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Can a limiter be used as a normal amplifier?
As expected, then, the limiter is just a normal amplifier as long as the output is not high or low enough to provoke its limiting functionality. As the output increases, though, the voltage at the anode of D2 starts to increase relative to the voltage at the op-amp’s inverting input terminal.
What’s the maximum voltage you can get from an opamp?
The idea for current limiting is to force the opamp to output the correct voltage to control the MOSFET. So the maximum voltage possible is somewhere around 12v. The idea is to have a negative feedback to a certain voltage and have a positive feedback before a sense resistor.
What happens when the output of an op-amp increases?
As the output increases, though, the voltage at the anode of D2 starts to increase relative to the voltage at the op-amp’s inverting input terminal. Eventually the voltage across the diode will reach ~0.6 V, and the diode will begin to conduct.
What’s the maximum voltage for a current limiting amplifier?
So the maximum voltage possible is somewhere around 12v. The idea is to have a negative feedback to a certain voltage and have a positive feedback before a sense resistor. For example in the following example, I wanted to current limit the load at 3A with a resistor of 0.1 Ohm.
How to limit the amplitude of amplified output?
Nonetheless, the general idea is similar: provide an amplified output that, for the entire range of possible input amplitudes, stays within the dynamic range of the downstream circuit.
How is a limiter different from an AGC circuit?
It is basically a more straightforward way of implementing automatic gain control (AGC), though a limiter is not called an AGC circuit and for good reason—AGC uses feedback to ensure that the output signal always has a certain amplitude, whereas a limiter merely ensures that the output doesn’t exceed a certain amplitude.