Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma [email protected] 26 th September 2005.
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Transcript of Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma [email protected] 26 th September 2005.
![Page 1: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/1.jpg)
Ambrish VarmaAmbrish Varma 1
Effect of Pin Parasitics on SSN
Ambrish [email protected]
26th September 2005
![Page 2: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/2.jpg)
Ambrish VarmaAmbrish Varma 2
Three Cases
GRND
3.3 V
40 Ω 40 Ω50 Ω
L1
L3
L1
L6
L2L2
► Adapted from Hall, Hall and McCall, “High-Speed Digital System Design,” p.121► Buffers are Arpad’s IBIS class HSPICE design (not IBIS)► Receiver is disabled driver► Transmission line references are universal ground
► GRND is not ”ideal 0” – a DC source with 0 V is placed between “GRND” and 0This slide same as Michael Mirmak’s
![Page 3: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/3.jpg)
Ambrish VarmaAmbrish Varma 3
Case1.options accurate post probe numdgt=10 measdgt=10 ingold .tran 10p 100n* NOTE - "ideal ground node 0" is defined as an effectively* lossless low-impedance ground plane.* Similarly the voltage node 1.5 V is assumed an* effectively lossless low-impedance power plane.Vpwr pwr 0 DC=3.3Vgnd grnd 0 DC=0
Xdriver input drv_out drv_pwr drv_gnd enable IO_buf Xreceiver rcv_pwr rcv_in rcv_pwr rcv_gnd rcv_pwr IO_buf Venable enable drv_gnd DC=0Vinput input drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)
Tdrv drv_bw grnd line_out grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv rcv_bw grnd line_in grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline line_out grnd line_in grnd Z0=50 TD='0.0254*0.180n' L=0.5
Lgnd_drv drv_gnd grnd L=7.5nLline_drv drv_out drv_bw L=9nLpwr_drv drv_pwr pwr L=9n
Lgnd_rcv rcv_gnd grnd L=7.5nLline_rcv rcv_in rcv_bw L=9nLpwr_rcv rcv_pwr pwr L=9n
.print V(pwr,grnd) V(drv_pwr, drv_gnd) V(rcv_in,grnd) V(rcv_in, rcv_gnd)+ I(Vpwr) I(Vgnd).end
![Page 4: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/4.jpg)
Ambrish VarmaAmbrish Varma 4
Case2.options accurate post probe numdgt=10 measdgt=10 ingold .tran 10p 100n* NOTE - "ideal ground node 0" is defined as an effectively* lossless low-impedance ground plane.* Similarly the voltage node 1.5 V is assumed an* effectively lossless low-impedance power plane.Vpwr pwr 0 DC=3.3Vgnd grnd 0 DC=0
Xdriver input drv_out drv_pwr drv_gnd enable IO_buf Xreceiver rcv_pwr rcv_in rcv_pwr rcv_gnd rcv_pwr IO_buf Venable enable drv_gnd DC=0Vinput input drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)
Tdrv drv_bw grnd line_out grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv rcv_bw grnd line_in grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline line_out grnd line_in grnd Z0=50 TD='0.0254*0.180n' L=0.5
Lgnd_drv drv_gnd grnd L=0nLline_drv drv_out drv_bw L=16.5nLpwr_drv drv_pwr pwr L=1.5nK1 Lline_drv Lpwr_drv 0.476731295Lgnd_rcv rcv_gnd grnd L=0nLline_rcv rcv_in rcv_bw L=16.5nLpwr_rcv rcv_pwr pwr L=1.5nK2 Lline_rcv Lpwr_rcv 0.476731295
.print V(pwr,grnd) V(drv_pwr, drv_gnd) V(rcv_in,grnd) V(rcv_in, rcv_gnd)+ I(Vpwr) I(Vgnd).end
