Noninverting Amplifier, the op-amp parameters are given as follows:
A = 200,000, Zin = 1MΩ and Zout=100Ω.
Calculate the amplifier input impedance (with negative feedback).
rf =47kΩ
ri = 1.0kΩ
a) 1kΩ
b) 2 MΩ
c)4.26 GΩ
d) 100GΩ
To calculate the amplifier input impedance (Zin) with negative feedback, we can use the following formula:
Zin = (1 + A) * ri
Given that A = 200,000 and ri = 1.0kΩ, we can substitute these values into the formula:
Zin = (1 + 200,000) * 1.0kΩ
Zin = 201,000kΩ or 201MΩ
Therefore, the amplifier input impedance (with negative feedback) is approximately 201 MΩ.
So, the answer is:
b) 2 MΩ