jackieyoung
Newbie level 1
Hi,all
I have some problems about SC circuit design.Please give me some advices.
When i design a opamp used in a SC circuit,is it necessary to make sure its common mode input voltage equal common output volatge? I think it may not necessary but how can i decide the next input stage common mode voltage if i wish to use the same op ?
Abother problem is that how can i define a opamp input common mode voltage using a capacitor feedback from output,like a SC integrator? I find using a capactor for negative feedback can fail.The opamp acts as open loop,not closed loop.Is it something wrong?? I use a ideal opamp in hsipce.
I think the ground sign on the text book means AC ground.Should I add a common mode source to the input to bias the opamp??
Thanks
I have some problems about SC circuit design.Please give me some advices.
When i design a opamp used in a SC circuit,is it necessary to make sure its common mode input voltage equal common output volatge? I think it may not necessary but how can i decide the next input stage common mode voltage if i wish to use the same op ?
Abother problem is that how can i define a opamp input common mode voltage using a capacitor feedback from output,like a SC integrator? I find using a capactor for negative feedback can fail.The opamp acts as open loop,not closed loop.Is it something wrong?? I use a ideal opamp in hsipce.
I think the ground sign on the text book means AC ground.Should I add a common mode source to the input to bias the opamp??
Thanks