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're [EE]: Oscilloscope input amplifier designs sou'
2002\09\19@053420 by Russell McMahon

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> It is likely I will need to design a standard scope-type input stage
> (attenuator and amp) at some time in the not too distant future.

Update on requirement:


A typo crept into my earlier e-mail seeking design ideas for a scope
front-end.

The maximum gain setting should be 50 (not 500).  The maximum attenuation
should be 0.02 (not 0.05).  That is the full-scale input ranges (resulting
in 1V output signal) should be as follows:

20mV      G = 50
50mV      G = 20
100mV     G = 10
200mV     G = 5
500mV     G = 2
1V        G = 1
2V        G = 0.5
5V        G = 0.2
10V       G = 0.1
20V       G = 0.05
50V       G = 0.02

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2002\09\19@060418 by Alan B. Pearce

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> It is likely I will need to design a standard scope-type input stage
> (attenuator and amp) at some time in the not too distant future.

I suspect he will need to peruse the offerings of companies like Maxim who
seem to be well up in making high speed op-amps. Another one worth doing
would be Analog Devices, who are also good (like Maxim) at providing
samples, which would probably provide enough devices for the project.

AD may be more likely to have blocks with switchable gain.

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