Lab 10: Op-Amps II

Intro:

The purpose of this lab is to observer the effect of the changing the feedback resisitor on an op-amp circuit with a network of voltages.

Data:

R­₁: 9.80kΩ       R_F 94.7Ω

Vin Desired      Vin Actual Vout Measured V_RF Measured Iop Calculated

Vin Desired	Vin Actual	Vout Measured	VRF Measured	Iop Calculated
0.25V	0.254V	-2.458V	2.458V	0.01mA
0.5V	0.5V	-4.92V	4.92V	0.01mA
1.0V	0.91V	-9.67V	9.67V	0.01mA

I_CC = 1.08 mA              I_EE = -0.97 mA

Vin Desired	Vout Measured	VRF Measured	Iop Calculated	ICC Measured	IEE Measured
1.0V	1.0V	-9.07V	0.01mA	1.08 mA	-0.97mA

Analysis:

The since the op-amp was an inverting one the voltage became negative.  The voltage was also amplified by 10 times.  KCL should apply, but our result was a bit off.  I_CC + I_EE should be 0.  We get 0.11mA.