Executing Sample Programs

HCI Measurement Program

Step 5. Applies stress and characterizes the parameters

This step performs the following:

1.Applies the stress, Vdstr and Vgstr, to the valid devices.

Before running the SP_MUX_M program, you must determine the Vdstr (drain stress voltage) by Id-Vds measurement (using setup file IDVD.MES), then edit the SP_MUX_M program to input value of Vdstr. Refer to “Executing the Program” on page 9-27.

2.Performs the interim characterization. This sets up the 4155/4156 by using the PARAM.MES setup file, then measures the parameters (Idlin, Gmmax, Vtext and Vtci) for each device.

3.Judges whether to terminate the stress/interim characterization cycle. This cycle is terminated when total stress time reaches 100,000 sec or when there is no device satisfies all of the following conditions:

Idlin value is within ±10 % of initial value.

Gmmax value is within ±10 % of initial value.

Vtext value is within ±20 mV of initial value.

Vtci value is within ±20 mV of initial value.

If none of these termination conditions has occurred, stress time (duration) is increased, and these 3 steps are repeated. The default cumulative stress times are defined in the program as follows. To change these cumulative stress times, refer to “Modifying the Program” on page 9-35.

Stress

Stress time

Cumulative

 

Stress

Stress time

Cumulative

cycle

stress time

 

cycle

stress time

 

 

 

 

 

 

 

 

 

 

1

10 sec

10 sec

 

8

1000 sec

2000 sec

 

 

 

 

 

 

 

2

10 sec

20 sec

 

9

3000 sec

5000 sec

 

 

 

 

 

 

 

3

30 sec

50 sec

 

10

5000 sec

10000 sec

 

 

 

 

 

 

 

4

50 sec

100 sec

 

11

10000 sec

20000 sec

 

 

 

 

 

 

 

5

100 sec

200 sec

 

12

30000 sec

50000 sec

 

 

 

 

 

 

 

6

300 sec

500 sec

 

13

50000 sec

100000 sec

 

 

 

 

 

 

 

7

500 sec

1000 sec

 

 

 

 

 

 

 

 

 

 

 

Agilent E5250A User’s Guide, Edition 9

9-21

Page 277
Image 277
Agilent Technologies Agilent E5250A Applies stress and characterizes the parameters, Stress Stress time Cumulative Cycle