Electronic Devices - Operational Amplifiers - Discussion
Discussion Forum : Operational Amplifiers - General Questions (Q.No. 2)
2.
Refer to this figure. If the value of R1 decreases, the voltage gain will ________ and the input impedance will ________.
Discussion:
12 comments Page 1 of 2.
Assimo said:
2 years ago
@Khizer.
If the impedance decreases, then it increases but in negative.
If the impedance decreases, then it increases but in negative.
Ooredoo said:
4 years ago
Explain about input impedance, please.
Abdul Qayum said:
5 years ago
Thanks @Arvind.
Lakshmi said:
10 years ago
@Subbu.
How do say R1 is input resistance?
How do say R1 is input resistance?
Aravind said:
1 decade ago
@Khizer:
Actually the negative sign indicates that the output will be shifted by 180 degree. So no need to consider about that negative sign.
Actually the negative sign indicates that the output will be shifted by 180 degree. So no need to consider about that negative sign.
Khizer said:
1 decade ago
Here answer is wrong. Because of minus sign. If R1 decreases then the answer will be big but in negative.
Subbu said:
1 decade ago
R1 only input impedance.
If R1 decreases then automatically input impedance decrease.
If R1 decreases then automatically input impedance decrease.
Rishikesh said:
1 decade ago
What about Impedance?
Srinivas said:
1 decade ago
It is invert op-amp so gain= -Rf/R1.
Ami said:
1 decade ago
Gain is indirectly/inversly proportional to rf/r1 as gain increse result decrease.
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