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Nexxim Simulator >
Nexxim Component Models >
Lumped Elements General >
Terminal to Differential or Common Mode Converter

Terminal to Differential or Common Mode Converter

Selecting Differential or Common Mode Conversion

This component is available for Nexxim schematic designs in Designer. Select the component (SnglNd2DorC) from the lumped_general category of Nexxim components. In the Property window, click on the CoSimulator property to display a menu:

DefaultNetlist or DifferentialMode returns the differential mode on the D terminal.

CommonMode returns the common mode on the C terminal.

Netlist Form

The netlist generated by this component depends on the CoSimulator selection.

With DefaultNetlist or DifferentialMode selected, the terminal to differential pair converter has the following three-line Nexxim netlist syntax:

AxxxA n3 0 n1 inet_1 N=2 COMPONENT=transformer1x1
AxxxB n3 0 inet_1 n2 N=2 COMPONENT=transformer1x1
Rxxx inet_1 0 Rterm

With CommonMode selected, the terminal to common mode converter has the following three-line Nexxim netlist syntax:

AxxxA inet_1 0 n3 n2 N=2 COMPONENT=transformer1x1
AxxxB inet_1 0 n1 n3 N=2 COMPONENT=transformer1x1
Rxxx inet_1 0 Rterm

n1 (S1), n2 (S2), and n3 (D or C) are the nodes connected to the mode converter. The entry COMPONENT=transformer1x1 identifies the underlying transformers (see Notes).

**Diff or Common Mode Converter Instance Parameters**
Parameter	Description	Units	Default
CoSimulator	Select Mode: DifferentialMode, CommonMode, or DefaultNetlist (same as DifferentialMode)	None	DefaultNetlist
Rterm	Alternate mode termination impedance	Ohm	25

Netlist Example

A2481A net3 0 net1 inet_1 N=2 COMPONENT=transformer1x1

A2481B net3 0 inet_1 net2 N=2 COMPONENT=transformer1x1

R2481 inet_1 0 25

Notes

1. The mode converter incorporates two ideal transformers and a resistor. The single-ended terminals (S1 and S2) are converted to either a differential or a common mode terminal (D or C).

2. The equivalent circuit to extract the differential mode is shown below. Both transformers have 2:1 coupling ratios.

3. The equivalent circuit to extract the common mode is shown below. Both transformers have 2:1 coupling ratios.

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