Obtaining test data for a device

1. A method of obtaining test data for a device under test, comprising:

obtaining a first part of the test data by testing the device at first points of a range of parameters using progressive sampling;

wherein obtaining the first part of the test data comprises:

performing the progressive sampling to identify a set of first points;

testing the device at the set of first points to produce first test results; and

performing an interpolation using the first test results to generate grayscale data corresponding to the first part of the test data;

identifying second points in the range of parameters based on the grayscale data, the second points being a predefined grayscale percentage away from a predefined value; and

obtaining a second part of the test data by testing the device at the second points using adaptive sampling.

2. The method of claim 1 , wherein obtaining the first part further comprises:

determining if a number of first points in the set of first points exceeds a threshold; and

if the number of first points in the set does not exceed the threshold, perform progressive sampling, testing and interpolation.

3. The method of claim 2 , wherein, if the number of first points in the set exceeds the threshold, the second part is obtained, wherein obtaining the second part comprises:

performing the adaptive sampling to identify a set of second points;

testing the device at the set of second points to produce second test results; and

performing an interpolation using the second test results to generate the second part of the test data.

4. The method of claim 3 , wherein obtaining the second part further comprises:

setting a metric relating to adaptive sampling;

determining if there are additional points that meet the metric;

performing adaptive sampling to identify another set of second points from the additional points;

testing the device at the other set of second points to produce additional second test results; and

performing an interpolation using the additional second test results to generate part of the test data.

5. The method of claim 3 , further comprising:

specifying parameters that encompass the test data, the parameters defining plural points that include the set of first points and the set of second points;

determining if greater than a predetermined amount of the plural points have been subjected to testing; and

if greater than the predetermined amount of the plural points have not been subjected to testing, obtaining a third part of the test data by testing the device at third points identified using progressive sampling.

6. The method of claim 1 , further comprising:

performing an interpolation using the second part of the test data to obtain missing parts of the test data; and

displaying the test data using the first and second parts and the missing parts.

7. The method of claim 1 , wherein the parameters define a grid having first and second dimensions, the first dimension corresponding to a first parameter relating to the device and the second dimension corresponding to a second parameter relating to the device.

8. The method of claim 1 , wherein the device comprises a semiconductor device and the test data is represented as a shmoo plot.

9. One or more machine-readable media configured to store instructions, which are executable, for use in obtaining test data for a device under test, the one or more machine-readable media being tangible media, the instructions for causing at least one machine to perform the following functions:

obtaining a first part of the test data by testing the device at first points of a range of parameters using progressive sampling;

wherein obtaining the first part of the test data comprises:

performing the progressive sampling to identify a set of first points;

testing the device at the set of first points to produce first test results; and

performing an interpolation using the first test results to generate grayscale data corresponding to the first part of the test data;

identifying second points in the range of parameters based on the grayscale data, the second points being a predefined grayscale percentage away from a predefined value; and

obtaining a second part of the test data by testing the device at the second points using adaptive sampling.

10. The one or more machine-readable media of claim 9 , wherein obtaining the first part further comprises:

determining if a number of first points in the set of first points exceeds a threshold; and

if the number of first points in the set does not exceed the threshold, perform progressive sampling, testing and interpolation.

11. The one or more machine-readable media of claim 10 , wherein, if the number of first points in the set exceeds the threshold, the second part is obtained, wherein obtaining the second part comprises:

performing the adaptive sampling to identify a set of second points;

testing the device at the set of second points to produce second test results; and

performing an interpolation using the second test results to generate the second part of the test data.

12. The one or more machine-readable media of claim 11 , wherein obtaining the second part further comprises:

setting a metric relating to adaptive sampling;

determining if there are additional points that meet the metric;

performing adaptive sampling to identify another set of second points from the additional points;

testing the device at the other set of second points to produce additional second test results; and

performing an interpolation using the additional second test results to generate part of the test data.

13. The one or more machine-readable media of claim 11 , wherein the instructions are also for causing the at least one machine to perform the following functions:

specifying parameters that encompass the test data, the parameters defining plural points that include the set of first points and the set of second points;

determining if greater than a predetermined amount of the plural points have been subjected to testing; and

if greater than the predetermined amount of the plural points have not been subjected to testing, obtaining a third part of the test data by testing the device at third points identified using progressive sampling.

14. The one or more machine-readable media of claim 9 , wherein the instructions are also for causing the at least one machine to perform the following functions:

performing an interpolation using the second part of the test data to obtain missing parts of the test data; and

displaying the test data using the first and second parts and the missing parts.

15. The one or more machine-readable media of claim 9 , wherein the parameters define a grid having first and second dimensions, the first dimension corresponding to a first parameter relating to the device and the second dimension corresponding to a second parameter relating to the device.

16. The one or more machine-readable media of claim 9 , wherein the device comprises a semiconductor device and the test data is represented as a shmoo plot.