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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> sense resistance change https://designers-guide.org/forum/YaBB.pl?num=1152374463 Message started by avlsi on Jul 8th, 2006, 9:01am |
Title: sense resistance change Post by avlsi on Jul 8th, 2006, 9:01am hi, I would like to know the various methods to sense resistance change between 1 Mega Ogm to 30 Mega Ohm. It should be able to sense a change of 1% or below. Please tell me how to find things on this. Thanks in advance |
Title: Re: sense resistance change Post by schmitt on Jul 20th, 2006, 2:51am Hi, Probably you can pump a known current and sense the voltage drop across the resistance. There can be some feedback loop which generates an error voltage by comparing the voltage drop with a fixed reference. This error voltage in turn could be used to minimize resistance variation. |
Title: Re: sense resistance change Post by matthewliao on Jul 21st, 2006, 3:26am or you can use a sample resistance in series of your resistance ; to ensure the accuracy, you can measure both the votages of the sample resistance and your resistance. |
Title: Re: sense resistance change Post by loose-electron on Aug 1st, 2006, 7:36pm 1 Meg to 30 Meg... Yikes! I do not know what you are trying to do, but if that is a resistance on a PCB, it is going to be sensitive to dust and humidity. It won't pass the "damp finger test" ;D for a robust board design. If that is a resistance inside a chip, unless it is a specialized process, it will get swamped due to leakage to bulk effects. What are you trying to do here? thanks, Jerry |
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