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2nd Order Low-Q Active Filter Design
This tool calculated the required resistor and capacitor values for a second order low-Q active filter. The routine assumes the input signal swing will be differential peak swing of 80%*VDD. Given the SNR, and the swing the resistor and capacitors can be sized. The filter has all real poles and thus the Q is limited to 0.5.

Block diagram

Inputs
Voltage Gain V/V
3dB bandwidth Hz
Signal to Noise Ratio dB
Supply Voltage V
Q
 
Outputs
R1 kΩ
Rf kΩ
C1 pF
Cf pF
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