With the aim to combine some good properties of two different opamp types we can make use of the composite amplifier principle (see the figure). For example, we could combine good (small) input off
Multi-loop power control strategy of current source PWM rectifier - ScienceDirect
Proportional–integral–derivative controller - Wikipedia
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Double-loop control of DC-DC boost converter.
Closed-loop control of single-input multi-output isolated DC-DC converter
Two methods for SPICE-based amplifier stability analysis - EDN Asia
Multi-loop Circuits and Kirchoff's Rules
Multi-loop current control strategy based on predictive control for multiphase pulse power supplies
The PID Controller — Part 1
Loop Gain and its Effect on Analog Control Systems
Loop Gain and its Effect on Analog Control Systems