Operational Apmlifers Flashcards
What is an OP-AMP?
An integrated circuit designed to perform mathematical operations
What range should the output voltage V(o) be in?
-V(cc) <= V(o) <= V(cc)
When is an OP-AMP an inverting amplifier?
When the input voltage is connected to the inverting terminal (-) and the non-inverting terminal is connected to ground
When is an OP-AMP a non-inverting amplifier?
When the input voltage is connected to the non-inverting terminal (+) and the inverting terminal is connected to ground
What is the voltage gain for an inverting amplifier?
Av = -R(2)/[R(1)+R(S)]
What is the voltage gain for a non-inverting amplifier?
Av = 1+ R(2)/R(1)
What is compensation resistance?
The resistance at which the OP-AMP is able to operate making I- = I+ placed at the non-inverting terminal
R(C) = R(1)//R(2)
How do you find the maximum input frequency of an OP-AMP?
To find f(in) so that the output isn’t distorted use
f(in) <= SR/[2piK*|Gain|]
What is the slew rate (SR)?
The maximum possible rate at which the output voltage can change
SR = ΔV(o)/Δt
What is the bandwidth?
The frequency range at which the gain remains constant
What is the formula for bandwidth for an Open-Loop OP-AMP circuit?
BW = f(H) f(H) = Higher cut off frequency
What is the higher cut off frequency f(H)?
The frequency at which the voltage gain drops by 3db from its maximum value
What is the bandwidth formula for a closed-loop OP-AMP circuit?
BW = β*f(T) f(T) = Unity Gain Frequency
What is β for a closed loop OP-AMP circuit?
β = R(1)/[(R(1)+R(2)]
What is the unity gain frequency f(T)?
f(T) = Af(H)
