why the input resistance of an op-amp is high whereas it's
output resistance is low?
- 11 Answers
- 24611 Views
- IBM, I also Faced
- E-Mail Answers
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
what is transformer utilisation factor?
1) is external oscillator XTAL1 &XTAL2 connection must needed ? 2) shall we proceed without oscillator for simple logialoutput
Explain why a voltmeter should be of very high resistance?
What is interfacing?
hi i am electronics & telecomm engg & appling for apprentiship written test and interview. pls forward me the syllabus & old question papers.I will be very much thankful to you. pis inform to 88.avinashkalegmail.com
Explain why an ammeter should be of very low resistance?
How the earting for portable DG set is done?
Explain the different steps of Commissioning.
How do the transition region width and contact potential across a p-n junction vary with the applied bias voltage?
What is a schmitt trigger?
What is monolithic ic?
What are the advantages and disadvantages of quine-mc cluskey method?
Explain radio environment in building.
whats the new trend in ece...? why we are going for embedded..?
write power supply application, manufacturing, advantages, cost
