GDF
Full Member level 3
I read a paper which told me the two-stage opamp has better noise than
single stage? I'm wondering why? In terms of thermal noise, the input devices
contribute most, the second stage contributes noise but suppressed by the gain
of first stage. The situation is similar in single stage op. Why the paper told me that?
By the way, I saw an op based gain amplifier with resistor feedback in this paper.
One thing confusing me is the op doesn't include source follower buffer, this is
two stage op. I'm wondering also, why it doesn't worry the resistor load the gain
of this opamp?
single stage? I'm wondering why? In terms of thermal noise, the input devices
contribute most, the second stage contributes noise but suppressed by the gain
of first stage. The situation is similar in single stage op. Why the paper told me that?
By the way, I saw an op based gain amplifier with resistor feedback in this paper.
One thing confusing me is the op doesn't include source follower buffer, this is
two stage op. I'm wondering also, why it doesn't worry the resistor load the gain
of this opamp?