Modeled Elements

Toolbar button: M

A Netlist Project may include one or more Modeled Elements (see Netlist Project Overview). A Modeled Element is an ideal element, such as a resistor, capacitor, inductor, or transmission line, which has a closed-form solution. 

The following is a list of Modeled Elements which may be added to a netlist project. Each one contains a definition and the abbreviation used in the Netlist Project Editor. Unless otherwise noted, the units for each parameter are the project's units, which are set using Circuit > Settings > [Units].

Capacitor

Abbreviation: CAP

Definition: An ideal lumped capacitor

Parameters: There is one parameter available in the Element Parameters section of the dialog box:

  • Capacitance: The capacitance of the capacitor

CC Current Source

Abbreviation: CCCS

Definition: A current controlled current source. A schematic of the element with the nodes numbered is shown below.

CCCS

Parameters: There are three parameters available in the Element Parameters section of the dialog box:

  • Resistance1: Primary resistance, R1
  • Resistance2: Secondary resistance, R2
  • Gain: The ratio of the output current to the input current (see diagram above)

CC Voltage Source

Abbreviation: CCVS

Definition: A current controlled voltage source. A schematic of the element with the nodes numbered is shown below.

CCVS

Parameters: There are three parameters available in the Element Parameters section of the dialog box:

  • Resistance1: Primary resistance, R1
  • Resistance2: Secondary resistance, R2
  • Gain: The ratio of the output voltage to the input current (see diagram above)

Coupled Coils

Abbreviation: MUC

Definition: Mutually coupled coils. A schematic of the element with the nodes numbered is shown below.

MUCParameters: There are four parameters available in the Element Parameters section of the dialog box:

  • Inductance1: Primary inductance, L1
  • Inductance2: Secondary inductance, L2
  • Mutual Inductance: The mutual inductance, M
  • Coupling Parameter: The coupling parameter, K

You may enter either the mutual inductance, M, or the coupling parameter, K. The two values are related by the equation shown above.

Inductor

Abbreviation: IND

Definition: An ideal lumped inductor

Parameters: There is one parameter available in the Element Parameters section of the dialog box:

  • Inductance: The inductance of the inductor

Resistor

Abbreviation: RES

Definition: An ideal lumped resistor

Parameters: There is one parameter available in the Element Parameters section of the dialog box:

  • Resistance: The resistance of the resistor

Transmission Line

Abbreviation: TLIN

Definition: An ideal transmission line specified by its electrical parameters

Parameters: There are three parameters available in the Element Parameters section of the dialog box:

  • Impedance: The characteristic impedance of the transmission line
  • Electrical Length: The electrical length of the transmission line
  • Frequency: The frequency where the electrical length of the transmission line is evaluated

Transmission Line Physical

Abbreviation: TLINP

Definition: An ideal transmission line specified by its physical parameters

Parameters: There are five parameters available in the Element Parameters section of the dialog box:

  • Impedance: The characteristic impedance of the transmission line
  • Length: The physical length of the transmission line
  • K: The effective dielectric constant of the physical transmission line
  • Frequency: The frequency where the attenuation is evaluated
  • Attenuation: The real part of the propagation constant in dB/unit length at the frequency specified above. The transmission line’s attenuation is frequency dependent and is proportional to the square root of frequency. For example, if your project’s length units are microns, specifying an attenuation of 0.002 and a frequency of 4.0 GHz means a 100 micron long line will have an attenuation of 0.2 dB at 4.0 GHz, 0.1 dB at 1.0 GHz, and 0.4 dB at 16.0 GHz. 

VC Current Source

Abbreviation: VCCS

Definition: A voltage controlled current source. A schematic of the element with the nodes numbered is shown below.

VCCS

Parameters: There are three parameters available in the Element Parameters section of the dialog box:

  • Resistance1: Primary resistance, R1
  • Resistance2: Secondary resistance, R2
  • Gain: The ratio of the output current to the input voltage (see diagram above)

VC Voltage Source

Abbreviation: VCVS

Definition: A voltage controlled voltage source. A schematic of the element with the nodes numbered is shown below.

VCVS

Parameters: There are three parameters available in the Element Parameters section of the dialog box:

  • Resistance1: Primary resistance, R1
  • Resistance2: Secondary resistance, R2
  • Gain: The ratio of the output voltage to the input voltage (see diagram above)