An 'ideal' op-amp has infinite input impedance, and real ones that you can buy for a
nickel come pretty close. That means that the input impedance or "loading effect" of
an op-amp all by itself is nearly zero, and the loading effect of a circuit that you
build with an op-amp is completely determined by the components you choose to
connect to it. You design the circuit to load the previous stage in any way you want.
Supply voltage , temperature , frequency are factors that effect the electrical parameters of opamp
Feedback in used in an op-amp to limit and control the gain. An op-amp, by itself, has very high gain, often more than 100,000. (A theoretical op-amp has infinite gain.) The external feedback loop forms a divider, more correctly a bridge, that is maintained in balance by the op-amp, giving the desired real gain.
op-amp
op-amp can be nulled using offset voltage about +/- 1.5 mv to offset pins
When the feedback of the output terminal of an Op-Amp is given to the non-inverting terminal [pin 3 for IC-741] of that Op-Amp , then , that circuit is called non-inverting amplifier using Op-Amp. This circuit is called non-inverting because the output signal of this circuit is in phase with the input signal.
Yes, you have to use an op-amp buffer to prevent the loading effect.
Drift is the effect of temperature on an operational amplifier (op-amp). Ideally you want zero drift (ie. op-amp is not affected by change in temperature), however this can never be practically achieved.
So long as you remain with the range of the device (power supply rails less a volt or two), the output of an op-amp will go to what ever value is required to maintain the input stages (bridge) to remain the same. So, the effect on input voltage on output of an op-amp is dependent on the feedback circuit.
Supply voltage , temperature , frequency are factors that effect the electrical parameters of opamp
When the magnitude of Vcc and Vee of op-amp are different the op-amp produces waveforms equal in the size of each rail.
A basic, single transistor amplifier differs from an op amp: 1. The op amp has more gain 2. The op amp may have higher input resistance (so it loads the circuit less) 3. The op amp may have a lower output resistance (so it can drive larger currents) 4. The op amp likely has a lower frequency response (due to the high gain, unless you provide some sort of feedback loop) 5. The op amp is ridiculously complex compared to a simple amplifier 6. The op amp will require a positive and negative voltage (may be unnecessary with a single transistor amplifier)
The main parameter responsible for virtual ground of an Op-Amp is Input Impedance . Generally , for an Op-Amp it is very high . So , we can conclude that the characteristics of an Op-Amp responsible for virtual ground is high input impedance .
op-amp
Feedback in used in an op-amp to limit and control the gain. An op-amp, by itself, has very high gain, often more than 100,000. (A theoretical op-amp has infinite gain.) The external feedback loop forms a divider, more correctly a bridge, that is maintained in balance by the op-amp, giving the desired real gain.
op-amp can be nulled using offset voltage about +/- 1.5 mv to offset pins
This may vary from one op-amp to another, consult the datasheet.
The wording are confusing an op-amp is an op-amp a comparator is another animal. an op-amp can be used as square wave generator by overdriving it but the results are not desirable. However a comparator will be a switch on-off at the set level.