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Why doesn’t Endevco include specifications for Noise and Resolution on datasheets for unamplified<br>piezoresistive accelerometers and pressure sensors?

Question

Why doesn’t Endevco include specifications for Noise and Resolution on datasheets for unamplified piezoresistive accelerometers and pressure sensors?

Answer

Noise - Endevco’s mV output piezoresistive transducers include a MEMS (Micro Electro Mechanical System) sensor, which is provides an output relative to the input voltage and the external stimulus (acceleration or pressure). There are no active electronic components on board which might add their own intrinsic noise, but only the thermal noise of the piezoresistive elements. As such, the noise level is always well below the level of the system you use to measure it. Therefore, noise in your measurement chain comes primarily from the bridge amplifier.

Resolution – Endevco’s mV output piezoresistive transducers are analog with no active electronics or A to D conversion. The theoretical resolution of an analog sensor is infinite, but it will always be limited by the noise floor of the bridge amplifier.