Tagged Questions

1
vote
1answer
229 views

Obtaining an op-amp's open loop gain

I'm trying to obtain an op-amp's open loop DC transfer characteristic curve on an oscilloscope, and from the curve, the open loop gain. Here is an image (from some random website) showing the curve I ...
1
vote
1answer
173 views

op-amp + ADC slow reaction

I have the following schematics: If I have a scope probe on VIN, everything works very well. VIN is an amplification of the input and the ADC reports it very well: good accuracy and no delay. But ...
3
votes
1answer
158 views

input stage (pre opamp) for voltages between 0 and 240V AC

I want to play with a custom DSO design: sub 1MSPS Mostly measuring 0-6V signals Some audio signals Power line signals The hardest thing for me is the power line signals. Sometimes I just want to ...
10
votes
4answers
1k views

Is this a good design & layout of an active differential 'scope probe?

This question is an extension of Homebrew differential 'scope probe. I thought I should make this a new question though. I need to measure a 100Mb/s LVDS signal to check its integrity. I will try to ...
6
votes
1answer
676 views

Homebrew differential 'scope probe

I may be able to get my hands on an old 600MHz LeCroy oscilloscope. However, it doesn't have any probes. Is it feasible to make an active differential probe for it using a high-speed op-amp, like the ...
4
votes
1answer
980 views

How does the input circuit on this oscilloscope manage to accept such a large range of voltages?

I recently bought this ($45!) oscilloscope: http://www.gabotronics.com/development-boards/xmega-xprotolab.htm. Looking at its schematic, I see the circuitry for one of the two analog input channels: ...