Frequency response of investing op amp
It can be high at low frequencies but decreases rapidly above some frequency which is characteristic of the particular amplifier. At high signal speeds, there is also a limit on the maximum rate of change of the output voltage. This limit is called the slewing-rate limit. These real amplifier characteristics are considered in the next sections. The amplitude-response and phase-response curves for a typical operational amplifier are given in the figure below.
The low-frequency gain of the amplifier is dB, or ,, and the low-frequency phase shift is essentially zero. At some frequency often below 10 Hz as in this case the gain begins to fall off, usually at 6 dB per octave. Frequency response of typical operational amplifier. A very important indicator of operational amplifier performance can be extracted from the figure above by inspection, namely, the gain margin for a particular application.
First note that the gain without feedback is called the open-loop gain, while the gain achieved by the application of feedback is called the closed-loop gain. Some factor or factors cause the bandwidth of the op-amp circuits to be limited. One possible limiting factor is the input capacitance together with the circuit resistors.
However, when bandwidth is limited by input capacitance combined with circuit resistors in models, the models show tell-tale signs, especially an amplitude peak and a sudden degree phase reversal. If the frequency response of a circuit does not appear to have these features, is it reasonable to conclude that some other factor or factors are limiting the bandwidth?
Is it reasonable to conclude that, although the input capacitance may play some role in the frequency response, it does not play the dominant role? Or would that reasoning be faulty? Notice that the 3dB cutoff frequency is around kHz, and notice the 90 degree phase shift.
Notice the peak at about 4kHz and the phase shift. The peak has moved to about kHz. It is wider and with less amplitude, but still quite noticeable. The peak here is almost at the kHz -3dB bandwidth found earlier. If the capacitance is made even smaller, the "peak" will disappear into the roll-off caused by the op-amp's internal compensation capacitor.
With smaller resistors, the same sequence is observed, except at different capacitance values. Now in the next graph, there is NO observable peak. There is a roll-off with a break frequency of around 15kHz. I do not doubt that this initial roll-off is due to capacitance somewhere in the op-amp.
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Frequency response of investing op amp forex brokers with no deposit bonus
Op Amp Frequency Response \u0026 Gain Bandwidth Product
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