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Transcript
Operational Amplifier
Offset terminals (5,1) are used for
circuit calibration.
Power Supplies
The Voltage Transfer
Characteristics of an Op-Amp
Vo will saturate if
Vp-Vn is larger than 0.9 mV
A is typically 10,000
Assume VCC=9 V
9V/10,000=0.9 mV
Input Currents
ip=in=0 for typical op-amp
Virtual Ground Assumption
• If a path can be observed from the
output back to the to the inverting
terminal, negative feedback is in
place, vp=vn can be assumed!
Example of Negative Feedback
Example of Negative Feedback
Example of Negative Feedback
(3)
Intuition
vo=A(vp-vn)
No Feedback!
An Inverting Amplifier
A Summing Amplifier