A DC feed is an inductor with an infinite inductance. The MNA matrix entries of a DC feed correspond to an ideal short circuit during DC analysis:

(9.19) |

During AC simulation the DC feed is an open circuit. Thus, its MNA entries are all zero.

The scattering parameters writes as follows.

(9.20) |

A DC feed is noise free. A model for transient simulation does not exist. It is common practice to model it as an inductor with finite inductance whose value is entered by the user.

This document was generated by