Hybrid small‐signal model parameter extraction of GaN HEMTs on Si and SiC substrates based on global optimization
Anwar H. Jarndal Ahmed S. HusseinFirst published: 04 October 2018 https://doi.org/10.1002/mmce.21555
After defing your device structure and model inclusion and all use the following code for ft and fmax for different bias conditions:
In tony plot you have to select x axis frequency in log scale curretn gain and power gain in y axis normal scale.
# Initial solution
solve init
save outf=mmfreqq_1.str
# Apply a set of biases at the gate and drain
solve vgate = -1
solve vdrain = 0.1
solve vdrain=0.25 vfinal=20.0 vstep=0.25 name=drain
# Frequency domain AC simulation.
log outf=mmfreqq_ac_1.log master gains s.params inport=gate outport=drain width=50
solve ac freq=10 fstep=10 mult.f nfstep=7
solve ac freq=1e9
solve ac freq=2e9 fstep=2e9 nfstep=3
solve ac freq=1e10 fstep=5e9 nfstep=8
log off
solve init
solve vgate = 0
solve vdrain = 0.1
solve vdrain=0.25 vfinal=20.0 vstep=0.25 name=drain
# Frequency domain AC simulation.
log outf=mmfreqq_ac_2.log master gains s.params inport=gate outport=drain width=50
solve ac freq=10 fstep=10 mult.f nfstep=7
solve ac freq=1e9
solve ac freq=2e9 fstep=2e9 nfstep=3
solve ac freq=1e10 fstep=5e9 nfstep=8
log off
solve init
solve vgate = 1
solve vdrain = 0.1
solve vdrain=0.25 vfinal=20.0 vstep=0.25 name=drain
# Frequency domain AC simulation.
log outf=mmfreqq_ac_3.log master gains s.params inport=gate outport=drain width=50
solve ac freq=10 fstep=10 mult.f nfstep=7
solve ac freq=1e9
solve ac freq=2e9 fstep=2e9 nfstep=3
solve ac freq=1e10 fstep=5e9 nfstep=8
log off
#max cutoff frequency
#extract name="ft_max" max(g."drain""gate"/(6.28*c."gate""gate"))
# Displaying the results
tonyplot mmfreqq_1.str -set mmfreqq_1.set
tonyplot -overlay mmfreqq_ac_1.log mmfreqq_ac_2.log mmfreqq_ac_3.log -set mmfreqq_2.set
#tonyplot -overlay mmfreqq_ac_1.log mmfreqq_ac_2.log mmfreqq_ac_3.log mmfreqq_ac_4.log mmfreqq_ac_5.log mmfreqq_ac_6.log-set mmfreqq_3.set
quit
Thank you sir, P. Murugapandiyan ....wishing u goodness n ease ...cant thank u enough...
- Badges
- Science topic
- Similar topics
- Engineering
- Control Theory