The flow graph usage for the attenuation correction of the low-pass Sallen-Key biquad in the current mode

Brtnik, Bohumil; Matoušek, David

doi:10.1109/ae.2016.7577237

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Discussion Of a Solution Based On Adding Another1

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2022

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Cited by 2 publications

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“…ACTIVE ELEMENT TO THE FILTER FEEDBACK Another well-known possibility of solving the problem of degradation of the attenuation of the filter at high frequencies is to connect another operational amplifier in voltage mode [6] or conveyor in current mode [11], [12] of the filter, according to Fig. 11.…”

Section: Discussion Of a Solution Based On Adding Anothermentioning

confidence: 99%

Influence of the Low-Pass Filter Order to the Attenuation Deviation at the High Frequencies

Brtnik

Matoušek

2022

2022 New Trends in Signal Processing (NTSP)

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The Sallen-Key low-pass biquad shows a decrease in attenuation at high frequencies because the real operational amplifier has a finite transit frequency. As a result, the course of the actual frequency response deviates from the ideal. Generally, this phenomenon occurs only in even-order filters in both Voltage Mode (VM) and Current Mode (CM) but is no longer observed for odd-order filters. When determining the order of the filter, it is always necessary to round the calculated value upwards, so it is discussed whether it is appropriate to round it up to the nearest odd number. Finally, this method of attenuation decrease correction is compared with the correction using another active element.

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Section: Discussion Of a Solution Based On Adding Anothermentioning

confidence: 99%