I am simulating the Common source amplifier circuit with current mirror. I wanted to see the frequency reponse of this circuit. And I got the constant value as you see the upper graph.



I have finally noitced if I change the value the parastic properties at Input Voltage Source, It shows the curve similar as I expected.

I want to ask you I'm on a right way to do AC simulation, And How should I set the parasitic properties. Thank you.

 

You took a huge capacity of the signal source - that's not right. Standard field-effect transistors have no parasitic capacitance, which gave you a horizontal gain line. You need to take the real models. And the fact that you used resistance and signal source capacitance to simulate the decay is cheating.

 

You took a huge capacity of the signal source - that's not right. Standard field-effect transistors have no parasitic capacitance, which gave you a horizontal gain line. You need to take the real models. And the fact that you used resistance and signal source capacitance to simulate the decay is cheating.

I selected monolithic MOSFET NMOS4, PMOS4, and I downloaded MOSFET models at this websites (http://cmosedu.com/cmos1/book.htm)and included that Models.

And we can see the frequency response like a upper photo.

But, when I have added .model on text and typed DC parameters, It didn't seem to be applied.

I doubted It is because MOSFET model I have downloaded already have that parameters.

And I read that file and didn't find those parameters(kp,kn,Vto,lamba....)

How can I apply it?

I add the model parameters.

• Short channel models from CMOS Circuit Design, Layout, and Simulation,
• 50nm BSIM4 models VDD=1V, see CMOSedu.com

.model N_50n nmos level = 54

+binunit = 1 paramchk= 1 mobmod = 0

+capmod = 2 igcmod = 1 igbmod = 1 geomod = 0

+diomod = 1 rdsmod = 0 rbodymod= 1 rgatemod= 1

+permod = 1 acnqsmod= 0 trnqsmod= 0

+tnom = 27 toxe = 1.4e-009 toxp = 7e-010 toxm = 1.4e-009

+epsrox = 3.9 wint = 5e-009 lint = 1.2e-008

+ll = 0 wl = 0 lln = 1 wln = 1

+lw = 0 ww = 0 lwn = 1 wwn = 1

+lwl = 0 wwl = 0 xpart = 0 toxref = 1.4e-009

+vth0 = 0.22 k1 = 0.35 k2 = 0.05 k3 = 0

+k3b = 0 w0 = 2.5e-006 dvt0 = 2.8 dvt1 = 0.52

+dvt2 = -0.032 dvt0w = 0 dvt1w = 0 dvt2w = 0

+dsub = 2 minv = 0.05 voffl = 0 dvtp0 = 1e-007

+dvtp1 = 0.05 lpe0 = 5.75e-008 lpeb = 2.3e-010 xj = 2e-008

+ngate = 5e+020 ndep = 2.8e+018 nsd = 1e+020 phin = 0

+cdsc = 0.0002 cdscb = 0 cdscd = 0 cit = 0

+voff = -0.15 nfactor = 1.2 eta0 = 0.15 etab = 0

+vfb = -0.55 u0 = 0.032 ua = 1.6e-010 ub = 1.1e-017

+uc = -3e-011 vsat = 1.1e+005 a0 = 2 ags = 1e-020

+a1 = 0 a2 = 1 b0 = -1e-020 b1 = 0

+keta = 0.04 dwg = 0 dwb = 0 pclm = 0.18

+pdiblc1 = 0.028 pdiblc2 = 0.022 pdiblcb = -0.005 drout = 0.45

+pvag = 1e-020 delta = 0.01 pscbe1 = 8.14e+008 pscbe2 = 1e-007

+fprout = 0.2 pdits = 0.2 pditsd = 0.23 pditsl = 2.3e+006

+rsh = 3 rdsw = 150 rsw = 150 rdw = 150

+rdswmin = 0 rdwmin = 0 rswmin = 0 prwg = 0

+prwb = 6.8e-011 wr = 1 alpha0 = 0.074 alpha1 = 0.005

+beta0 = 30 agidl = 0.0002 bgidl = 2.1e+009 cgidl = 0.0002

+egidl = 0.8

+aigbacc = 0.012 bigbacc = 0.0028 cigbacc = 0.002

+nigbacc = 1 aigbinv = 0.014 bigbinv = 0.004 cigbinv = 0.004

+eigbinv = 1.1 nigbinv = 3 aigc = 0.017 bigc = 0.0028

+cigc = 0.002 aigsd = 0.017 bigsd = 0.0028 cigsd = 0.002

+nigc = 1 poxedge = 1 pigcd = 1 ntox = 1

+xrcrg1 = 12 xrcrg2 = 5

+cgso = 6.238e-010 cgdo = 6.238e-010 cgbo = 2.56e-011 cgdl = 2.495e-10

+cgsl = 2.495e-10 ckappas = 0.02 ckappad = 0.02 acde = 1

+moin = 15 noff = 0.9 voffcv = 0.02

+kt1 = -0.21 kt1l = 0.0 kt2 = -0.042 ute = -1.5

+ua1 = 1e-009 ub1 = -3.5e-019 uc1 = 0 prt = 0

+at = 53000

+fnoimod = 1 tnoimod = 0

+jss = 0.0001 jsws = 1e-011 jswgs = 1e-010 njs = 1

+ijthsfwd= 0.01 ijthsrev= 0.001 bvs = 10 xjbvs = 1

+jsd = 0.0001 jswd = 1e-011 jswgd = 1e-010 njd = 1

+ijthdfwd= 0.01 ijthdrev= 0.001 bvd = 10 xjbvd = 1

+pbs = 1 cjs = 0.0005 mjs = 0.5 pbsws = 1

+cjsws = 5e-010 mjsws = 0.33 pbswgs = 1 cjswgs = 5e-010

+mjswgs = 0.33 pbd = 1 cjd = 0.0005 mjd = 0.5

+pbswd = 1 cjswd = 5e-010 mjswd = 0.33 pbswgd = 1

+cjswgd = 5e-010 mjswgd = 0.33 tpb = 0.005 tcj = 0.001

+tpbsw = 0.005 tcjsw = 0.001 tpbswg = 0.005 tcjswg = 0.001

+xtis = 3 xtid = 3

+dmcg = 0e-006 dmci = 0e-006 dmdg = 0e-006 dmcgt = 0e-007

+dwj = 0e-008 xgw = 0e-007 xgl = 0e-008

+rshg = 0.4 gbmin = 1e-010 rbpb = 5 rbpd = 15

+rbps = 15 rbdb = 15 rbsb = 15 ngcon = 1