Resistance Chip?
Resistance Chip?
(OP)
Are there an off-the-shelf ICs which can measure resistance. I need to measure in the 0.1 to to 2 milli-W range.
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RE: Resistance Chip?
> you'd need a 4-point Kelvin connection to eliminate the impact of lead and contact resistance, which pretty much precludes most IC's that I can think of.
> you'd need some fairly substantial current, e.g., on the order of tens of milliamps just to get voltage drop into the microvolt range, which is where what your accuracy requirements become important.
> i've seen lots of micro-ohmmeters, but nothing yet in an IC format.
TTFN
RE: Resistance Chip?
I am content with the device reading a starting resistance and merely giving values relative to that value afterwards.
RE: Resistance Chip?
TTFN
RE: Resistance Chip?
RE: Resistance Chip?
How much power available?
What kind of output allowable?
TTFN
RE: Resistance Chip?
By the way, inductance and capacitance appear +/- 90 degrees in the result so these parameters are measured if they are the dominant parameter.
David Stephens
http://www.inventgineering.com/
RE: Resistance Chip?
I would like a digital output from the chip.
RE: Resistance Chip?
That's why 1 amp sounds like the most plausible value, since it results in 100 uV of voltage change, which is well above the noise and drift floor.
TTFN