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)
When the magnitude of Vcc and Vee of op-amp are different the op-amp produces waveforms equal in the size of each rail.
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.
An op amp is made from transistors, resistors and capacitors. It is enclosed in a "chip". A basic instrumentation amp is made of 2 op-amps. you can't have a single op-amp perform as good as a instrumentation amp, although it can perfrom the same task. An i-amp has much better CMMR (common-mode rejection) and a higher input impedance.
Ideal op amp approximations: -no current goes into the positive or negative input of the op amp. -The open loop gain is infinite. -Voltage at positive input is the same as the negative input.
The gain of an op amp varies with frequency. After an op amp reaches the half-power point, the gain falls appreciably. And then once it hits the transition frequency, the op amp no longer provides any gain.
i know that an op amp can be used as an amplifier and a switch, but i want to have more uses of the component or device.
It's an op amp (operational amplifier) with a linear response, meaning that double the input means double the output.