Revision as of 12:25, 11 January 2010

Ideal Op Amp Characteristics

Infinite input impedance
Infinite open-loop gain for the differential signal
Zero gain for the common mode signal
- You can easily change an differential amplifier into a common-mode amplifier by grounding one of the inputs
Zero output impedance
Infinite bandwidth
- To allow for infinite gain regardless of the frequency?

No current flows into the + or - terminals
If negative feedback is present (and no positive feedback), then $V_{+} = V_{-}$
Write nodal equations at $V_{+}$ and $V_{-}$ , but not at $V_{o}$

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 =Ideal Op Amp Characteristics=
-*Infinite input impedance
+*[[Chapter_1#Amplifier_Models | Infinite input impedance]]
 *Infinite open-loop gain for the differential signal
 *Zero gain for the common mode signal
-*Zero output impedance
+**You can easily change an differential amplifier into a common-mode amplifier by grounding one of the inputs
-*Infinite bandwidth?
+*[[Chapter_1#Amplifier_Models | Zero output impedance]]
+*Infinite bandwidth
+**To allow for infinite gain regardless of the frequency?
 =Op Amp Nodal Analysis=
 *No current flows into the + or - terminals
 *If negative feedback is present (and no positive feedback), then <math>V_+ = V_-\,</math>
 *Write nodal equations at <math>V_+\,</math> and <math>V_-\,</math>, but not at <math>V_o\,</math>