I
[email protected]
- Jan 1, 1970
- 0
I'm studying buffered opamp and i've found this configuration
http://img156.imageshack.us/img156/5640/afsdafen7.png
i don't understand second statement
"reduces output load at the drains of M6 and M7"
I don't understand why a large resistance at the drains of M6 and M7
is a bad thing...if i consider voltage gain of second stage, it is
similar to
(gm6+gm7)*output resistance
so, if output resistence is high, the voltage gain of the second stage
is high and the opamp votage gain is high....i think this is a good
thing....
What's the problem?
Thanks in advance
http://img156.imageshack.us/img156/5640/afsdafen7.png
i don't understand second statement
"reduces output load at the drains of M6 and M7"
I don't understand why a large resistance at the drains of M6 and M7
is a bad thing...if i consider voltage gain of second stage, it is
similar to
(gm6+gm7)*output resistance
so, if output resistence is high, the voltage gain of the second stage
is high and the opamp votage gain is high....i think this is a good
thing....
What's the problem?
Thanks in advance