View Feed
group-icon
Coffee Room
Discuss anything here - everything that you wish to discuss with fellow engineers.
12940 Members
Join this group to post and comment.
ddspliting
ddspliting • Aug 26, 2008

Input Resistance and Sensitivity...

While studying JFET I came across the statement...

"A device/circuit with input resistance much high is usually very sensitive"

its a general statement though but i don't understand well.
Can any one tell me any reason for that? ........
reachrkata
reachrkata • Aug 28, 2008
I think what it indicates that even small currents flowing into the device can lead to considerable voltages at the inputs.

-Karthik
just2rock
just2rock • Sep 2, 2008
V=KIR...that means voltahge will take control on current flow depending upon resistance...not vice versa 😕
reachrkata
I think what it indicates that even small currents flowing into the device can lead to considerable voltages at the inputs.

-Karthik
reachrkata
reachrkata • Sep 3, 2008
just2rock
V=KIR...that means voltahge will take control on current flow depending upon resistance...not vice versa 😕
Hmm. Let me explain it this way then.
Say you have a voltage source connected via a series resistance to this device. It is clear that the device's resistance and the series resistance form a potential divider. Now higher the device's resistance more is the voltage across it. In addition, if the device is voltage sensitive, it could get triggered due to this voltage.

Hope this clarifies !!
- Karthik
😒

Share this content on your social channels -