As noted, the operating temperature range may be quite different that the temperature range used for specifying the performance capabilities of the sensor.
Hello, I was following the lecture on the piezoresistive sensors compensation. Can you please tell me if there are designs matching a use in the high frequency range. I am looking for a solution for a piezoresistive sensor working in the frequency range up to 1MHz. Thank you in advance for any advice. Best regards, Libor
This goes well beyond the frequency range that I have been involved with. One of the problems with piezoresistive MEMS sensors is that a gel is used to protect the diaphragm and resistive elements. This can cause considerably damping at high frequencies.
thank you, but I was unable to listen to the lecture. It seems that IT may have blocked the site. I can't listen to the archives either. I'll try tonigth at home
Hello, I was following the lecture on the piezoresistive sensors compensation. Can you please tell me if there are designs matching a use in the high frequency range. I am looking for a solution for a piezoresistive sensor working in the frequency range up to 1MHz. Thank you in advance for any advice. Best regards, Libor
Also - the "zero trim" resistors are in a position I normally expect to be for gain trims. For zero trim I would expect the resistors to be connected to the signal leads.
I hoped I addressed this in the tuorial since it was posted beforehand.
It is common to add external zero trim adjustment on load cells. The span ajust is one or two resistors on the excitation. When two are used they are installed with one on the plus & minus excitation leads to keep the bridge symetrical and reduce cell interaction when used in multi-cell applications..
In reality there are two camps on bridge span trimming - they sceond school of thought is to put a variable resistor between signal leads and sprinkle isolation resistors around the bridge if used in multi-cell applications.
@mark.brown - Perhaps Slide 9 needs a "band-gap device" between the 2 arms.
Looks like some kind of wheatstone 4-arm device, in which case, you can't get at those internal resistances, so you are really only left with tweaking the ratio of the zero trim resistors for centering the (zero) offset between the 2 arms. I guess you also pad the internal resistances with external parallel resistances for the same effect, but I bet that won't do a lot for your linearity/range/ temp compensation.
Also - the "zero trim" resistors are in a position I normally expect to be for gain trims. For zero trim I would expect the resistors to be connected to the signal leads.
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