Hybrid inductor modeling for successful filter design

Abstract

Study of a Fabry-Perot cavity in the microwave frequency range by the boundary element method," Absfruct-A method for deriving accurate L-band inductor models using 1-port 6xtured S-parameter measurements is presented, along with examples of successful filter designs using the models. Models were developed for a number of surface-mount and leaded devices with values ranging from 4.7 nH to 470 nH. The devices were measured in a coaxial test fixture on an HP8510B network analyzer, with fixture de-embeddmg performed using CAD software. The models are seen to fit measured data over a broadband, from low F W through resonance. To M e r validate the models, several filter circuits were developed and fabricated.The results of 5th-and 9th-order lowpass filter designs are presented here. The 9th-order Mter was optimized for the desired performance using the parasitic inductor models. Measurements confirm that the use of the models led to a successful design on the %rst pass." Finally, simulations show that this success would not have been achieved without the developed inductor models.

Efficient inductor layout geometries for radio frequency integrated circuits

“…The third model, shown in Figure 4c, (Gaiewski, Dunleavy, & Geis, 1994) is used here because it has the same number of elements as the first model but in a different configuration and so should have about the same accuracy as the first model (Gaiewski, Dunleavy, & Geis, 1994). The last model is much more complicated and so should have a longer solution time but much more accurate fit to the data.…”