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Nexxim Simulator >
Nexxim Linear Network Analysis >
LNA Options

LNA Options

In a netlist, options are specified with the .OPTIONS statement. In Schematic Editor designs, options are specified with the Add Solution Options dialog box.

ZERO_PORT_VALUES

Port impedance resistors specify the port impedances with their PORTNUM parameters (see Resistor, Port Impedance for details). LNA needs to treat these impedances as external to the circuit. The model option ZERO_PORT_VALUES=1 is therefore required for LNA.

The ZERO_PORT_VALUES option is automatically enabled with any design entered through the Schematic Editor in Designer. It does not appear on the list of Analysis Options in the Schematic Editor. For designs entered with the Netlist Editor, the ZERO_PORT_VALUES option must be entered explicitly with a .OPTIONS statement.

Nexxim DC Analysis Options in LNA

All DC Analysis options apply to the operating point analysis that is performed at the start of LNA. See DC Analysis Options in Nexxim Help.

Nexxim S-Parameter Element Options in LNA

For designs that incorporate s-parameter elements, setting the s-parameter option time_domain_s_model=1 causes Nexxim to create a state-space system for the analysis. Normally, a state-space system would not be generated for frequency-domain analyses such as LNA. See S-Element Options.

**Nexxim Linear Network Analysis Options**
Option	Default Value	Description
flag	LNA	LNA=simple AC analysis NOISE_DC=noise analysis LNAN=AC and noise LNAG=AC and group delay LNANG=AC, noise, and group delay
group_delay_pert	None	Perturbation (percentage of the test frequency) to be applied in group delay calculation
input_referred_noise	None	Node voltage, branch, or current to be used as the source for an input-referred noise calculation
result_as_initial_guess	1	Use LNA solution as initial guess in sweep
noise_output	None	Output nodes where noise should be computed in noise analysis. No noise factor or conversion gain is computed for these outputs
skip_dc	no	yes=Field solvers need not solve for DC. Use this option only for circuits with linear devices and no non-zero-valued sources except AC sources. no=Solve for DC.
small_signal_beta	1e-12	Minimum conductance from node to ground in small-signal analysis
ZERO_PORT_VALUES	TRUE	Enable use of port impedance resistors

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