Dong-Ha Shim

Ultra-miniature monolithic FBAR filters for wireless applications

This paper presents ultra-miniature monolithic transmit (Tx) filters for 1900 MHz PCS using thin film bulk acoustic resonators (FBAR) technology. Conventional FBAR filters often include multiple tuning inductors, which have prevented the miniaturization and the monolithic integration of the filters. However, the developed filter has a novel circuit configuration using a single integrated inductor to minimize the size. The FBAR block consists of seven FBARs electrically coupled in a ladder topology. A meander type inductor is used for simplicity of fabrication processes and is optimized to increase the receive (Rx) band rejection performance. The filters are hermetically packaged at a wafer-level, which enables us to achieve a size of 1.0 mm /spl times/ 1.0 mm /spl times/ 0.7 mm. The packaged filters showed high performance with insertion loss less than 3.3 dB and Rx band rejection over 35 dB.

Refined wide band modelling and design of CMOS-compatible spiral inductors with BCB dielectric layer

This paper discloses a new measurement-based model of on-chip spiral inductor with BCB dielectric layer. The parameters of refined equivalent circuit are extracted through an optimisation with respect to specially formulated objective function. Accurate modelling of fabricated high-Q inductors validates the proposed approach over a wide band from 100 MHz to 20 GHz.