So with the help of various tweeks ,Ive managed to get THD and noise from my budget Feeltech arb gen down below -95db or 0.002 % , that only occurs at favourable frequencies where processing clock speed coincides mathmatically , in practise as you sweep frequency distortion varies as well , the basic spec of the machine from the factory is 0.5% thd, stepping the waveform between known sweet spot frequencies allows me to get a consistantly lower distortion across the range .
Could a passive filter tuned for specific test frequencies like 1khz and 10khz get me an extra reduction in THD on the output of my generator ? I could live with some loss in signal level ,which of course would be expected .
I cant figure out what combination of L,C and R would be best . I have several tapped inductors in suitable values for audio lying around .
Could a passive filter tuned for specific test frequencies like 1khz and 10khz get me an extra reduction in THD on the output of my generator ? I could live with some loss in signal level ,which of course would be expected .
I cant figure out what combination of L,C and R would be best . I have several tapped inductors in suitable values for audio lying around .