Opamp resistor values

Thread Starter

nepdeep

Joined Sep 14, 2011
140
Why can we not put 1 ohm or 1 Meg ohm? in the input terminal of the opamps....Does it have something to do with the bias current?
 

crutschow

Joined Mar 14, 2008
34,285
Do you understand Ohm's law? Too small a resistor and the current becomes too high for a given signal voltage. Too large a resistor will cause a voltage drop (offset) due to the op amp bias current. Thus typical op amp resistor values go from a few kΩ to perhaps a few hundred kΩ. But if you have a very low bias current input op amp such as a MOSFET or JFET type than you can go above a megohm if needed
 

Audioguru

Joined Dec 20, 2007
11,248
Why can we not put 1 ohm or 1 Meg ohm in the input terminal of the opamps?
Opamps do not have "terminals". Train and bus stations have terminals.
Opamps have inputs and outputs. What are you talking about?

Are you talking about an inverting or a non-inverting opamp amplifier?
 
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