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Michael Steffes
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Improving Phase Margin for Highly Reactive Rail-to-Rail Output Stage Impedances in Op Amp and Fully Differential Amplifier Applications
Michael Steffes  
9/7/2018   Post a comment
Modern Rail-to-rail (R-R) output stage op amps, or fully differential amplifiers (FDAs), can sometimes get into a low phase margin condition for relatively simple circuits. Using the phase margin simulation test of Reference 1, a few simple external phase margin improvement methods will be shown. These tests and fixes are best done in simulation prior to board layout. Where the device model for a R-R output device is perhaps not including the higher frequency reactance, places for these tuning elements might be put into the board layout as a hedge against future stability problems.
Extracting Loop Gain and Phase Information from Simulation
Michael Steffes  
8/9/2018   7 comments
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.
Implementing an active output impedance to improve system performance in a differential precision SAR ADC driver
Michael Steffes  
5/7/2018   Post a comment
The differential outputs provided by fully differential amplifiers (FDA) can be used in a positive feedback scheme to generate a partially active output impedance
Designing higher frequency active filters to drive differential input high-speed ADCs
Michael Steffes  
4/3/2018   Post a comment
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
Michael Steffes  
2/8/2018   Post a comment
Include the op amp gain bandwidth product in the Rauch low-pass active filter performance equations
Measuring & Modeling Wideband Baluns for Application to ADC Input Stages
Michael Steffes  
2/11/2013   3 comments
Wideband baluns are ubiquitous in ADC evaluation hardware and end-system application. Each high-speed ADC vendor seems to have its default selections from either empirical or legacy practices.




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