Effective dithering of sigma-delta modulators

Norsworthy, Steven R.

doi:10.1109/iscas.1992.230265

Cited by 56 publications

(29 citation statements)

References 10 publications

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“…The proposed sigma-delta modulator includes an additional input, the dither signal, which is a pseudo random number sequence. This signal is added into the modulator loop before the quantizer [5] as illustrated in Fig. 2 of the second order modulator, which has an error feedback structure.…”

Section: A Principle Of Operationmentioning

confidence: 99%

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Dithered multi-bit sigma-delta modulator based DPWM for DC-DC converters

Mooney

Halton

Iordanov

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-Multi-bit sigma-delta based digital pulse width modulators (DPWM) are used in the control of DC-DC converters in order to achieve high resolution and therefore high output voltage accuracy at switching frequencies up to multiple MHz. The standard sigma-delta modulators which have been used in these DPWMs to date generate idle tones in the applied duty cycle which result in large oscillations in the output voltage. A dithered sigma-delta modulator is instead implemented here which eliminates these oscillations in the output voltage by adding a random signal before the quantizer in the sigma-delta modulator. The power spectral density of the duty cycle produced by the dithered sigma-delta modulator based DPWM shows a reduction in the undesirable idle tones and this is also verified experimentally using a buck converter prototype.

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Section: A Principle Of Operationmentioning

confidence: 99%

“…This method is widely used to suppress the effect of idle tones in sigma-delta data converters [5] and has also been used in sigma-delta modulators for variable switching frequency DC-DC converters [6][7] but not for fixed switching frequency converters.…”

Section: Introductionmentioning

confidence: 99%

Dithered multi-bit sigma-delta modulator based DPWM for DC-DC converters

Mooney

Halton

Iordanov

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…When a small signal is applied to a second order SDM, the problem of idle tones often causes performance degradation. Dithering is a common method of alleviating this issue but needs extra hardware to implement [4]. At large signal levels, the distortion terms can dominate the SNDR because of the saturation in the sigma delta loop.…”

Section: Introductionmentioning

confidence: 99%

A 107.4 dB SNR Multi-Bit Sigma Delta ADC With 1-PPM THD at $-$0.12 dB From Full Scale Input

Wu¹,

Zhang²,

Subramoniam³

et al. 2009

IEEE J. Solid-State Circuits

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“…Many papers have been published about the dithering of ~ A modulators [3,4,5,6,7,8]. From these papers it appears that the statistical analysis of dithered non-feedback quantizers [9,10] is applied to ~A modulators.…”

Section: Introductionmentioning

confidence: 99%

A new dithering method for sigma-delta modulators

Jong

Meijer

Roermund

1996

Analog Integr Circ Sig Process

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A new dithering method to remove limit-cycles in Sigma-Delta modulators is presented. With this new method, the sequence length of a Pseudo-Noise generated dither is matched to the digital decimation filter. This causes the frequency spikes of the dither to coincide with the notches of the filter which results in total elimination of the applied dither power. In contrast to existing dithering techniques, matched dithering will not introduce additional inband noise. Compared to existing dithering techniques, the required dither amplitudes are relatively small (5%-30% FS) and may decrease with increasing oversampling ratio. Matched dithering proves to be very powerful for instrumentation applications.

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Effective dithering of sigma-delta modulators

Cited by 56 publications

References 10 publications

Dithered multi-bit sigma-delta modulator based DPWM for DC-DC converters

Dithered multi-bit sigma-delta modulator based DPWM for DC-DC converters

A 107.4 dB SNR Multi-Bit Sigma Delta ADC With 1-PPM THD at $-$0.12 dB From Full Scale Input

A new dithering method for sigma-delta modulators

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