Subject: what is dut? a question to ibis gurus

From: [email-masked] (Nikolai Bannov)
Date: Wed, 11 Mar 1998 17:31:15 -0800

Hi Ibis Gurus,

Could anybody expalain me what is X_dut.

What standard says about ..._dut

|    Keywords:  [Rising Waveform], [Falling Waveform]

|  Sub-Params:  R_dut, L_dut, C_dut

|               The 'fixture' subparameters specify the loading conditions
|               under which the waveform is taken.  The R_dut, C_dut, and
|               L_dut subparameters are analogous to the package parameters
|               R_pkg, C_pkg, and L_pkg and are used if the waveform includes
|               the effects of pin inductance/capacitance.  The diagram below
|               shows the interconnection of these elements.
|
|                      PACKAGE            |   TEST FIXTURE
|       _________                         |
|      |  DUT    |   L_dut   R_dut        | L_fixture  R_fixture
|      |  die    |---@@@@@--/\/\/\--o-----|--@@@@---o---/\/\/\----- V_fixture
|      |_________|                  |     |         |
|                                   |     |         |
|                                   |     |         |
|                            C_dut ===    |        === C_fixture
|                                   |     |         |
|                                   |     |         |
|                                  GND    |        GND
|
|               NOTE:  The use of L_dut, R_dut, and C_dut is strongly
|               discouraged in developing Waveform data from simulation
|               models.  Some simulators may ignore these parameters because
|               they may introduce numerical time constant artifacts.

|               All tables assume that the die capacitance is included.
|               Potential numerical problems associated with processing the
|               data using the effective C_comp for effective die capacitance
|               may be handled differently among simulators.
|-----------------------------------------------------------------------------

So, is it correct that  

--- 1 --- if
L_dut, R_dut, and C_dut are not given, --- then
R_pkg, C_pkg, and L_pkg should be assumed included in place of 
L_dut, R_dut, and C_dut 

--- 2 --- if
L_dut, R_dut, and C_dut are given, --- then
R_pkg, C_pkg, and L_pkg should be ignored 
(and not included in DUT die) in the figuere above

--- 3 ---
C_comp should be ALWAYS added to the circuit
(it is  a part of DUT die)

--- 4 ---
finally, what "dut" stands for ? (acronim, abbreviation, ibis inventor?)

why "use of L_dut, R_dut, and C_dut is strongly discouraged" ?

Thank you very much

Nik

[email-masked]