Untapped Topology

Inductor Model Output dialog box

Cadence Virtuoso Interface Inductor Model Options dialog box

The Untapped Topology is one of the two models available for the Inductor Model Extractor. The other is the Center Tapped Topology.

The Untapped model is appropriate under the following conditions:

• The inductor should be a standard 2-port inductor; this model is not appropriate for 3-port center-tapped inductors.

• The analysis frequency band should extend from the frequency where Q exceeds unity to approximately twice the frequency at which the maximum Q-factor is found.

• This model extraction technique has proven most effective with spiral inductors on a conductive substrate, such as those usually found in RFIC processes involving lossy silicon substrates.