analogartist
Junior Member level 2
source follower pole
When trying to intutively understand how a zero occurs in a circuit...
For any zero I am of the understanding that for a finite Vin ==> the ouput Vout(Sz) =0 [Sz being the freq of the zero.]
Now, if I apply a signal at the input then
In a common source stage:
Intutively, The feed-forward path(thru Cgd) and the main transistor path both produce signals which are equal in mag but opposite in phase and they cancel out each other to give a zero at the ouput.
But how does the zero occur in source follower stage?.. since the input and the output(main transistor path) are in the same phase , aswell as the signal thru feed-forward path(thru Cgs) will be in the same phase as the input signal. how does the output go to 0 for a zero(@Sz) to exist?
I tried my best to explain without the aid of a paper and pen...pls do let me know if i need to be more clear..
I can write equations and get the transfer function and prove them right but cant seem to understand them intutively.... hence the post!!!
thx
When trying to intutively understand how a zero occurs in a circuit...
For any zero I am of the understanding that for a finite Vin ==> the ouput Vout(Sz) =0 [Sz being the freq of the zero.]
Now, if I apply a signal at the input then
In a common source stage:
Intutively, The feed-forward path(thru Cgd) and the main transistor path both produce signals which are equal in mag but opposite in phase and they cancel out each other to give a zero at the ouput.
But how does the zero occur in source follower stage?.. since the input and the output(main transistor path) are in the same phase , aswell as the signal thru feed-forward path(thru Cgs) will be in the same phase as the input signal. how does the output go to 0 for a zero(@Sz) to exist?
I tried my best to explain without the aid of a paper and pen...pls do let me know if i need to be more clear..
I can write equations and get the transfer function and prove them right but cant seem to understand them intutively.... hence the post!!!
thx