159 lines
4.2 KiB
Plaintext
159 lines
4.2 KiB
Plaintext
* Test of VCO: frequency versus control voltage
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* 7 stage Ring-Osc. made of gain cells BSIM3
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* P.-H. Hsieh, J. Maxey, C.-K. K. Yang, IEEE JSSC, Sept. 2009, pp. 2488 - 2495
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* alternatively use d_osc code model
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* measure frequency of R.O. by fft
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.param vcc=3.3
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.csparam simtime=500n
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vdd dd 0 dc 'vcc'
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vco cont 0 dc 2.5
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* vco
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* buf: analog out
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* d_digout: digital out
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* cont: analog control voltage
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* dd: analog supply voltage
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*.include vco_sub.cir
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*xvco buf d_digout cont dd ro_vco
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.include vco_sub_new.cir
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xvco buf d_digout cont dd d_osc_vco
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.option noacct
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.control
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set xtrtol=2
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set dt = $curplot
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set curplot = new
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set curplottitle = "Frequency versus voltage"
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set freq_volt = $curplot $ store its name to 'freq_volt'
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setplot $freq_volt
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let vcovec=vector(5)
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let foscvec=vector(5)
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setplot $dt
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alter vco 0.5
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tran 0.1n $&simtime 0
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let {$freq_volt}.vcovec[0]=v(cont)
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linearize buf
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fft buf
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* start meas at freq > 0 to skip large dc part
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meas sp fosc MAX_AT buf from=1e3 to=1e9
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let {$freq_volt}.foscvec[0]=fosc
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plot d_digout xlimit 140n 160n
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reset
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alter vco 1
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tran 0.1n $&simtime 0
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let {$freq_volt}.vcovec[1]=v(cont)
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linearize buf
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fft buf
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meas sp fosc MAX_AT buf from=1e3 to=1e9
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let {$freq_volt}.foscvec[1]=fosc
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plot d_digout xlimit 140n 160n
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reset
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alter vco 1.5
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tran 0.1n $&simtime 0
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let {$freq_volt}.vcovec[2]=v(cont)
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linearize buf
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fft buf
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meas sp fosc MAX_AT buf from=1e3 to=1e9
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let {$freq_volt}.foscvec[2]=fosc
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plot d_digout xlimit 140n 160n
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reset
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alter vco 2
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tran 0.1n $&simtime 0
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let {$freq_volt}.vcovec[3]=v(cont)
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linearize buf
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fft buf
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meas sp fosc MAX_AT buf from=1e3 to=1e9
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let {$freq_volt}.foscvec[3]=fosc
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plot d_digout xlimit 140n 160n
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reset
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alter vco 2.5
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tran 0.1n $&simtime 0
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let {$freq_volt}.vcovec[4]=v(cont)
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linearize buf
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fft buf
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meas sp fosc MAX_AT buf from=1e3 to=1e9
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let {$freq_volt}.foscvec[4]=fosc
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plot d_digout xlimit 140n 160n
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plot tran1.buf tran3.buf tran5.buf tran7.buf tran9.buf xlimit 140n 160n
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plot mag(sp2.buf) mag(sp4.buf) mag(sp6.buf) mag(sp8.buf) mag(sp10.buf) xlimit 100e6 1100e6
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setplot $freq_volt
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settype frequency foscvec
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settype voltage vcovec
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plot foscvec vs vcovec
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print vcovec foscvec
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rusage
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.endc
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*model = bsim3v3
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*Berkeley Spice Compatibility
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* Lmin= .35 Lmax= 20 Wmin= .6 Wmax= 20
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.model N1 NMOS
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*+version = 3.2.4
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+version = 3.3.0
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+Level= 8
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+Tnom=27.0
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+Nch= 2.498E+17 Tox=9E-09 Xj=1.00000E-07
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+Lint=9.36e-8 Wint=1.47e-7
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+Vth0= .6322 K1= .756 K2= -3.83e-2 K3= -2.612
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+Dvt0= 2.812 Dvt1= 0.462 Dvt2=-9.17e-2
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+Nlx= 3.52291E-08 W0= 1.163e-6
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+K3b= 2.233
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+Vsat= 86301.58 Ua= 6.47e-9 Ub= 4.23e-18 Uc=-4.706281E-11
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+Rdsw= 650 U0= 388.3203 wr=1
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+A0= .3496967 Ags=.1 B0=0.546 B1= 1
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+ Dwg = -6.0E-09 Dwb = -3.56E-09 Prwb = -.213
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+Keta=-3.605872E-02 A1= 2.778747E-02 A2= .9
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+Voff=-6.735529E-02 NFactor= 1.139926 Cit= 1.622527E-04
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+Cdsc=-2.147181E-05
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+Cdscb= 0 Dvt0w = 0 Dvt1w = 0 Dvt2w = 0
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+ Cdscd = 0 Prwg = 0
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+Eta0= 1.0281729E-02 Etab=-5.042203E-03
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+Dsub= .31871233
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+Pclm= 1.114846 Pdiblc1= 2.45357E-03 Pdiblc2= 6.406289E-03
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+Drout= .31871233 Pscbe1= 5000000 Pscbe2= 5E-09 Pdiblcb = -.234
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+Pvag= 0 delta=0.01
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+ Wl = 0 Ww = -1.420242E-09 Wwl = 0
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+ Wln = 0 Wwn = .2613948 Ll = 1.300902E-10
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+ Lw = 0 Lwl = 0 Lln = .316394
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+ Lwn = 0
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+kt1=-.3 kt2=-.051
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+At= 22400
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+Ute=-1.48
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+Ua1= 3.31E-10 Ub1= 2.61E-19 Uc1= -3.42e-10
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+Kt1l=0 Prt=764.3
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.model P1 PMOS
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*+version = 3.2.4
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+version = 3.3.0
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+Level= 8
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+Tnom=27.0
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+Nch= 3.533024E+17 Tox=9E-09 Xj=1.00000E-07
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+Lint=6.23e-8 Wint=1.22e-7
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+Vth0=-.6732829 K1= .8362093 K2=-8.606622E-02 K3= 1.82
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+Dvt0= 1.903801 Dvt1= .5333922 Dvt2=-.1862677
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+Nlx= 1.28e-8 W0= 2.1e-6
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+K3b= -0.24 Prwg=-0.001 Prwb=-0.323
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+Vsat= 103503.2 Ua= 1.39995E-09 Ub= 1.e-19 Uc=-2.73e-11
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+ Rdsw= 460 U0= 138.7609
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+A0= .4716551 Ags=0.12
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+Keta=-1.871516E-03 A1= .3417965 A2= 0.83
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+Voff=-.074182 NFactor= 1.54389 Cit=-1.015667E-03
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+Cdsc= 8.937517E-04
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+Cdscb= 1.45e-4 Cdscd=1.04e-4
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+ Dvt0w=0.232 Dvt1w=4.5e6 Dvt2w=-0.0023
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+Eta0= 6.024776E-02 Etab=-4.64593E-03
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+Dsub= .23222404
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+Pclm= .989 Pdiblc1= 2.07418E-02 Pdiblc2= 1.33813E-3
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+Drout= .3222404 Pscbe1= 118000 Pscbe2= 1E-09
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+Pvag= 0
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+kt1= -0.25 kt2= -0.032 prt=64.5
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+At= 33000
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+Ute= -1.5
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+Ua1= 4.312e-9 Ub1= 6.65e-19 Uc1= 0
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+Kt1l=0
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.end
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