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## Uniform Distributed RC Model (URC) |

The URC model is derived from a model proposed by L. Gertzberrg in 1974. The model is accomplished by a subcircuit type expansion of the URC line into a network of lumped RC segments with internally generated nodes. The RC segments are in a geometric progression, increasing toward the middle of the URC line, with K as a proportionality constant. The number of lumped segments used, if not specified for the URC line device, is determined by the following formula:

The URC line is made up strictly of resistor and capacitor segments unless the ISPERL parameter is given a non-zero value, in which case the capacitors are replaced with reverse biased diodes with a zero-bias junction capacitance equivalent to the capacitance replaced, and with a saturation current of ISPERL amps per meter of transmission line and an optional series resistance equivalent to RSPERL ohms per meter.

name |
parameter |
units |
default |
example |
area |

K |
Propagation Constant |
- |
2 |
1.2 |
- |

FMAX |
Maximum Frequency of interest |
Hz |
1.0G |
6.5Meg |
- |

RPERL |
Resistance per unit length |
ohm/m |
o1000 |
10 |
- |

CPERL |
Capacitance per unit length |
F/m |
1.0e015 |
1pF |
- |

ISPERL |
Saturation Current per unit length |
A/m |
0 |
- |
- |

RSPERL |
Diode Resistance per unit length |
ohm/m |
0 |
- |
- |