Quadrature Mismatch Shaping for Digital-to-Analog Converters

Reekmans, S.; Maeyer, Jeroen De; Rombouts, Pieter; Weyten, L.

doi:10.1109/tcsi.2006.883842

Cited by 14 publications

(15 citation statements)

References 19 publications

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“…This is an extension of previously reported methods used to whiten or shape the mismatch noise [20]. These methods require a higher level of hardware complexity than the treestructured approach [15].…”

Section: Quadrature Mismatch Shapingmentioning

confidence: 79%

“…This allows both paths to use all available DAC elements in the process of shaping the mismatch noise. As a result, the combined DAC eliminates path mismatch by producing equal gain errors in the I and Q paths (α I ≡ α Q ), as described in [14] and [15]. This is the key advantage to using a quadrature mismatch shaping DAC, but comes at the expense of increased hardware complexity.…”

Section: Quadrature Path Mismatchmentioning

confidence: 99%

“…The technique requires overly complicated hardware that results in reduced mismatch suppression. A complex butterfly shuffler mismatch shaping DAC is considered in [15]. This is an extension of previously reported methods used to whiten or shape the mismatch noise [20].…”

Section: Quadrature Mismatch Shapingmentioning

confidence: 99%

“…However, when applied to quadrature signals, DWA mismatch shaping exhibits lower levels of performance [16]. The technique proposed in this paper extends the tree-based complex mismatch shaper from [15] so as to allow control over the center frequency of the mismatch transfer function.…”

Section: Tunable Mismatch Shapingmentioning

confidence: 99%

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Tunable Mismatch Shaping for Quadrature Bandpass Delta-Sigma Data Converters

Akram

Swartzlander

2011

J Sign Process Syst

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This paper presents an architecture for quadrature bandpass mismatch shaping that allows the center frequency of the mismatch suppression band to be tunable over the entire Nyquist range. The approach is based on the previously reported complex-valued tree-based mismatch shaper, and extends this to allow tunable operation. The proposed design has been implemented using VHDL and synthesized to logic gates. The hardware complexity and mismatch shaping performance of the proposed architecture are compared to that of a reference architecture, which uses separate tunable mismatch shapers for each complex component path. Simulation results show consistent mismatch shaping performance across the entire tuning range.

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Section: Quadrature Mismatch Shapingmentioning

confidence: 79%

Section: Quadrature Path Mismatchmentioning

confidence: 99%

Section: Quadrature Mismatch Shapingmentioning

confidence: 99%

Section: Tunable Mismatch Shapingmentioning

confidence: 99%

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Tunable Mismatch Shaping for Quadrature Bandpass Delta-Sigma Data Converters

Akram

Swartzlander

2011

J Sign Process Syst

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“…This way, some kind of linearization scheme is needed if a linearity beyond the intrinsic device matching is required. For this purpose, dynamic element matching techniques, which achieve spectral shaping of the DAC errors, have been successfully exploited [1][2][3][4][5][6][7][8][9]. However, at low oversampling ratios, such dynamic element matching techniques become inefficient and calibration techniques come into the picture [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Calibration of DAC Mismatch Errors in $\Sigma\Delta$ ADCs Based on a Sine-Wave Measurement

Bock

Xing

Weyten

et al. 2013

IEEE Trans. Circuits Syst. II

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Abstract-We present an off-line calibration procedure to correct the non-linearity due to DAC mismatch in multi-bit Σ∆-modulation A/Dconverters. The calibration uses a single measurement on a sinusoidal input signal, from which the DAC-errors can be estimated. The main quality of the calibration method is that it can be implemented completely in the digital domain (or in software) and does not intervene in any way in the analog modulator circuit. This way, the technique is a powerful tool for verifying and debugging designs. Due to the simplicity of the method it may also be a viable approach for factory calibration.

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