Complete the following table for feedback amplifiers using one ideal op-amp wher
ID: 1924492 • Letter: C
Question
Complete the following table for feedback amplifiers using one ideal op-amp where Rin represents
the input resistance of the overall amplifier, R1 represents the input resistor and R2 represents the
feedback resistor.
a)gain=-10 V/V Rin= 10 k, R1=? R2=?
b) gain=-1 V/V R1=100 k3, Rin=? , R2=?
c) gain=-2 V/V,
R2=100 k, R1=? , R3=?
d ) gain=-0.5 V/V, Rin= 10 k, R2=? R1=?
e) gain= +1 V/V,Rin= 8, R1=? R2=?
f)GAIN= +2 V/V , R1=10 k, R2=?, Rin=?
g )Gain =+11 V/V ,R2=100 k, R1=? Rin?
Explanation / Answer
For inverting configuration, gain = -R2/R1, Input resistance = R1 http://www.ecircuitcenter.com/circuits/opinv/opinv.htm Non inverting configuration, gain=1+ R2/R1, input resistance = R1 http://www.ecircuitcenter.com/circuits/opnon/opnon.htm a) R1= 10K => R2=100K b) Rin=100K, R2=100K c)R1=50K, Rin=50K d) R1=10K, R2=5K e)R2= 0, R1=10K (voltage follower circuit) f) R2=R1=Rin = 10K g) R2=100k => R1=10K=Rin