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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.
The voltage gain of an op-amp is unity at the what?
unity-gain frequency
What is the difference between 10 amp and 15 amp?
what is the diference between 12V 15A DC coil & 12V 10 amps DC coil
What is difference between 5 amp and 15 amp plug points?
Current carrying capacity is different.
When did Andre Marie ampere invent the ampere?
Andre Ampere didn't 'invent' the ampere. The unit for current was named many years after the death of Ampere, in his honour. The ampere is defined in terms of its magnetic effect -i.e. the resulting force between two, parallel, current-carrying conductors. It was Ampere who discovered the relationship between current and force.
How gain varies with bandwidth in an op-amp?
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.
Why gain rolls off at high frequency in op-amp?
Gain rolls off at high frequencies in op-amps primarily due to the internal capacitances and the finite bandwidth of the amplifier. As frequency increases, the phase shift introduced by these capacitances can lead to reduced gain, a phenomenon described by the gain-bandwidth product. Additionally, the feedback network and the op-amp's output impedance can further contribute to this roll-off. Overall, these factors limit the op-amp's ability to maintain its gain at higher frequencies.
What is rolloff in an op-amp circuit?
op-amp rolloff is an inherent low pass filter built into op-amp chips. Because op-amps have such a high gain, they are prone to breaking into high-frequency oscillation; therefore limiting the gain by frequency with a built in low pass filter helps stop this from happening. Imagine a super small signal is leaking into an op amp, because of the high gain it becomes no longer negligible and we have a high frequency signal when the output should be zero. The low pass filter lowers the gain at these High frequencies. Now, this will naturally create gain limits when designing circuits, forcing an upper bandwidth. This is adjusted for by lowering the gain you design into your circuit for the bandwidth you are dealing with (which is one of many reasons we build multi-stage amplifiers)
What is an Op amp Circuit?
op-amp rolloff is an inherent low pass filter built into op-amp chips. Because op-amps have such a high gain, they are prone to breaking into high-frequency oscillation; therefore limiting the gain by frequency with a built in low pass filter helps stop this from happening. Imagine a super small signal is leaking into an op amp, because of the high gain it becomes no longer negligible and we have a high frequency signal when the output should be zero. The low pass filter lowers the gain at these High frequencies. Now, this will naturally create gain limits when designing circuits, forcing an upper bandwidth. This is adjusted for by lowering the gain you design into your circuit for the bandwidth you are dealing with (which is one of many reasons we build multi-stage amplifiers)
How do you find bandwidth of in multistage amplifire?
Its bandwidth is determined by the narrowest one within any stage. E.g. If the preamp's is 5MHz and the power amp is 500kHz, then the total bandwidth of the system will be 500kHz.
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 factors that affect the electrical parameters of an op amp?
The electrical parameters of an operational amplifier (op amp) are influenced by several factors, including temperature, supply voltage, and load conditions. Additionally, the characteristics of the internal transistors, such as their gain and bandwidth, play a significant role. The feedback network and external components also affect parameters like input impedance, output impedance, and bandwidth. Lastly, manufacturing variations and the op amp's design specifications can lead to differences in performance across different units.
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.
The voltage gain of an op-amp is unity at the what?
unity-gain frequency
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.
What is the advantage of using external compensation for an op amp?
because it helps in noise reduction,bandwidth maximization
