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.
Naina said:
1 decade ago
As the figure shows, the feedback is given to the noninverting terminal so gain will be (-rf/r1) so answer should be -10 according to the above equation.
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.
Padma T M said:
4 years ago
It is a Non-Inverting Amplifier.
So, the voltage gain formula, Av = 1+(Rf/R1).
= 1+(1000/100),
= 100+1000/100,
= 1100/100 = 11.
So, the voltage gain formula, Av = 1+(Rf/R1).
= 1+(1000/100),
= 100+1000/100,
= 1100/100 = 11.
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
Lokesh said:
1 decade ago
I think the formula should be different. What you said is for non inverting op right.
Avdhut said:
1 decade ago
Its very simple....1+(RF/R1) which is the gain off non inverting amplifier.
Achu said:
1 decade ago
It is non-inverting amplifier so the formula is
Vo/Vin=1+Rf/R1.
Vo/Vin=1+Rf/R1.
Dhruvansh gupta said:
1 decade ago
Here, the gain is =-10. Because the feedback through r1 not rf.
Bimleh singh said:
1 decade ago
Gain of non inverting amplifier is 1+ (Rf/R1) hence gain =11.
Rajesh Gaini said:
4 years ago
Voltage gain Formula Is 1+Rf/R1.
= 1 + 100/10,
= 11.
= 1 + 100/10,
= 11.
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