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alias filter
Archimedan Prüfer Structures Alias Filter Archimedean d-Semigroups
      
A 2kHz six-pole Butterworth lowpass filter acts as an anti-alias filter for data acquisition systems.
      
Based on the optimal non-orthogonal lattice we derive a 2-D anti-alias filter.
      
Before the signal is sampled by the switched-capacitor filter, an anti-alias filter must be used.
      
Following the anti-alias filter the signal passes to the main analog-to digital converter which digitizes the input signal at the sampling rate.
      
For systems implementing a broad range of speeds, selectable cutoff frequencies for the passive anti-alias filter should be used.
      
For obvious reasons, the pre-amplifier and the anti-alias filter must be realized as continuous-time circuits.
      
Figure 3 depicts the measured frequency responses of the pre-amplifier and the anti-alias filter.
      
Figure 5 displays the spectral noise voltage as recorded at the inverting anti-alias filter output.
      
Furthermore, a 50 Hz anti-alias filter is included in the circuit design.
      
For instance, it could already be band-limited so that the anti-alias filter is not required.
      
However, it is completely unable to deal with the drop above 20kHz caused by the anti-alias filter.
      
However, if an anti-alias filter is necessary a single pole RC filter is usually sufficient.
      
Hz thermal noise floor produced by the preamplifier/anti-alias filter cascade.
      
However, it does fail to capture the convoluted anti-alias filter that almost certainly precedes the Analogue to Digital conversion.
      
In undersampling systems, the anti-alias filter must be a bandpass function.
      
Recorded spectral noise voltage density at inverting anti-alias filter output.
      
Then, based on lattice parameters, we find frequency-domain specifications of the anti-alias filter.
      
The anti-alias filter in a conventional baseband system is a lowpass filter.
      
The end result is a minimal requirement for the anti-alias filter on the front end.
      
 

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