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2. Operational amplifier - Wikipedia

   en.wikipedia.org/wiki/Operational_amplifier

   The result is that it can operate in many applications with the negative supply pin on the op amp being connected to the signal ground, thus eliminating the need for a separate negative power supply. The LM324 (released in 1972) was one such op amp that came in a quad package (four separate op amps in one package) and became an industry standard.

3. Input offset voltage - Wikipedia

   en.wikipedia.org/wiki/Input_offset_voltage

   The input offset voltage is a parameter defining the differential DC voltage required between the inputs of an amplifier, especially an operational amplifier (op-amp), to make the output zero (for voltage amplifiers, 0 volts with respect to ground or between differential outputs, depending on the output type).

4. Asymptotic gain model - Wikipedia

   en.wikipedia.org/wiki/Asymptotic_gain_model

   See Figure 2. The asymptotic gain model is a special case of the extra element theorem. Figure 2: Possible equivalent signal-flow graph for the asymptotic gain model. As follows directly from limiting cases of the gain expression, the asymptotic gain G ∞ is simply the gain of the system when the return ratio approaches infinity:

5. Miller theorem - Wikipedia

   en.wikipedia.org/wiki/Miller_theorem

   The op-amp inverting amplifier is a typical circuit, with parallel negative feedback, based on the Miller theorem, where the op-amp differential input impedance is apparently decreased to zero Zeroed impedance uses an inverting (usually op-amp) amplifier with enormously high gain A v → ∞ {\displaystyle A_{v}\to \infty } .

6. Power supply rejection ratio - Wikipedia

   en.wikipedia.org/wiki/Power_supply_rejection_ratio

   [3] [4] [5] An ideal op-amp would have infinite PSRR, as the device should have no change to the output voltage with any changes to the power supply voltage. The output voltage will depend on the feedback circuit, as is the case of regular input offset voltages.

7. Op amp integrator - Wikipedia

   en.wikipedia.org/wiki/Op_amp_integrator

   Referring to the above diagram, if the op-amp is assumed to be ideal, then the voltage at the inverting (-) input is held equal to the voltage at the non-inverting (+) input as a virtual ground. The input voltage passes a current V in / R 1 {\displaystyle V_{\text{in}}/{R_{1}}} through the resistor producing a compensating current flow through ...

8. Operational amplifier applications - Wikipedia

   en.wikipedia.org/wiki/Operational_amplifier...

   where Z dif is the op-amp's input impedance to differential signals, and A OL is the open-loop voltage gain of the op-amp (which varies with frequency), and B is the feedback factor (the fraction of the output signal that returns to the input). [3] [4] In the case of the ideal op-amp, with A OL infinite and Z dif infinite, the input impedance ...

9. Gain–bandwidth product - Wikipedia

   en.wikipedia.org/wiki/Gain–bandwidth_product

   For transistors, the current-gain–bandwidth product is known as the f T or transition frequency. [4] [5] It is calculated from the low-frequency (a few kilohertz) current gain under specified test conditions, and the cutoff frequency at which the current gain drops by 3 decibels (70% amplitude); the product of these two values can be thought of as the frequency at which the current gain ...