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The Signal Sped Up

Input and Output Voltage Range Issues for High Speed CFAs and FDAs, Insight #2

Michael Steffes
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steve.taranovich
steve.taranovich
10/31/2018 5:51:51 PM
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Re: SPAM
@eldercosta----Sorry, it is so frustrating---I was out of town on business a few days, so I did not catch this----popular sites are so inundated by these nuisance SPAM comments. I try to catch these as soon as I can; and our IT group has to watch all the many online forums we have, so we are doing our best. Be sure that we are doing our best to rid our sites of this 'plague'.

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eldercosta
eldercosta
10/30/2018 6:09:15 AM
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The guy registered just to post SPAM. There should be a way to report SPAM abuse.

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More Blogs from The Signal Sped Up
The most recent VFA FDAs focus on lower power, precision, solutions more aimed at Successive Approximation Register (SAR) and delta sigma ADC support. Those will be focus in this FDA stability discussion - but the concepts are backward compatible to the earliest VFA FDAs.
Here, an updated Loop Gain (LG) simulation approach will be first detailed and then used to show paths into, and out of, low Phase Margin (PM) conditions for a current feedback amplifier.
Emerging issues and paths to improve the Phase Margin (PM) for VFA stages that have slipped into perhaps an unsuitably low margin condition
Probably no single issue faces more high-speed signal path designers (and supplier support teams) than the risk of instability in higher speed op amps and fully differential amplifiers (FDA).
The more recent Fully Differential Amplifiers (FDA) offer both CFA and VFA versionsThe CFA based versions will also have poor DC accuracy while more recent “precision” VFA based FDAs can provide much improved DC accuracy. Those VFA-based FDAs do come with some added DC error sources beyond the typical op amp terms that will be described here
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