modified 10 years ago

Inverting op amp in/out resistances

03:11:56

An inverting configuration using an op amp with signal source resistance and load resistance. A resistor is inserted after the op amp to model its output resistance.

published 10 years ago

rich11292000

10 years ago

They have high parallel resistance between the inputs also.

hurz

10 years ago

The input resistance is 1kOhm

rich11292000

10 years ago

"A typical 741 op amp has an differential input impedance of about 2 MΩ" https://en.m.wikipedia.org/wiki/Operational_amplifier

rich11292000

10 years ago

//Internal circuitry of 741-type op-amp, //Input impedance

hurz

10 years ago

1k || 2M = 999.5 Ohm

cjwinstead

10 years ago

The point here is to demonstrate the low input resistance of inverting configurations and their associated resistive coupling at the circuit's input terminal.

hurz

10 years ago

I know

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