![Page 5: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/5.jpg)
Ambrish VarmaAmbrish Varma 5
Case3.options accurate post probe numdgt=10 measdgt=10 ingold .tran 10p 100n* NOTE - "ideal ground node 0" is defined as an effectively* lossless low-impedance ground plane.* Similarly the voltage node 1.5 V is assumed an* effectively lossless low-impedance power plane.Vpwr pwr 0 DC=3.3Vgnd grnd 0 DC=0
Xdriver input drv_out drv_pwr drv_gnd enable IO_buf Xreceiver rcv_pwr rcv_in rcv_pwr rcv_gnd rcv_pwr IO_buf Venable enable drv_gnd DC=0Vinput input drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)
Tdrv drv_bw grnd line_out grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv rcv_bw grnd line_in grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline line_out grnd line_in grnd Z0=50 TD='0.0254*0.180n' L=0.5
Lgnd_drv drv_gnd grnd L=0nLline_drv drv_out drv_bw L=9nLpwr_drv drv_pwr pwr L=9n
Lgnd_rcv rcv_gnd grnd L=15nLline_rcv rcv_in rcv_bw L=9nLpwr_rcv rcv_pwr pwr L=9n
.print V(pwr,grnd) V(drv_pwr, drv_gnd) V(rcv_in,grnd) V(rcv_in, rcv_gnd)+ I(Vpwr) I(Vgnd).end
![Page 6: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/6.jpg)
Ambrish VarmaAmbrish Varma 6
Receiver Input Vs Receiver Ground (rcv_gnd)
Case1
Case2
Case3
![Page 7: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/7.jpg)
Ambrish VarmaAmbrish Varma 7
Receiver Input Vs System Ground (grnd)
Case1
Case2
Case3
![Page 8: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/8.jpg)
Ambrish VarmaAmbrish Varma 8
Case1 – 4 drivers* Case1.options accurate post probe numdgt=10 measdgt=10 ingold .tran 10p 100n* NOTE - "ideal ground node 0" is defined as an effectively* lossless low-impedance ground plane.* Similarly the voltage node 1.5 V is assumed an* effectively lossless low-impedance power plane.Vpwr pwr 0 DC=3.3Vgnd grnd 0 DC=0Xdriver1 input1 drv_out1 drv_pwr drv_gnd enable IO_buf Xdriver2 input2 drv_out2 drv_pwr drv_gnd enable IO_buf Xdriver3 input3 drv_out3 drv_pwr drv_gnd enable IO_buf Xdriver4 input4 drv_out4 drv_pwr drv_gnd enable IO_buf
Xreceiver1 pwr rcv_in1 rcv_pwr rcv_gnd pwr IO_buf Xreceiver2 pwr rcv_in2 rcv_pwr rcv_gnd pwr IO_buf Xreceiver3 pwr rcv_in3 rcv_pwr rcv_gnd pwr IO_buf Xreceiver4 pwr rcv_in4 rcv_pwr rcv_gnd pwr IO_buf
Venable enable drv_gnd DC=0
Vinput1 input1 drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)Vinput2 input2 drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)Vinput3 input3 drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)*Vinput4 input4 drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)Vinput4 input4 drv_gnd DC=0
Tdrv1 drv_bw1 grnd line_out1 grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv1 rcv_bw1 grnd line_in1 grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline1 line_out1 grnd line_in1 grnd Z0=50 TD='0.0254*0.180n' L=0.5
Tdrv2 drv_bw2 grnd line_out2 grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv2 rcv_bw2 grnd line_in2 grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline2 line_out2 grnd line_in2 grnd Z0=50 TD='0.0254*0.180n' L=0.5
![Page 9: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/9.jpg)
Ambrish VarmaAmbrish Varma 9
