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We chose the LC Butterworth filter stage below in figure 9.
In Figure 4, you can see an example of the result with a 5th order Butterworth filter and a 3-bit AADC.
The amplified signal is then filtered using a high pass butterworth filter at 50MHz to diminish the baseline wandering and slow motion interference and a lowpass butterworth filter at 150Hz to diminish the EMG interference .
Using SPI control, system designers can select the corner frequency of the 31-MHz, 6-pole Butterworth filter in 1-MHz resolution.
The amplifiers incorporate a fifth-order Butterworth filter, which can be used as an encoder's digital-to-analog converter (DAC) reconstruction filter.
Filtering - Enable or disable the use of the 2-pole, 10 kHz, Butterworth filter.
For example, there is an applet assisting with the design of a simple Butterworth Filter and one containing a reflectometer calculator.
The filter approximates the performance of a 4th order Butterworth filter with an optimization toward low overshoot and flat group delay.