Hi,

I want to control the input impedance to 1 kΩ at the input of an op-amp circuit. I have five op-amp configurations:

1. Voltage Follower
2. Non-Inverting
3. Inverting
4. Differential Op-Amp
5. Instrumentation Op-Amp

Can anyone help me with this?

 

In the inverting configuration, the input impedance is simply the series resistor on the - input.

 

hi @ddc
Is this a Homework or Colleges assignment??

Moderation.

 

Hi,

I want to control the input impedance to 1 kΩ at the input of an op-amp circuit. I have five op-amp configurations:

1. Voltage Follower
2. Non-Inverting
3. Inverting
4. Differential Op-Amp
5. Instrumentation Op-Amp

Can anyone help me with this?

You need to show YOUR best attempt to answer the questions.

Start with #1.

Draw the circuit.

What is the input impedance?

What could you do to change that from what it is to 1 kΩ?

Once you get this one, the others will probably be pretty easy.