Operational amplifiers are used in many applications where a well defined transfer function is needed. In former times they were widely used in analogue computers and simulators.
The ideal op-amp is a phase-inverting voltage amplifier with infinite input impedance, zero output impedance and a very high voltage gain. Practical op-amps like the 741 achieve this very well.
The simplest op-amp circuit is a voltage amplifier with a resistor between the input and output terminals, and a resistor in series with the signal input. The defined voltage gain is the ratio of the two added resistors, feedback resistor divided by the input resistor.
The effect of the feedback resistor and the high voltage gain is to make the input terminal of the op-amp have a very low signal voltage (i.e. the output voltage divided by the intrinsic gain) and that point is called a 'virtual earth'. This allows the circuit to be considered as one in which the current flowing through the input resistor is transferred to the feedback resistor.
Another simple example is to replace the feedback resistor by a capacitor. The current in the input resistor is transferred to the feedback capacitor so that the output voltage is proportional to the charge in the capacitor. Because charge is the time-integral of current, this circuit is called an 'integrator'.
A loop made by two integrators and a phase inverter forms an oscillator. More interestingly it simulates a resonant system in which the damping factor can be controlled by a resistor placed across one of the capacitors. This allows the circuit to simulate the effects of a simple control system, and in this way analogue computers were widely used in the study of stability in control systems.
A comparator is simply an opamp with a certain configuation of external circuitry ( a few components) that make it function as a comparator.
no, the 741 opamp is a monolithic IC.
It is an opamp chip consisting of 8 pins
A practical opamp is designed to approach the characteristics of the ideal opamp as closely as possible. The open loop voltage gain of an ideal opamp is infinite, so while this is actually impossible to achieve practical opamps are built with as high an open loop voltage gain as possible.
An opamp has a ground terminal on one of the pins.
741 opamp
An opamp buffer circuit is one where the input signal is connected to the plus input, and the output is connected to the minus input. Within the performance limitations of the opamp, the output will track the input. The advantage of the buffer circuit is that is presents very little load impedance to the input signal, while providing a low impedance from the output to drive whatever circuitry is connected there.
Possibly Linear, in which case it means analog. The LM324 is an opamp.
opamp is a device used to amplify ac as well as DC input signals. It is called as operational amp becoz it is used to perform all mathematical operations. Symbol of opamp indicates the direction of current.
Feed back resistance plays the vital role of controlling output of the OPAMP. Also surrounding temperatures affects the out put of OPAMP. ANSWER: The gain drives the output to either B+ or B- minus the saturation of the output circuitry
A: Any offset whether is voltage or current is an output error to contend with.
A high CMRR prevents the opamp from passing undesirable common mode signals.