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Glitch from ADG1633 spice model switch

Category: Software

Hello,


I am simulating a synchronous filter on LTSpice in order to completely eliminate the ripple of a sine wave.

To that, i´m following an article published in EDN by Stephen Woodward (Fast PWM DAC has no ripple).

I used a ADG1633 switch to turn-on / turn-off filter´s capacitor as per demonstrated in this article.

It seems to me that everything works fine, but.... I see some weird glitches in the filter output.


I've already changed to other spice models of op amps, but the glitches keep showing up on the output.

I have attached my circuit here.

Could someone give me a hint of what is going on in this circuit ?

Regards,

Leonardo

sync_filter_to_full_elimination_ripple.zip