Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

how to see a short pulse waveform in hspice?

Status
Not open for further replies.

wateror

Member level 4
Joined
Aug 26, 2007
Messages
76
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
1,721
hspice pulse

I applied a pulse voltage to a MOS gate which is:
V2 3 0 PULSE (0 5 29.9995ms 1ns 1ns 100ns 30.0001ms)
After simulation, I used the cscope to watch the waveforms at node 3.
I could only see a vertical line at 29.9995ms instead of a pulse with a width of 100ns.
I have tried to look for answers from option settings, but failed to do that.
pls anyone tell me the solution, it really bothers me a lot.
 

pulse hspice

Would need to see the rest of your code.

It sonds like node 3 is shorted to ground in someway, or something like.
 

post_version=2001 post

this is the nestlist:
*****5t pixel
.LIB "C:\synopsys\water\sm083006-1k.hspice" typical
.LIB "C:\synopsys\water\sm083006-1k.hspice" capacitor
****MOS**
Mrst1 9 1 2 0 NMOS_3P3 W=400n L=350.0n M=1
Mtx 2 6 4 0 NMOS_3P3 W=400n L=350.0n M=1
Mrst2 9 3 4 0 NMOS_3P3 W=400n L=350.0n M=1
Msf 9 4 5 0 NMOS_3P3 W=400n L=350.0n M=1
Msele 5 7 8 0 NMOS_3P3 W=400n L=350.0n M=1
Mbias 8 11 0 0 NMOS_3P3 W=500n L=500.0n M=1
Mbi 11 11 0 0 NMOS_3P3 W=500n L=500.0n M=1
******************************************************
****CAP*****
C1 2 0 120.05f
C2 4 0 120.05f
*******************************************************
*******source*******
Vd 9 0 DC=3.3
V1 1 0 PULSE (0 5 1ms 1ns 1ns 100ns 30.0001ms)
V2 3 0 PULSE (0 5 29.9995ms 1ns 1ns 100ns 30.0001ms)
V3 6 0 PULSE (0 5 30ms 1ns 1ns 100ns 30.0001ms)
V4 7 0 PWL (0 0, 29.9995m 0, 29.9995001m 5, 29.9996m 5, 29.9996001m 0, 30.001m 0, 30.0010001m 5, 30.0011m 5.0, 30.0011001m 0)
Ibias 9 11 8u
Idiode 2 0 2.24p
********************************************
******OPTION******
.OPTION POST=2 POSTTOP=1
*.OPTION LIST RUNLVL=6
.OPTION METHOD=GEAR
.OP
.TRAN 10u 32m
.PRINT TRAN V(2) V(4) V(5) V(8) V(1)
.END
************************************

actually , not only v1 but other pulse waves have the same problem.

Added after 3 hours 53 minutes:

I found it ! set the option post_version=2001!
 

pulse + hspice

try this as pulse source:
v 3 0 pulse(0 5 30m 1n 1n 100m 200ms)
for example.
your duty cycle in near :0.1u/30m~1/30000 !!!!!!
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top