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Michael Steffes

Improving Phase Margin for Highly Reactive Rail-to-Rail Output Stage Impedances in Op Amp and Fully Differential Amplifier Applications

Michael Steffes
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Modern high-speed op amps and Fully Differential Amplifiers (FDAs) push the limits in every direction to deliver the best harmonic distortion at the lowest quiescent power. This often leads to relatively low phase margin designs in what would normally appear to be benign application circuits.
The differential outputs provided by fully differential amplifiers (FDA) can be used in a positive feedback scheme to generate a partially active output impedance
A recent >30MHz active filter design will be described here and updated to more accurately fit the desired response shape.
Include the op amp gain bandwidth product in the Rauch low-pass active filter performance equations
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