Eliminating Oscillation in Power Analog Designs
When integrating analog drivers, designers are often faced with unwanted oscillation caused by instability. This white paper describes simple techniques for managing gain and phase relationships to maintain a stable circuit.
In this white paper, we discuss Loop Stability and examine the following issues: Why capacitive loads create stability problems in standard op amp circuits; Closed loop gain (1/ß) and open loop gain and their relationships to stability; How capacitors impact the open loop gain curve; Three ways to adjust the closed loop gain and the open loop gain responses to regain phase margin and stability, along with the advantages and disadvantages of each technique.
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