Re: Why does the ac curve of this OPA has no -3dB breakoff p
Dear huojinsi,
I have few comments here:
1. Are you sure your MOS size is correct? should it in micro meter range? please check and confirm with us
2. Can you please change your Capacitor value C1=1GF and instead of putting the Acm=1 at V2, creat another Vdc with dc=0, ac=1 (V2 with dc=5v only)and connect it btw C1 and GND.
3. If you still cannot get it, can you annotate all the DC point and show it again.
Good luck
Regards,
Smart
Added after 1 minutes:
Yes L=10G and C=1G !?... How much m² would be your chip ?[/quote]
THis is so-called Middlebrook setup, it is not going to intergrate on chip, just for verificatio purpose.
Regards,
Smart