- Modelling non-ideal operational amplifier
- gain
- Non-idealness
- A is not but
- is not , is not
- complex
- Non-ideal non-inverting case
- Added and
- Conserve current and use Ohm's law
- For large A, high and low
- , which reaches
when , this is a "buffer" to send signal from system into another device without affecting the system
Inverting case
-
use a non-inverting one to achieve high input impedance
- Over a large frequency range, the phase shift of the feedback could become s.t. negative feedback becomes positive feeback and leads to saturation/oscillation. This is countered by built in reduction of A.
- Interlude on feedback