Op-Amp Explorations Mike Farrell 3/30/2011. Outline Goals and Setup Op-Amp Input current Simple Inverting Amp Simple Non-Inverting Amp Combine the two.

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Presentation transcript:

Op-Amp Explorations Mike Farrell 3/30/2011

Outline Goals and Setup Op-Amp Input current Simple Inverting Amp Simple Non-Inverting Amp Combine the two Non-Ideal Analysis

Goals Prove that the ideal Op-Amp model is valid Prove that the non-ideal model is more accurate but not necessary. Demonstrate how to hook up Op-Amp circuits

Setup All Circuits use a LM741C opamp Power Supply is +- 15V Ideal Constraints –In=Ip=0 –Vn=Vp –Av=Inf –Rin=Inf –Ro = 0

Op-Amp Input Current Circuit

Input Current Results Measured Vp and Vn. I=(0-Vx)/100K (Passive Sign Convention) All measurements are within spec for data sheet and very close to ideal. Ideal741 Data Sheet Measured Vp (mV) Vn (mV) Ip (nA)080nA typ 500nA max 43.4 In (nA)045.6

Inverting Op-Amp Circuit

Non-Inverting Op-Amp Circuit

Non-Inverting/Inverting Results InvertingNon-Inverting Ideal (V) Measured (V) % ErrorIdeal (V) Measured (V) % Error Vp Vn Vout

Combo Op-Amp Circuit Combination of Inverting and Non-Inverting Amplifiers

Combo Op-Amp Results with Non- Ideal Calculations IdealMeasuredNon-Ideal Model -- Calculated (V) % Error (V)% Error Vp Vn Vout023.2m--.397u--

Non-Ideal Circuit used for Calculations

Conclusions In and Ip <50nA (~0A) Vn = Vp Using realistic Av, Rin, and Ro does not have a significant effect on voltage error. Vout errors all less than 1% from ideal

Slide 14 Questions?