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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.
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)
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)
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.
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.
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 advantage of using external compensation for an op amp?
because it helps in noise reduction,bandwidth maximization
Where does the pedal go in the amp?
Gain effects lie overdrive, compressor etc go between the guitar and amp, time based effect eg flange, chorus go in the effects loop.
What is the relationship between a volt an amp and a watt?
A volt is the unit of electric potential, an amp is the unit of electric current, and a watt is the unit of power. The relationship between them is described by the equation: Power (in watts) = Voltage (in volts) x Current (in amps).
Tell you something about op-amp?
An op-amp is a device with two inputs, one inverting and one non-inverting. The output goes to whatever value is needed to make the two inputs the same. This means that, typically, the output is connected to a feedback circuit back into the negative input. This is closed loop, negative feedback operation. Due to the high gain of the op-amp, this configuration makes performance, such as gain and bandwidth, easy to predict.
Frequency compensation techniques in op amp?
This answer is not simple amplifier if the gain is unlimited will tend to oscillate at higherfrequency usually there is a pin out for some amplifiers whereby adding a snub or capacitor will limit this gain internally so it can be stabilized. There is recommended techniques by not a guaranty of stability it depends on the amplifier bandwidth factor Q and grounds and other factors.
