Chapter 2

Ideal Op Amp Characteristics

• Infinite input impedance
• Infinite open-loop gain for the differential signal
• Zero gain for the common mode signal
• Zero output impedance
• Infinite bandwidth?

Op Amp Nodal Analysis

• 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 $V_{o}\,$