If the voltage gain for each input of a summing amplifier with a 4.7 kΩ feedback resistor is unity, the input resistors must have a value ofa.4.7 kΩ divided by the number of inputsb.None of thesec.4.7 kΩd.4.7 kΩ times the number of input
Question
If the voltage gain for each input of a summing amplifier with a 4.7 kΩ feedback resistor is unity, the input resistors must have a value ofa.4.7 kΩ divided by the number of inputsb.None of thesec.4.7 kΩd.4.7 kΩ times the number of input
Solution
The correct answer is c. 4.7 kΩ.
Here's why:
The voltage gain (Av) of an inverting amplifier is given by the ratio of the feedback resistor (Rf) to the input resistor (Rin). In mathematical terms, Av = -Rf/Rin.
In a summing amplifier where the voltage gain for each input is unity (Av = 1), the value of the feedback resistor (Rf) and the input resistor (Rin) must be equal. This is because for Av to be 1, the ratio Rf/Rin must also be 1 (since 1 = 1/1).
Given that the feedback resistor (Rf) is 4.7 kΩ, the input resistors (Rin) must also be 4.7 kΩ for the voltage gain of each input to be unity. Therefore, the correct answer is c. 4.7 kΩ.
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