An ideal bias t is a combination of a DC block and a DC feed (fig. 9.1). During DC simulation the MNA matrix of an ideal bias t writes as follows:

(9.21) |

The MNA entries of the bias t during AC analysis write as follows.

(9.22) |

The scattering parameters writes as follows.

(9.23) |

A bias t is noise free. A model for transient simulation does not exist. It is common practice to model it as an inductor and a capacitance with finite values which are entered by the user.

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