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Non-ideal Operational Amplifiers and Feedback Amplifier Stability - Coggle…
Non-ideal Operational Amplifiers and Feedback Amplifier Stability
Classic Feedback Systems
Closed-loop Gain Analysis
Definition of loop gain T=AβT
Ideal vs actual gain deviations
Importance of gain stability
Gain Error
Fractional gain error formula
Impact of large loop gain
Design implications
Nonideal Op-Amp Behavior
Finite Open-loop Gain
Effect on inverting amplifier
Impact on non-inverting amplifier gain
Loop gain dominance
Nonzero Output Resistance
Calculations for output resistance
Influence on amplifier performance
Approximation for practical design
Finite Input Resistance
Differences for inverting vs non-inverting amps
Dependence on loop gain
Feedback Circuits Overview
Series and Shunt Feedback Circuits
Types: Series-shunt, Shunt-shunt, Series-series, Shunt-series
Impedance modification: Increase or decrease
Applications in different amplifiers
Feedback Amplifier Categories
Voltage Amplifiers: High input resistance, low output resistance
Transimpedance Amplifiers: Current to voltage conversion
Current Amplifiers: Input and output current considerations
Feedback Stability Analysis
Phase and Gain Margins
Nyquist and Bode plot interpretations
Importance of stability criteria
Examples and calculations
Frequency Response
Bandwidth limitations due to feedback
Slew rate impact
Stability vs performance trade-offs
Applications and Design Techniques
SPICE Simulation
Closed-loop gain characterization
Resistance and error modeling
Feedback circuit validation
Practical Feedback Design
Resistor tolerances
Manual vs automated adjustment