Single MOS-FET, 3rd order Low-pass filter
Download lpf3mos-0.2.asc, the schematic file for the LTspice XVII.
Frequency response and group delay
Step response
Distortion
A=0.1, Total Harmonic Distortion: 0.032919%(0.032919%) A=0.2, Total Harmonic Distortion: 0.066547%(0.066547%) A=0.5, Total Harmonic Distortion: 0.180365%(0.180365%) A=1.0, Total Harmonic Distortion: 0.577749%(0.577757%)