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Chapter 1 (Extra). Noninverting amplifier:. Where Z in is the open-loop input impedance (internal) of the op-amp (without feedback connection). Inverting amplifier:. Generally, assumed to be R i. Op-amp Impedances. Generally, assumed to be 0.

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op amp impedances

Noninverting amplifier:

Where Zinis the open-loop input impedance (internal) of the op-amp (without feedback connection)

Inverting amplifier:

Generally, assumed to be Ri

Op-amp Impedances

Generally, assumed to be 0

Note that the output impedance has the same form for both amplifiers.

example 5

Determine the input and output impedances of the amplifier in Figure below. The op-amp datasheet gives Zin = 2MΩ, Zout = 75Ω, and Aol = 200,000.

  • Find the closed-loop voltage gain.
Example 5

Answer: (a) Zin(NI)=17.5GΩ, Zout(NI)=8.6mΩ, (b) Acl(NI) = 23.0

example 6

Find the values of the input and output impedances in Figure below. Also, determine the closed-loop voltage gain. The op-amp has the following parameters: Aol = 50,000; Zin = 4MΩ; and Zout = 50Ω

Example 6

Answer: Zin(I)=1.0kΩ, Zout(I)=980mΩ, Acl(I)=-100