#L10#L10
Q:How does the HILEVEL Curve Tracer work?
The HILEVEL Curve Tracer
| The fundamental principle of curve
tracing is to map the relationship of injected input current to measured
input voltage (or vice versa) of a target pin, while other pins are either
disconnected or connected to ground.
The HILEVEL Curve Tracer facilitates all of the above with the provision that only one of the other pins will, at a given time, be held to ground (dedicated ground pins are of course held to ground in all cases). However, within the course of the total test, all other pins - one at a time - may be connected to ground. Furthermore, power-pins are usually held to ground unless Power (in the Curve Trace Window) is un-checked, in which case all power pins will be physically disconnected during the test(s). The parameters pertaining to HILEVEL Curve Tracing are specified in a text file which also lists the order and manner in which the pins are to be tested. The following must be specified: Type of Test using the following MACRO commands: $MEASURE {VOLTAGE | CURRENT}; ForceI/measureV
or ForceV/measureI $MIN x.y ;
|
The pins to be tested are listed in one of the following three forms: pin i -> pin j ; test pin i with
pin
j held to 0 volts ; Example of a curve trace program
|
------------ CURVE TRACE DATA ------------------ Measure from Pin 1 to Pin 45 µA = 0.000 50.000 100.000 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 V = 0.021 0.600 0.621 0.631 0.641 0.646 0.651 0.656 0.656 0.662 0.667 0.667 0.672 0.672 0.672 0.677 0.677 0.682 0.682 0.682 0.682 kO = 1000 12.00 6.21 4.21 3.21 2.58 2.17 1.88 1.64 1.47 1.33 1.21 1.12 1.03 0.960 0.903 0.846 0.802 0.758 0.718 0.682 Measure from Pin 21 to Pin 7, then from Pin 7 to Pin 21 µA = 0.000 50.000 100.000 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 V = 0.056 0.636 0.656 0.667 0.677 0.682 0.687 0.692 0.698 0.698 0.703 0.703 0.708 0.708 0.713 0.713 0.713 0.718 0.718 0.718 0.723 kO = 1000 12.72 6.56 4.44 3.38 2.73 2.29 1.98 1.74 1.55 1.41 1.28 1.18 1.09 1.02 0.951 0.891 0.845 0.798 0.756 0.723 V = 0.031 0.615 0.636 0.646 0.651 0.662 0.667 0.667 0.672 0.677 0.677 0.682 0.687 0.687 0.687 0.692 0.692 0.698 0.698 0.698 0.703 kO = 1000 12.31 6.36 4.31 3.26 2.65 2.22 1.90 1.68 1.50 1.35 1.24 1.15 1.06 0.982 0.923 0.865 0.821 0.775 0.734 0.703 Measure from Pin 7 to GND µA = 0.000 50.000 100.000 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 V = 0.000 0.585 0.605 0.615 0.626 0.631 0.636 0.641 0.646 0.646 0.651 0.651 0.656 0.656 0.662 0.662 0.667 0.667 0.667 0.667 0.672 kO = 10000 11.69 6.05 4.10 3.13 2.52 2.12 1.83 1.62 1.44 1.30 1.18 1.09 1.01 0.945 0.882 0.833 0.784 0.741 0.702 0.672
Note that kO implies kOhm, and simply means the relationship between voltage
and current for the particular
measurement - we by no means are dealing with a regular resistor.
An ASCII plot produced for the first of the above measurements is shown
below:
For pin 1 with pin 45 held at 0V (Gnd)
(V)
0.6150 + x
| x··x··x··x··x··x··
| x··x··
| x··
|
|
|
|
| ·
|
0.3125 +
|
| ·
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0.0100 + x
+--------------+--------------+-
0.0 50.0 100.0 (µA)
The x’s signify measurements while the "." are interpolated points (optional).
QL10.zip is a zipped Word file of this Q'nApp.
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