why the input resistance of an op-amp is high whereas it's
output resistance is low?
Answer Posted / dlhylton
An op amp has high input impedance to prevent loading. When
the impedance is very high, the current that the op amp
draws is very low.
Op amps also have high input impedance because it's a
voltage gain device. In order for the op amp to amplify the
voltage, the voltage signal must drop fully across. And for
this to happen, the op amp must have high input impedance,
v=ir. The greater the impedance, the greater the voltage
drop.
Check out:
http://www.learningaboutelectronics.com/Articles/Why-does-
an-op-amp-need-a-high-input-impedance-and-a-low-output-
impedance
for full explanation
Is This Answer Correct ? | 4 Yes | 1 No |
Post New Answer View All Answers
For the cmrr to be infinite what will be the condition?
simplification of Boolean Expression- A+A'B.
can u split the Point code switch(PC)
What is the maximum or minimum value of tv in msa to calculate r&r?
Explain in detail norton`s theorem.
What is the tri state of a signal?
State the de morgan's theorem?
Write down the expression for average output voltage for step down chopper?
what do you want to join this bank
What is fm transceiver.
how can i prepare for the apgenco can u send old qps to jeedipally@gmail.com
Why signalling link load should be less than 30% in telecommunication?
what should I refer for examination of BSNL-TTA. Please suggest me good reference...so that I can clear this exam.
plz help how can i operate my n/w support system through ,help me by providing complete soln
Amplitude modulation is basically a A Summing of two signals B Multiplication of two signals C Subtraction of two signals D Non-linear process