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High speed, fast settling buffer

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tony_taoyh

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Hi,

Can anybody recommend a high speed operational amplifier circuit for the attached cicuit?
Initial voltagge = 0V
Settled voltage = 1V
The error is about 50uV from the final value.
The settling time is: 2ns

Thanks a lot.
 

I doubt, if it will work with discrete parts, may be on-chip. Fast GHz OP, e.g. THS3201 have a closed-loop output impedance that's mostly inductive (about 10 nH) up to near 1 GHz. The resonant structure can't achieve the requested settling time. Furthermore, these amplifiers have about 0.1% settling errors in the µs timescale due to bad thermal chip design.

Open loop buffers may be a better option in a discrete design, but the gain and offset errors have to be compensated.
 

Hi, FvM,

Thanks.

Is it possible to use LDO for this situation?
 

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