Experiment: Op amplifiers 1

Purpose:  In this experiment, we try to use the operational amplifiers to build the circuit and learn how to amplify the voltage in the circuit. The inverting amplifier circuit will give a A= -Vout/Vin.

Steps:
we assume the Vin= 1V and Vout= -10V, so A= -(-10)/1=10. In addition, we must make the input current less than 1mA, so the input resistor =1V/1mA= 1kΩ and output resistor= 10*1k=10kΩ.

The 5 volt power source to get 1v, we make the Rx=286Ω and Ry=57.6Ω

	Nominal value	Measured value	Rate
Ri	1kΩ	981	0.25
Rf	10kΩ	9830	0.25
Rx	288Ω	286	0.125
Ry	58Ω	58.7	1
V1	12V	12.15
V2	12V	12.14

Then measure the value of Vout,Vin, and Vrf

step5A:

Vin	Vout(M)	Gain(C)	Vin(M)	Iri(C)	Vrf(M)
0	-0.32	null	0.02	0.0000204	0.34
0.25	-2.91	11.64	0.27	0.275	2.85
0.5	-5.31	10.62	0.52	0.53	5.33
0.75	-7.8	10.4	0.77	0.785	7.86
1	-9.97	9.97	0.99	1.01	10.02

step5B:
Iv1=1.51mA
Iv2=0.49mA

Pv1= 12.15*1.51m=18.35mw; Pv2= 12.14*0.49m=5.95mw
It satisfies the power supply constraint to supply no more than 30mW.