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148 2. Tutorial
6
VDD
M3
M4
5
1
M1
4
M2
2
V1
3
V2
CL
IBIAS
Figure 9.4: Single-ended CMOS differential stage
Following, the netlist description of the circuit is not written by hand, but imported via the Analog
Insydes command ReadNetlist (Section 3.10.1) from already existing simulator files. This function
supports the standard application of symbolic analysis which is the extension of a simulation
performed with a numerical circuit simulator. By this, a time-consuming and error-prone data
conversion by hand is ruled out. In our case we start from a PSpice simulation. Thus, we need
to specify the PSpice netlist and output file in the ReadNetlist call, as well as the option setting
Simulator −> "PSpice" for applying the simulator-specific interface functionality.
In[5]:= cmosdiffamp = ReadNetlist[
"AnalogInsydes/DemoFiles/CMOSdiffamp.cir",
"AnalogInsydes/DemoFiles/CMOSdiffamp.out",
KeepPrefix −> False, Simulator −> "PSpice"]
Out[5]= Circuit
In[6]:= Statistics[cmosdiffamp]
Number of Capacitors : 1
Number of CurrentSources : 1
Number of VoltageSources : 3
Number of models MOSFET/MODN : 2
Number of models MOSFET/MODP : 2
Total number of elements : 9
The automatically generated netlist description of the amplifier contains generic model references of
the form