91 lines
1.8 KiB
Plaintext
91 lines
1.8 KiB
Plaintext
* 51 stage Ring-Osc. BSIM3, transient noise
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* will need 90 sec on a i7 860 with 4 threads
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* for better noise analysis simulation time may be made larger than 200n
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* closes the loop between inverters xinv1 and xinv5
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vin in out dc 0.5 pulse 0.5 0 0.1n 5n 1 1 1
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vdd dd 0 dc 0 pulse 0 2.2 0 1n 1 1 1
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vss ss 0 dc 0
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ve sub 0 dc 0
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vpe well 0 2.2
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* noisy inverters
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xiinv2 dd ss sub well out25 out50 inv253
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xiinv1 dd ss sub well in out25 inv253
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*three very noisy inverters
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xiinv51 dd ss sub well out50 out51 inv1_2
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xiinv52 dd ss sub well out51 out52 inv1_2
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xiinv53 dd ss sub well out52 out inv1_2
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*output amplifier
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xiinv11 dd ss sub well out25 bufout inv2
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cout bufout ss 0.2pF
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.option itl1=500 gmin=1e-15 itl4=10 noacct
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* .dc vdd 0 2 0.01
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.tran 8p 200n
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.save in bufout v(t1)
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.include modelcard.nmos
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.include modelcard.pmos
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.include noilib-demo.h
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.control
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unset ngdebug
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* first run
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save bufout $ needed for restricting memory usage
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rusage
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run
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rusage
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plot bufout xlimit 90n 95n
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linearize
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fft bufout
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echo start noise in plot $curplot
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echo
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* next run
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* reset
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save bufout
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* original noise parameters 0.05 8p 1.0 0.001
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alter @v.xiinv51.vn1[trnoise] = [ 0 0 0 0 ] $ no noise
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alter @v.xiinv52.vn1[trnoise] = [ 0 0 0 0 ] $ no noise
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alter @v.xiinv53.vn1[trnoise] = [ 0 0 0 0 ] $ no noise
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run
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rusage
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plot bufout xlimit 90n 95n
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linearize
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fft bufout
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echo no noise in plot $curplot
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echo
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* next run
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* reset
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save bufout
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alter @v.xiinv51.vn1[trnoise] = [ 0.1 8p 1.5 0.002 ] $ more noise
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alter @v.xiinv52.vn1[trnoise] = [ 0.1 8p 1.5 0.002 ] $ more noise
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alter @v.xiinv53.vn1[trnoise] = [ 0.1 8p 1.5 0.002 ] $ more noise
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run
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rusage
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plot bufout xlimit 90n 95n
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linearize
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fft bufout
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echo more noise in plot $curplot
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echo
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set color0=white
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set color1=black
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plot mag(sp6.bufout) mag(sp2.bufout) mag(sp4.bufout) xlimit 0 2G ylimit 1e-7 1 ylog
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.endc
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.end
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