Requires: SmartSpice & Smartview

Minimum Versions: SMARTSPICE 4.6.5.R

Run the input deck simulats an Operational Amplifier with .AC and .NOISE analysis. This demonstrates grouping parameters to change together rather than single parameters. Rubberband transistor geometries m*[l],m*[w] to vary both the width and length of devices and see the change in performance.

Graphics

Input Files

rubberband_example_05.in

* Schematic name: opamp
* Rubberband parameters:
* m1[l] m1[w] m2[l] m2[w] m3[l] m3[w] m4[l] m4[w] m5[l] m5[w] m6[l] m6[w]

C1 NET4 GND 5p
I1  net5  NET6 DC 10u
M1 NET3 NET2 NET1 GND nch L=1u W=10u
M2 NET4 NET4 NET1 GND nch L=1u W=10u
M3 NET1 NET6 GND GND nch L=1u W=10u M=2
M4 NET3 NET3 NET5 NET5 pch L=2u W=10u
M5 NET4 NET3 NET5 NET5 pch L=2u W=10u
M6 NET6 NET6 GND GND nch L=1u W=2u

.model nch NMOS
+VERSION=3.1
+Level=        49
+Tnom=27.0
+RDC=10 RSC=10
+Nch= 2.498E+17  Tox=9E-09 Xj=1.00000E-07
+Lint=9.36e-8 Wint=1.47e-7
+Vth0= .6322    K1= .756  K2= -3.83e-2  K3= -2.612 
+Dvt0= 2.812  Dvt1= 0.462  Dvt2=-9.17e-2 
+Nlx= 3.52291E-08  W0= 1.163e-6 
+K3b= 2.233 
+Vsat= 86301.58  Ua= 6.47e-9  Ub= 4.23e-18  Uc=-4.706281E-11 
+Rdsw= 650  U0= 388.3203 wr=1
+A0= .3496967 Ags=.1    B0=0.546    B1= 1   
+ Dwg = -6.0E-09 Dwb = -3.56E-09 Prwb = -.213
+Keta=-3.605872E-02  A1= 2.778747E-02  A2= .9 
+Voff=-6.735529E-02  NFactor= 1.139926  Cit= 1.622527E-04 
+Cdsc=-2.147181E-05   
+Cdscb= 0  Dvt0w =  0 Dvt1w =  0 Dvt2w =  0 
+ Cdscd =  0 Prwg =  0 
+Eta0= 1.0281729E-02  Etab=-5.042203E-03 
+Dsub= .31871233 
+Pclm= 1.114846  Pdiblc1= 2.45357E-03  Pdiblc2= 6.406289E-03 
+Drout= .31871233  Pscbe1= 5000000  Pscbe2= 5E-09 Pdiblcb = -.234
+Pvag= 0 delta=0.01
+ Wl =  0 Ww = -1.420242E-09 Wwl =  0 
+ Wln =  0 Wwn =  .2613948 Ll =  1.300902E-10 
+ Lw =  0 Lwl =  0 Lln =  .316394 
+ Lwn =  0
+kt1=-.3  kt2=-.051 
+At= 22400 
+Ute=-1.48 
+Ua1= 3.31E-10  Ub1= 2.61E-19 Uc1= -3.42e-10 
+Kt1l=0 Prt=764.3

.model pch PMOS
+Level=        49 
+Tnom=27.0
+RDC=30 RSC=30
+Nch= 3.533024E+17  Tox=9E-09 Xj=1.00000E-07
+Lint=6.23e-8 Wint=1.22e-7
+Vth0=-.6732829 K1= .8362093  K2=-8.606622E-02  K3= 1.82 
+Dvt0= 1.903801  Dvt1= .5333922  Dvt2=-.1862677 
+Nlx= 1.28e-8  W0= 2.1e-6 
+K3b= -0.24 Prwg=-0.001 Prwb=-0.323 
+Vsat= 103503.2  Ua= 1.39995E-09  Ub= 1.e-19  Uc=-2.73e-11 
+ Rdsw= 460  U0= 138.7609 
+A0= .4716551 Ags=0.12 
+Keta=-1.871516E-03  A1= .3417965  A2= 0.83 
+Voff=-.074182  NFactor= 1.54389  Cit=-1.015667E-03 
+Cdsc= 8.937517E-04 
+Cdscb= 1.45e-4  Cdscd=1.04e-4
+ Dvt0w=0.232 Dvt1w=4.5e6 Dvt2w=-0.0023
+Eta0= 6.024776E-02  Etab=-4.64593E-03 
+Dsub= .23222404 
+Pclm= .989  Pdiblc1= 2.07418E-02  Pdiblc2= 1.33813E-3 
+Drout= .3222404  Pscbe1= 118000  Pscbe2= 1E-09 
+Pvag= 0 
+kt1= -0.25  kt2= -0.032 prt=64.5 
+At= 33000 
+Ute= -1.5 
+Ua1= 4.312e-9 Ub1= 6.65e-19  Uc1= 0 
+Kt1l=0

V1 net5 0 dc 3.3
v2 net2 0 dc 1.5   ac 1
.ac dec 10 10 1G

.noise v(net4) v2 dec 10 10 1G

.measure  ac dc_gain_0  POINT   v(net3)   ARG0=1e6
.measure  ac dc_gain_1  POINT   v(net3)   ARG0=1e8
.measure  ac  crossnet3   cross v(net3)   val=0.6 
.measure noise   nft    cross   onoise_s  val=1.3e-16
.let   ac sumnet34='v(net3)+v(net4)'
.measure  ac   sumnet34    POINT   v(net3)   ARG0=1e6

.param    point1=0.2  point2=0.8
.measure  ac slope1   cross  v(net3)   val='point1'
.measure  ac  slope2  cross   v(net3)   val='point2'
.measure  ac  slopenet3   expr  val='abs((point2-point1)/(slope1-slope2))' 
.measure  ac  IM3   POINT     i1(m3)   ARG0=1e7

.end