In a certain application, an amplifier is needed to sense the open-circuit volta
ID: 2079017 • Letter: I
Question
In a certain application, an amplifier is needed to sense the open-circuit voltage of a source and force current to flow through a load. The source resistance and load resistance are variable. The current delivered to the load is to be nearly independent of both the source resistance and load resistance. What type of ideal amplifier is needed? If the source resistance varies from 1 k Ohm to 2 k Ohm and this causes a 1% decrease in load current, what is the value of the input resistance? If the load resistance varies from 100 Ohm to 300 Ohm and this causes a 1% decrease in load current, what is the value of the output resistance? Consider whether zero or infinite input resistance would be best for sensing the open-circuit voltage of the source. Consider whether zero or infinite output resistance would be best for making the load current independent of the load resistance.Explanation / Answer
Required amplifier is transconductance amplifier .... Infinite input resistance is the best for sensing open circuit voltage of the source and infinite output resistance is the best for making the load current independent of load resistance.