Download Spectre Circuit Simulator User Guide

Spectre Circuit Simulator User Guide
Control Statements
because the only available estimate of the DC solution would be that computed at T=50C, the
final point in the DC sweep. However, by using a state file to preserve the initial DC solution
at T=0C, you can enable the Spectre simulator to compute the new DC solution quickly. The
computation is fast because the Spectre simulator can use the DC solution computed at
T=0C to estimate the new solution. You can also make future simulations of this circuit start
quickly by using the state file to estimate the DC solution. Even if you have altered a circuit,
it is usually faster to start the DC analysis from a previous solution than to start from the
beginning.
The info Statement
You can generate lists of component parameter values with the info statement. With this
statement, you can access the values of input, output, and operating-point parameters, and
print the node capacitance table. These parameter types are defined as follows:
n
Input parameters
Input parameters are those you specify in the netlist, such as the given length of a
MOSFET or the saturation current of a bipolar resistor.
n
Output parameters
Output parameters are those the simulator computes, such as temperature-dependent
parameters and the effective length of a MOSFET after scaling.
n
Operating-point parameters
Operating-point parameters are those that depend on the operating point.
n
Node Capacitance Table
The node capacitance table displays the capacitance between the nodes of a circuit.
You can also list the minimum and maximum values for the input, output, and operating-point
parameters, along with the names of the components that have those values.
Parameter Setting
Action Taken
what=oppoint
Prints the oppoint parameters. Other possible values are
none, inst, input, output, nodes, all, terminals,
oppoint, models, and captab.
where=logfile
Prints the parameters to the logfile. Other possible values
are nowhere, screen, file, and rawfile.
July 2002
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Product Version 5.0