This page can be found on the Simulation Parameters dialog. Use it to set up simulation for Transfer Function analysis.
This analysis is similar to AC analysis in that it performs a swept small signal analysis. However, whereas AC analysis calculates the response at any circuit node from a (usually) single input source, Transfer Function analysis calculates the individual responses from each source in the circuit to a single specified output node. This allows, for example, the series mode gain, common mode gain and power supply rejection of an amplifier to be measured in one analysis. The same measurements could be performed using AC analysis but several of them would need to be run. Transfer function mode also calculates output impedance or admittance and, if an input source is specified, input impedance.
Shortcuts
Default Keys: None
Default Menu: Simulation
Command: Simulation Parameters
How To Setup Transfer Function Analysis Parameters
Select the Simulation Parameters option from the Simulation menu and pick the TF tab.
The following page will be displayed:
Sweep Parameters
Start and Stop Frequency - Defines sweep range stop and start values
Method - The frequency sweep is logarithmic if Decade is selected otherwise it is linear.
Points per decade, Number of points - Defines sweep range. The number of points of the sweep is defined per decade for a decade sweep. For a linear sweep you must enter the total number of points.
Define Mode - Sets up desired sweep mode. Transfer Function repeats a single analysis point while varying some circuit parameter. See Sweep Modes for details.
Transfer Function Parameters
Output Mode - Specify whether the output is a node voltage or device current.
Output Node/Output Source - This is compulsory. If voltage mode is selected it is the name of the circuit node to which the gain of all circuit sources will be calculated. It is the node name as it appears in the netlist. We recommend that when running a transfer function analysis that you assign a user defined name to your designated output node net.
If current mode is selected it is the name of a voltage source through which the output current is measured. The simulation will calculate the gain for every circuit source to this current.
Reference Node - Optional and only available in voltage mode. Output voltage is referred to this node. This is assumed to be ground if it is omitted.
Source Name - Optional. Input impedance to this source device will be calculated if specified.
Monte Carlo and Multi-step Analysis
Transfer Function analysis can be setup to automatically repeat while varying some circuit parameter. See Multi-Step Analyses for details.
Related Topics
AC Sweep Analysis | DC Sweep Analysis | Multi-Step Analyses | Noise Analysis | Transient Analysis | Simulation Parameters | Sweep Modes