http://imgur.com/XQJrZ
- Find the input impedance at the nodes Va and Vb to ground.
Would this just be R1 for both, respectively? Since it is going to ground, there is current going through the resistors, resulting in input impedance, correct?
- Find the output impedance at the nodes Vo to ground.
For an ideal op-amp, it would be zero, but it can't be zero in this case because of the current going from the bottom amplifier to the top amplifier to Vo, is that correct? I can't figure out how to find it.
- Find the input impedance at the nodes Va and Vb to ground.
Would this just be R1 for both, respectively? Since it is going to ground, there is current going through the resistors, resulting in input impedance, correct?
- Find the output impedance at the nodes Vo to ground.
For an ideal op-amp, it would be zero, but it can't be zero in this case because of the current going from the bottom amplifier to the top amplifier to Vo, is that correct? I can't figure out how to find it.