[SOLVED] SRAM butterfly curve

[warlocklw]

SRAM butterfly curve - HSPICE / CosmosScope

Greetings. I wish to ask for method to create butterfly curve. It's V(q) vs V(qb). When I use DC analysis, I can sweep voltage q and observe voltage at qb, but the voltage q will be a linear increase straight line. If I were to observe the transition of q and qb, i will have to use transient analysis. How do I create a v(q) vs v(qb) butterfly curve? Thanks in advanced.
_________________________________________________________________________________________________________________________________________________
SRAM4
.option abstol=1e-6 reltol=1e-6 post ingold

.hdl "bsimcmg.va"
.include "modelcard.nmos"
.include "modelcard.pmos"

.global vdd!
.param vdd=1
Vvdd! vdd! gnd dc=vdd

* --- Source ---
VWL vWL gnd dc=0
Vqq q gnd

* --- Inverter Subcircuit ---
.subckt inverter vin vout vddi vss
Xp1 vout vin vddi vddi pmos1 TFIN=15n L=30n NFIN=10
Xn1 vout vin vss vss nmos1 TFIN=40n L=30n NFIN=10
.ends

* --- 1 unit SRAM ---
Xinv_top qb q vdd! 0 inverter
Xinv_bot q qb vdd! 0 inverter

* --- Access Transistor ---
Xn5 qb vWL BLB gnd nmos1 TFIN=20n L=30n NFIN=10
Xn6 q vWL BL gnd nmos1 TFIN=20n L=30n NFIN=10

* --- Analysis ---
.dc Vqq 0 1 0.01
.print dc v(q) v(qb)
.end

 

[warlocklw]

Well I found a solution for it. Thanks.

 

[Zankrut]

which version of Spice you follow?
Because I am with Hspice 2008 version, will this FinFET configuration work for it?

 

[sushilnet]

What is the solution.
How you have created that plot

 

[bhanu.somisetty]

Greetings..

can please help me,draw butterfly curve,iam doing project on SRAM

thanks
bhanu

 

[warlocklw]

Re: SRAM butterfly curve - HSPICE / CosmosScope

Greetings. I wish to ask for method to create butterfly curve. It's V(q) vs V(qb). When I use DC analysis, I can sweep voltage q and observe voltage at qb, but the voltage q will be a linear increase straight line. If I were to observe the transition of q and qb, i will have to use transient analysis. How do I create a v(q) vs v(qb) butterfly curve? Thanks in advanced.
_________________________________________________________________________________________________________________________________________________
SRAM4
.option abstol=1e-6 reltol=1e-6 post ingold

.hdl "bsimcmg.va"
.include "modelcard.nmos"
.include "modelcard.pmos"

.global vdd!
.param vdd=1
Vvdd! vdd! gnd dc=vdd

* --- Source ---
VWL vWL gnd dc=0
Vqq q gnd

* --- Inverter Subcircuit ---
.subckt inverter vin vout vddi vss
Xp1 vout vin vddi vddi pmos1 TFIN=15n L=30n NFIN=10
Xn1 vout vin vss vss nmos1 TFIN=40n L=30n NFIN=10
.ends

* --- 1 unit SRAM ---
Xinv_top qb q vdd! 0 inverter
Xinv_bot q qb vdd! 0 inverter

* --- Access Transistor ---
Xn5 qb vWL BLB gnd nmos1 TFIN=20n L=30n NFIN=10
Xn6 q vWL BL gnd nmos1 TFIN=20n L=30n NFIN=10

* --- Analysis ---
.dc Vqq 0 1 0.01
.print dc v(q) v(qb)
.end

Solution, check journal below:
https://www.hindawi.com/journals/jnm/2014/820763/

 

[samira 1990]

Hello
can please help me,draw butterfly curve,iam doing project on SRAM
i want write netlist sram in write mode please help me

thanks