4
Characteristics, Regulatory, and Safety Information
42
Keysight W2630 Series DDR2 DRAM BGA Probes Installation Guide
RRtap1 Tap1_In _net4577 Rtap
RRtap2 Tap2_In _net4578 Rtap
RRtap3 Tap3_In _net4540 Rtap
TTtap1 _net4577 Aggr_Probe 0 0 Z=Ztap E=360 F='1/(Ttap)'
TTtap2 _net4578 Vic1_Probe 0 0 Z=Ztap E=360 F='1/(Ttap)'
TTtap3 _net4540 Vic2_Probe 0 0 Z=Ztap E=360 F='1/(Ttap)'
.ends W2631_RevA1_Model_NoProbe_SUBCKT
With Logic Probe
**********************************************************************************************************
*** Equivalent Load Model : W2631A/B, W2632A, W2633A/B, and W2634A DDR2 Interposer Probes with Logic Probe Attached
*** June 2007
*** Rev001
***
*** This SPICE subcircuit models the input impedance of the W2631A, W2632A, W2633 and W2634A DDR2
*** interposer probes. This models the effect of the probe loading on the system.
*** This is a 3-line model which includes mutual inductive and capacitive coupling from
*** one aggressing line to two adjacent victim pins (K12 & K13).
*** This model is accurate up to 3GHz for input impedance simulations.
***
*** Port Description:
*** Aggr_Top = Top pad of the interposer for the aggressor line
*** Aggr_Bot = Bottom pad of the interposer for the aggressor line
*** Aggr_Probe = Probe pad along perimeter of the interposer for the aggressor line
*** Vic1_Top = Top pad of the interposer for the Victim #1 line (K12, C12)
*** Vic1_Bot = Bottom pad of the interposer for the Victim #1 line (K12, C12)
*** Vic1_Probe = Probe pad along perimeter of the interposer for the Victim #1 line (K13, C13)
*** Vic2_Top = Top pad of the interposer for the Victim #2 line (K12, C12)
*** Vic2_Bot = Bottom pad of the interposer for the Victim #2 line (K12, C12)
*** Vic2_Probe = Probe pad along perimeter of the interposer for the Victim #2 line (K13, C13)
***
*** NOTE: The probe ground is assumed to be ideal and is labeled node 0
*** NOTE: K23, C23 is negligible
***
*** This model is used to simulate the load of the interposer with a logic analyzer attached
*** using either the E5384A, E5826A, or E5827A adapter cables.
**********************************************************************************************************
.subckt W2631_RevA1_Model_LogicProbe_SUBCKT
+ Aggr_Top Aggr_Bot Aggr_Probe
+ Vic1_Top Vic1_Bot Vic1_Probe
+ Vic2_Top Vic2_Bot Vic2_Probe
.param Rtip=20k
.param Ctip=350f
.param Rterm=75
.param Vterm=0.7
.param Zint=50
.param Tint='(169p)*0.062'
.param Lint='Zint*Tint'
.param Cint='Tint/Zint'
.param K12=0.21
.param K13=0.044
.param C12=6f
.param C13=1f
.param Rtap=150
.param Ctap=5f
.param Ztap=75
.param Ttap='(169p)*0.67'
.param Cpad1=100f
CC10 0 Tap1_In C='Cint/2'
CC11 0 Aggr_Top C='Cint/4'
CC12 0 Aggr_Bot C='Cint/4'
CC20 0 Tap2_In C='Cint/2'
CC21 0 Vic1_Top C='Cint/4'
CC22 0 Vic1_Bot C='Cint/4'
CC30 0 Tap3_In C='Cint/2'
CC31 0 Vic2_Top C='Cint/4'
CC32 0 Vic2_Bot C='Cint/4'
CCcouple12 Tap2_In Tap1_In C=C12
CCcouple13 Tap3_In Tap1_In C=C13
CCpad1 0 Aggr_Probe C=Cpad1
CCpad2 0 Vic1_Probe C=Cpad1
CCpad3 0 Vic2_Probe C=Cpad1