Cont..Tdrv3 drv_bw3 grnd line_out3 grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv3 rcv_bw3 grnd line_in3 grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline3 line_out3 grnd line_in3 grnd Z0=50 TD='0.0254*0.180n' L=0.5
Tdrv4 drv_bw4 grnd line_out4 grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv4 rcv_bw4 grnd line_in4 grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline4 line_out4 grnd line_in4 grnd Z0=50 TD='0.0254*0.180n' L=0.5
Lgnd_drv drv_gnd grnd L=7.5n
Lline_drv1 drv_bw1 drv_out1 L=9nLline_drv2 drv_bw2 drv_out2 L=9nLline_drv3 drv_bw3 drv_out3 L=9nLline_drv4 drv_bw4 drv_out4 L=9n
Lpwr_drv drv_pwr pwr L=9nLgnd_rcv rcv_gnd grnd L=7.5n
Lline_rcv1 rcv_bw1 rcv_in1 L=9nLline_rcv2 rcv_bw2 rcv_in2 L=9nLline_rcv3 rcv_bw3 rcv_in3 L=9nLline_rcv4 rcv_bw4 rcv_in4 L=9n
Lpwr_rcv rcv_pwr pwr L=9n
.print V(pwr,grnd) V(drv_pwr, drv_gnd) V(rcv_in1,grnd) V(rcv_in1, rcv_gnd)+ V(rcv_in4,grnd) V(rcv_in4, rcv_gnd) I(Vpwr) I(Vgnd).end
![Page 10: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/10.jpg)
Ambrish VarmaAmbrish Varma 10
Case3 – 4 Drivers* Case1.options accurate post probe numdgt=10 measdgt=10 ingold .tran 10p 100n* NOTE - "ideal ground node 0" is defined as an effectively* lossless low-impedance ground plane.* Similarly the voltage node 1.5 V is assumed an* effectively lossless low-impedance power plane.Vpwr pwr 0 DC=3.3Vgnd grnd 0 DC=0Xdriver1 input1 drv_out1 drv_pwr drv_gnd enable IO_buf Xdriver2 input2 drv_out2 drv_pwr drv_gnd enable IO_buf Xdriver3 input3 drv_out3 drv_pwr drv_gnd enable IO_buf Xdriver4 input4 drv_out4 drv_pwr drv_gnd enable IO_buf
Xreceiver1 pwr rcv_in1 rcv_pwr rcv_gnd pwr IO_buf Xreceiver2 pwr rcv_in2 rcv_pwr rcv_gnd pwr IO_buf Xreceiver3 pwr rcv_in3 rcv_pwr rcv_gnd pwr IO_buf Xreceiver4 pwr rcv_in4 rcv_pwr rcv_gnd pwr IO_buf
Venable enable drv_gnd DC=0
Vinput1 input1 drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)Vinput2 input2 drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)Vinput3 input3 drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)*Vinput4 input4 drv_gnd pul(0 3.3 0 100p 100p 7.4n 15n)Vinput4 input4 drv_gnd DC=0
Tdrv1 drv_bw1 grnd line_out1 grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv1 rcv_bw1 grnd line_in1 grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline1 line_out1 grnd line_in1 grnd Z0=50 TD='0.0254*0.180n' L=0.5
Tdrv2 drv_bw2 grnd line_out2 grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv2 rcv_bw2 grnd line_in2 grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline2 line_out2 grnd line_in2 grnd Z0=50 TD='0.0254*0.180n' L=0.5
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Ambrish VarmaAmbrish Varma 11
Cont..Tdrv3 drv_bw3 grnd line_out3 grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv3 rcv_bw3 grnd line_in3 grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline3 line_out3 grnd line_in3 grnd Z0=50 TD='0.0254*0.180n' L=0.5
Tdrv4 drv_bw4 grnd line_out4 grnd Z0=40 TD='0.0254*0.180n' L=0.5Trcv4 rcv_bw4 grnd line_in4 grnd Z0=40 TD='0.0254*0.180n' L=3.3Tline4 line_out4 grnd line_in4 grnd Z0=50 TD='0.0254*0.180n' L=0.5
Lgnd_drv drv_gnd grnd L=0n
