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Dual-path sampled anti-alias filtering
Woertman, Thomas (2025) Dual-path sampled anti-alias filtering.
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| Abstract: | This paper presents a novel approach to anti- aliasing filters, dual-path sampled filters. Conventionally anti-aliasing filters are implemented using a regular low-pass filter and buffer in front of the analog-to-digital converter’s (ADC) sample- and-hold. In modern ADCs this analog frontend can require more power than the rest of the ADC. Instead the anti-alias filter might be implemented with dual-path sampling, the unfiltered signal is applied to the top plate of the sampling capacitor, while a high-pass filtered signal is applied to the bottom plate. In theory this cancels the signals of high frequency out over the sampling capacitor, while leaving signals with low frequencies intact. To investigate this two dual-path filters were analysed, a first order filter with a low-pass response, and a second order filter with a low-pass notch response. Both filters were compared against similar regular alternatives in terms of component usage, filter response, driving requirements, noise, and total harmonic distortion. It was found that the first-order dual-path filter dissipates 4x more power than the single-path filter for an equal SNR, and is more expensive, but is otherwise equivalent. The second order filter requires 4x more power than a comparable biquad filter to get an equal SNR, but has a worse response and driving requirements. It is then concluded that dual-path filters do not provide a superior alternative to regular single-path filters, requiring more power to achieve an equal SNR. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 53 electrotechnology |
| Programme: | Electrical Engineering BSc (56953) |
| Link to this item: | https://purl.utwente.nl/essays/107247 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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