Electronic Devices - Operational Amplifiers - Discussion
Discussion Forum : Operational Amplifiers - General Questions (Q.No. 14)
14.
Calculate the overall voltage gain of the circuit if R1 = 100 
and Rf = 1 k.
and Rf = 1 k. 
Discussion:
15 comments Page 1 of 2.
Adarsh said:
1 decade ago
It should be -10 rite ? av=-rf/ri.
Lokesh said:
1 decade ago
I think the formula should be different. What you said is for non inverting op right.
Kranti said:
1 decade ago
Gain = (Rf+R1)/R1
Dheeraj said:
1 decade ago
The formula for voltage gain here is
Gain=1+Rf/R1.
Gain=1+Rf/R1.
Justen said:
1 decade ago
For non inverting op amp:
Gain=1+Rf/R1
Gain=1+Rf/R1
Sandeep malik said:
1 decade ago
Voltage gain=-(rf/ri). so it should be -10
Ovii said:
1 decade ago
As input voltage is applied at + terminal which is also known as non inverting input.
non invrtibg gain = 1+rf/ri
non invrtibg gain = 1+rf/ri
Achu said:
1 decade ago
It is non-inverting amplifier so the formula is
Vo/Vin=1+Rf/R1.
Vo/Vin=1+Rf/R1.
Bimleh singh said:
1 decade ago
Gain of non inverting amplifier is 1+ (Rf/R1) hence gain =11.
Shailendra nagar said:
1 decade ago
Inverting and non-inverting voltage are same.
So from KCL,
-Vi/R1 = (Vi-Vo)/Rf.
Vo/Vi = (R1+Rf)/R1.
GAIN = (100+1000)/100.
= 11.
So from KCL,
-Vi/R1 = (Vi-Vo)/Rf.
Vo/Vi = (R1+Rf)/R1.
GAIN = (100+1000)/100.
= 11.
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