi

Shu

Tomioka

et al. 2009

2009 IEEE Custom Integrated Circuits Conference

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A 2-1-1 cascaded continuous-time ΔΣ modulator (DSM) is self-calibrated with LMS-based adaptation. Its noise cancellation filter (NCF) is derived using a parameter-based continuous-time (CT) to discrete-time (DT) transform. These techniques reduce the quantization noise leakage due to the mismatch between analog modulator and digital NCF. A 0.18-μm CMOS prototype operating at 360MHz with a 1-V pp full-scale demonstrates a leakage noise spectral density below 10nV/√Hz over a 30-MHz bandwidth after the capacitors in the Gm-C loop filters are self-trimmed with a 1.1% step. This level of noise leakage is well below the noise floor of most CT DSM designs.

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A 65nm CMOS CT ΔΣ Modulator with 81dB DR and 8MHz BW Auto-Tuned by Pulse Injection

Cited by 17 publications

References 1 publication

Built-in self calibration for process variation in single-loop continuous-time sigma-delta modulators

Built-in self calibration for process variation in single-loop continuous-time sigma-delta modulators

Concurrent estimation of amplifier nonidealities and excess loop delay in continuous-time sigma-delta modulators

A self-calibrated 2–1–1 cascaded continuous-time ΔΣ modulator

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A 65nm CMOS CT ΔΣ Modulator with 81dB DR and 8MHz BW Auto-Tuned by Pulse Injection

Cited by 17 publications

References 1 publication

Built-in self calibration for process variation in single-loop continuous-time sigma-delta modulators

Built-in self calibration for process variation in single-loop continuous-time sigma-delta modulators

Concurrent estimation of amplifier nonidealities and excess loop delay in continuous-time sigma-delta modulators

A self-calibrated 2&#x2013;1&#x2013;1 cascaded continuous-time &#x0394;&#x03A3; modulator

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A self-calibrated 2–1–1 cascaded continuous-time ΔΣ modulator