can anybody tell me why nanosim simulation gives out ZERO cu

W

walala

Guest
one VHDL program, used synopsys dc to synthesize and then used se
place&route and extract the netlist, now use nanosim to simulate:

A large number of warnings generated:

WARNING:NanoSim:0x2110f525:Negative bulk-drain bias: element M3643,
vbs=-0.400418... at 31.86ns ...

what is the problem?

why the simulated current is ZERO and when I use awaves to see the
waveforms, all output waveforms are zero?

------------------------------------------------------------
Final result:

Block: total
Number of nodes in block : 199
Number of elements in block : 526
Number of block supply nodes : 0
Number of block ground nodes : 0
Number of block biput nodes : 16
Number of block input nodes : 0
Number of block output nodes : 0
Number of block stages : 1
Number of block partial stages : 0

Average supply current : 0.000000 uA
RMS supply current : 0.000000 uA

Average input current : 0.000000 uA
RMS input current : 0.000000 uA

Average output current : 0.000000 uA
RMS output current : 0.000000 uA

Average biput current : 23.848912 uA
RMS biput current : 164.434740 uA

Average block power : 11.637640 uW
RMS block power : 360.975686 uW

Simulation time resolution : 1.000e-02 ns
Number of PWL matrix solutions : 1399
Number of PWL MOS model lookups : 228412
Number of time steps : 398
Number of iterations : 0
Number of rejected time steps : 0

Global simulation parameters used:

SPD 0.25V ASPD 0.1V
SIM_DESV 0.25V SIM_AESV 0.125V
VDS_MIN 0.000369011V AVDS_MIN 1e-08V
SSC (steady state current) 0.1uA
SUBI (subthreshold current) 1uA
DC CURRENT 1uA

14.0 real 2.0 user 0.0 sys


No errors reported in the .err file (output.err)
 
walala wrote:
one VHDL program, used synopsys dc to synthesize and then used se
place&route and extract the netlist, now use nanosim to simulate:

A large number of warnings generated:

WARNING:NanoSim:0x2110f525:Negative bulk-drain bias: element M3643,
vbs=-0.400418... at 31.86ns ...

what is the problem?
Click to expand...
you can ignore this warning.

why the simulated current is ZERO and when I use awaves to see the
waveforms, all output waveforms are zero?
Click to expand...
what current are you expecting? You have to set the right precision
for printing the current.

------------------------------------------------------------
Final result:

Block: total
Number of nodes in block : 199
Number of elements in block : 526
Number of block supply nodes : 0
Number of block ground nodes : 0
Number of block biput nodes : 16
Number of block input nodes : 0
Number of block output nodes : 0
Number of block stages : 1
Number of block partial stages : 0

Average supply current : 0.000000 uA
RMS supply current : 0.000000 uA

Average input current : 0.000000 uA
RMS input current : 0.000000 uA

Average output current : 0.000000 uA
RMS output current : 0.000000 uA

Average biput current : 23.848912 uA
RMS biput current : 164.434740 uA

Average block power : 11.637640 uW
RMS block power : 360.975686 uW

Simulation time resolution : 1.000e-02 ns
Number of PWL matrix solutions : 1399
Number of PWL MOS model lookups : 228412
Number of time steps : 398
Number of iterations : 0
Number of rejected time steps : 0

Global simulation parameters used:

SPD 0.25V ASPD 0.1V
SIM_DESV 0.25V SIM_AESV 0.125V
VDS_MIN 0.000369011V AVDS_MIN 1e-08V
SSC (steady state current) 0.1uA
SUBI (subthreshold current) 1uA
DC CURRENT 1uA

14.0 real 2.0 user 0.0 sys


No errors reported in the .err file (output.err)
Click to expand...
 
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