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Non-Ideal OpAmps and Feedback Systems - Coggle Diagram
Non-Ideal OpAmps and Feedback Systems
Classic Feedback systems
Components
amplifier with transfer function
A(s)
Feedback Network
transfer function
B(s)
Summing Block
Sigma
Closed Loop Gain Analysis
Closed Loop Gain
A_v
Open Loop Gain
A
Loop Gain
Loop Transmission
T = AB
Ideal Gain
A_vIdeal
Gain Error
GE = (IG - AG)/ IG
(Ideal gain - Actual Gain) / Ideal Gain
Analysis Of Circuits with NONIdeal OpAmps
Finite Open-Loop Gain
Non-Inverting Amp
B = Feedback Factor
Fraction of the output voltage that is fed back to the input
V_o = Feedback voltage gain
V_out / V_in
Inverting Amp
V_o = AV
id = -Av
V_o = 0
v_i(R2/(R1+R2))
V_i = 0
v_o(R1/(R1+R2))
Unified Approach to Feedback Amp Gain
T determines feedback amp stability
Closed-Loop Gain Analysis
A_x = A_xideal(T/(1+T))
Resistance Calculations
Blackman's Theorem
R_x = R_xD( (1+T_sc)/(1+T_oc)))
OC = open circuit
SC = short circuit