Lline_drv1 drv_bw1 drv_out1 L=9nLline_drv2 drv_bw2 drv_out2 L=9nLline_drv3 drv_bw3 drv_out3 L=9nLline_drv4 drv_bw4 drv_out4 L=9n
Lpwr_drv drv_pwr pwr L=9nLgnd_rcv rcv_gnd grnd L=15n
Lline_rcv1 rcv_bw1 rcv_in1 L=9nLline_rcv2 rcv_bw2 rcv_in2 L=9nLline_rcv3 rcv_bw3 rcv_in3 L=9nLline_rcv4 rcv_bw4 rcv_in4 L=9n
Lpwr_rcv rcv_pwr pwr L=9n
.print V(pwr,grnd) V(drv_pwr, drv_gnd) V(rcv_in1,grnd) V(rcv_in1, rcv_gnd)+ V(rcv_in4,grnd) V(rcv_in4, rcv_gnd) I(Vpwr) I(Vgnd).end
![Page 12: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/12.jpg)
Ambrish VarmaAmbrish Varma 12
4 Drivers Switching Receiver Input Vs Receiver Ground (rcv_gnd)
Case1
Case3
![Page 13: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/13.jpg)
Ambrish VarmaAmbrish Varma 13
4 Drivers Switching Receiver Input Vs System Ground (grnd)
Case1
Case3
![Page 14: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/14.jpg)
Ambrish VarmaAmbrish Varma 14
Quiet Line Receiver Input Vs Receiver Ground (rcv_gnd)
Case1
Case3
![Page 15: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/15.jpg)
Ambrish VarmaAmbrish Varma 15
Quiet Line Receiver Input Vs System Ground (grnd)
Case1
Case3
![Page 16: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/16.jpg)
Ambrish VarmaAmbrish Varma 16
Quiet Line Receiver Input Vs Receiver Ground (rcv_gnd)
Case1
Case3
Entire simulation Data
![Page 17: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/17.jpg)
Ambrish VarmaAmbrish Varma 17
Quiet Line Receiver Input Vs System Ground (grnd)
Case1
Case3
Entire simulation Data
![Page 18: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/18.jpg)
Ambrish VarmaAmbrish Varma 18
Quiet Line (with Mutual Inductance) Receiver Input Vs Receiver Ground (rcv_gnd)
Case1
Case3
Entire simulation Data
![Page 19: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/19.jpg)
Ambrish VarmaAmbrish Varma 19
Quiet Line(with mutual Ind.) Receiver Input Vs System Ground (grnd)
Case1
Case3
Entire simulation Data
![Page 20: Ambrish Varma 1 Effect of Pin Parasitics on SSN Ambrish Varma akvarma@ncsu.edu 26 th September 2005.](https://reader035.fdocuments.us/reader035/viewer/2022062500/5697bf891a28abf838c89e55/html5/thumbnails/20.jpg)
Ambrish VarmaAmbrish Varma 20
Mutual Inductance on Case 3 with 4 Drivers
……Lgnd_drv drv_gnd grnd L=0n
Lline_drv1 drv_out1 drv_bw1 L=9nLline_drv2 drv_out2 drv_bw2 L=9nLline_drv3 drv_out3 drv_bw3 L=9nLline_drv4 drv_out4 drv_bw4 L=9n
Lpwr_drv drv_pwr pwr L=9n
K1 Lline_drv1 Lpwr_drv 0.476731295K2 Lline_drv2 Lpwr_drv 0.476731295K3 Lline_drv3 Lpwr_drv 0.476731295K4 Lline_drv4 Lpwr_drv 0.476731295
Lgnd_rcv rcv_gnd grnd L=15n
Lline_rcv1 rcv_bw1 rcv_in1 L=9nLline_rcv2 rcv_bw2 rcv_in2 L=9nLline_rcv3 rcv_bw3 rcv_in3 L=9nLline_rcv4 rcv_bw4 rcv_in4 L=9n
Lpwr_rcv rcv_pwr pwr L=9n……
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Ambrish VarmaAmbrish Varma 21
Conclusions
►Case 1 and Case 3 are not similar.►Quiet Line analysis shows that more the number of
drivers, the more obvious the results get (even with Mutual Inductance).
►Also notable is that in case 3, we keep the inductance equivalent. In actual cases, inductances (or parasitics) need not add up. Hence this is more like ‘best case scenario’.