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  1. C

    [SOLVED] Amplifier (+frequency response) ??? homework

    Hi requester, this link looks very helpful in designing: http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/npnce2.html#c3
  2. C

    Output impedance of opamp

    Hi FvM, is the attached figure the correct way to do it? The op-amp inputs are shorted to ground because if we want to evaluate the effects of the current source, all other sources must be made 0, from superposition theorem, right? Then plotting the output voltage/current is the output impedance...
  3. C

    Output impedance of opamp

    Hi all, what we have learnt is that the output impedance of an opamp is very small. I cannot seem the find this information in the datasheet of the opamp I am looking at. May I know how can I measure the output impedance of an opamp using only spice?
  4. C

    [SOLVED] Op-amp voltage follower not following input

    Ok, I managed to import the OPA683 spice into LTSpice and it simulates fine at +/- 3.3 V.
  5. C

    [SOLVED] Op-amp voltage follower not following input

    The datasheet says power supplies from +/- 2.5 V to +/- 6 V, so I think +/- 3.3 V should work. These are simulated results using TINA-TI, available free from TI.com. I reran the simulation placing Rf and also changing V1 to 1 V. The DC sweep for Rf from 0 Ohm to 2k Ohm using +/- 3.3 V supplies...
  6. C

    [SOLVED] Op-amp voltage follower not following input

    Hi, I have a simple op-amp voltage follower using OPA683. When the op-amp is powered by +3.3 V and -3.3 V supplies, the ouput voltage maxed out at ~200 mV when I change the input from 0 V to 1 V. But when I change the power supply to +5 V and -5 V, the output follows the input. Any idea why...
  7. C

    What are the 4 pins in RF transistor for?

    Hi, I often encounter RF transistors with 4 pins instead of the usual 3 pins. 2 of the pins are emitter pins. Why are the 4 pins? How do I use the 2 emitter pins?

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