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Input Resistance and Sensitivity...

Question asked by ddspliting in #Coffee Room on Aug 26, 2008
ddspliting
ddspliting · Aug 26, 2008
Rank E1 - BEGINNER
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? ........ Posted in: #Coffee Room
reachrkata
reachrkata · Aug 28, 2008
Rank C2 - EXPERT
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
Rank B3 - LEADER
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
Rank C2 - EXPERT
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
😒

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