An amplifier outputs 3.6Vpp into 470 Ohms load when connected to a 420mVpp input signal. When the same signal is feed via a 220 kOhms resistor to the input the output voltage is 2.8Vpp. Calculate the input resistance of the amplifier?
I have done a similar practical exercise in finding the input resistance of a DUT by connecting a variable resistor in between the signal source and the DUT and halved the output using the variable resistor. Whatever value of variable resistance halved the output voltage was my input resistance.
I have done a similar practical exercise in finding the input resistance of a DUT by connecting a variable resistor in between the signal source and the DUT and halved the output using the variable resistor. Whatever value of variable resistance halved the output voltage was my input resistance.