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How do I turn a high negative DC voltage into a positive DC voltage around -88v?

I need to do this to be able to measure this across a sense resistor using an LTC2992

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  • \$\begingroup\$ Why not attenuate by voltage divider and invert? Since you will know the total attenuation you will know the true negative voltage. \$\endgroup\$ – cm64 Aug 2 '19 at 17:51
  • \$\begingroup\$ Indeed, though it would be preferable to start with a smaller sense resistor. If your issue is a small voltage range with a large offset you should explain so and give the whole circuit as that is a very different problem. \$\endgroup\$ – Chris Stratton Aug 2 '19 at 19:14
  • \$\begingroup\$ I wanted to make a circuit which is able to test a power supply which I built. I was going to do this by using a mostfet as a voltage controlled resistor and have a sense resistor connected to the drain pin. The power supply has a negative rail which was the problem but its now been solved so I am happy about that. \$\endgroup\$ – trak Aug 3 '19 at 19:57
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I need to do this to be able to measure this across a sense resistor using an LTC2992

The LTC2992 will handle negative power rails: -

enter image description here

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  • \$\begingroup\$ Thanks this will be helpful \$\endgroup\$ – trak Aug 3 '19 at 19:54

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