LNA Technical Notes
Linear network analysis performs a frequency-domain analysis of the circuit linearized around the DC operating point. You can also run DC noise analysis, group delay analysis, and AC transfer function analysis.
Linear network analysis can be used with all passive circuits, and with active circuits that operate under small-signal conditions. In linear analysis the signal level and termination values do not cancel the small-signal conditions, and the superposition principle holds.
After a successful linear-circuit analysis, the results reflect the electrical characteristics of the circuit under small-signal conditions. The results of the analysis are linear network parameters such as scattering (S), admittance (Y), hybrid (H), and impedance (Z) parameters, port parameters such as RHO and VSWR, and noise parameters such as NF and FMIN.
Nexxim issues a warning message if the circuit contains floating nodes or nodes with single connections. Only nodes with a single branch connection that is both conservative and constitutive are flagged. For example, the controlling nodes in a VCVS have a constitutive/behavioral/relational connection to the controlled nodes, but not a physical/structural/conservative connection, and therefore are not flagged.
The results also include transfer functions of each output current over each input voltage at each of the test frequencies. Transfer functions are typically complex values.