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Engineering Resources

ZMD ASIC Compensated

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PURPOSE: To compare competitor pressure sensors amplified and compensated using the ZMD ASIC to All Sensors pressure sensors using another approach for amplification and compensation.

APPLICATION: Any application where a true pressure signal capture is necessary without distortion by the pressure sensor.

DISCUSSION AS REPORTED:
In each of the pictures below of waveforms captured on a Tektronix oscilloscope the lower waveform is the signal to reproduced by the sensor. The top waveform is the output of the pressure sensor. It is important to note the time scale of each picture to get the true measure of the comparisons.

 

PICTURE 1: DISPLAY: STEP RESPONSE OF A COMPETITORS PRESSURE SENSOR WITH INTERNAL ZMD ASIC COMPENSTATION. TIME SCALE 1 msec/division.

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PICTURE 2: STEP RESPONSE OF AN ALL SENSORS 5 INCH-D1-4V-MINI.
TIME SCALE: 250 usec/division…
CONCLUSION: ALL SENSORS RESPONSE IS ABOUT TEN TIMES FASTER THAN COMPETITORS.

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PICTURE 3: COMPETITOR SENSOR 100 HZ RESPONSE.
NOTE: SIGNIFICANT QUANTIZATION DISTORTION AND A GROUP DELAY OF 3 msec.

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PICTURE 4: COMPETITOR SENSOR 500 HZ RESPONSE.
NOTE: 37 HZ OUTPUT OF THE SENSOR DUE TO ALIASING OF THE INPUT SIGNAL AS A RESULT OF THE ASIC SAMPLING RATE. AGAIN A SIGNIFICANT DISTORTION OF THE SIGNAL.

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PICTURE 5: 500 HZ RESPONSE OF ALL SENSORS PRESSURE SENSOR 5 INCH-D1-4V-MINI.
NOTE: NEGLIGIBLE ATTENTUATION AND A GROUP DELAY OF 200 usec.
CONCLUSION: FOR APPLICATIONS REQUIRING A PRESSURE SENSOR TO PROVIDE A TRUE SIGNAL REPRESENTATION OF THE MEASURED SIGNAL PRESSURE SENSORS WITH ZMD ASIC COMPENSATION WOULD BE UNACCEPTABLE.

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