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Why open loop gain of op-amp is very high?
A; An ideal op amp should have infinite open loop gain so when the loop is closed with negative feedback it will be stable
What is the difference between open loop and closed loop gains of an op amp?
A: Usually by looking at the specification for that op-amp and there will be accuracy deviation from device to device. To use it open loop is practically impossible all it tells from specification that there will be enough gain when the loop is closed and the max frequency available
The voltage gain of an op-amp is unity at the what?
unity-gain frequency
What effect does resister tolerance have on a measured value of circuit current?
A: One example is the gain of an op amp the gain is strictly related to resistors in a closed loop. The gain will change % wise as the resistor change % wise
How does 'closed loop' operation change the performance of an OP AMP?
'Closed loop' operation in an operational amplifier (op-amp) significantly enhances its performance by stabilizing gain and improving bandwidth. In this configuration, feedback is applied from the output to the inverting input, which reduces the overall gain but increases linearity and reduces distortion. It also allows for better control of the output, making the op-amp less sensitive to variations in input signal and power supply, thus improving accuracy and consistency in signal processing.
Does an open loop gain of an op-amp change with a variation of the resistors and transistors inside the IC?
It could do, which is why an op-amp is made with a very high open-loop gain so that the actual gain can be closely controlled by the passive feedback components.
What is negative feedback of a closed loop system?
Negative feedback is a feedback where it is used in negative side in a closed loop system.Such as a inverting side feedback in op-amp.
What makes closed-loop op amp unstable?
A: It does not. The loop becomes unstable ONLY if there is positive feedback either voltage or phase. For a close loop to be stable negative feedback is required.
Why feedback is used in 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.
Why is it necessary to reduce the gain of an op-amp from its open-loop value?
Reducing the gain of an op-amp from its open-loop value is necessary to achieve stable and predictable performance in real-world applications. Open-loop gain is typically very high, leading to potential instability and saturation of the output signal in response to small input changes. By using feedback to lower the gain, the op-amp can operate in a linear region, allowing for precise amplification and improved linearity, bandwidth, and overall circuit stability. This controlled gain also helps in minimizing distortion and enhancing the reliability of the signal processing.
What is the approximate gain of an op-amp open loop?
It is between 100,000 and 1,000,000 and even more. In dB, it is between 100dB to 120dB.
What are the ideal op-amp approximations?
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.
