Alexandre Shirakawa

Bulk acoustic wave coupled resonator filters synthesis methodology

This paper presents a synthesis methodology applied to bulk acoustic wave coupled resonator filters (BAW CRF). BAW-CRFs are able to realize wider bandwidth and higher rejection filter responses, but they present smoother roll-off coefficients compared to classical ladder topology. The proposed methodology enables to determine the filter structure dimensions able to synthesize Chebyshev responses. Finally, we address the design of an RF filter applied to the W-CDMA system employing the proposed methodology.

A High Isolation and High Selectivity Ladder-Lattice BAW-SMR Filter

This paper presents a BAW-SMR filter using a combined ladder-lattice topology for application in W-CDMA reception front-ends (2.11 - 2.17 GHz). The combined topology allies the advantages of both network types, having very steep responses and high isolation at undesired bands. The design of filter was simulated using a combined 2D EM-acoustical analysis procedure, it presents: 1.6 dB of insertion loss, -10 dB of return loss and isolation higher than -48 dB at TX band (1.92 - 1.98 GHz)

A study on FBAR Filters reconfiguration

This paper presents the possibilities to reconfigure the Film Bulk Acoustic Resonator (FBAR) Filters. We propose the addition of passive elements (L, C) to the FBAR. An augmentation of 35% to the bandwidth is found when adding inductances, and a reduction of 32% is established when using capacitances. Also, we propose a new reconfiguration technique for FBARs filters using RF-MEMS switches. We detail this new reconfiguration technique, showing an example of a reconfigurable FBAR filter for operation in the W-LAN 802.11b/g (2.4-2.48 GHz) and in the W-CDMA (2.11-2.17 GHz) communication standards.

A Multistandard RF Receiver Front-End Using a Reconfigurable FBAR Filter

This article presents a dual-standard RF receiver front-end (RFFE). It consists of a reconfigurable FBAR filter using MEMS switches, a dual-standard low-noise amplifier (LNA), an active single-to-differential converter (SDC) and I/Q down conversion mixers. The proposed RFFE is targeted to W-LAN 802.11b/g (2.4-2.48 GHz) and W-CDMA-FDD (2.11-2.17 GHz) wireless standards. The active blocks use the 0.25-mum SiGe:C BiCMOS process from STMicroelectronics. The feasibility of BiCMOS compatible integrated tunable FBAR filter in BAW technology enables a very compact solution through module integration

Design of a fully-integrated BiCMOS/FBAR reconfigurable RF receiver front-end

This article presents guidelines to design a dual-standard fully-integrated RF receiver front-end (RFFE). The designed front-end consists of two system selection integrated FBAR filters, a dual-standard low-noise amplifier (LNA), an active single-to-differential converter (SDC) and I/Q downconversion mixers. The active blocks use the 0.25-mum 60-GHz fT SiGe:C BiCMOS7RF process from STMicroelectronics. The proposed RFFE is targeted to DCS1800 (1805-1880MHz) and W-CDMA-FDD (2110-2170MHz) wireless standards. The availability of integrated FBAR filters in BAW technology, compatible with the used BiCMOS process, enables a very compact solution through a module integration

Reconfiguration of Bulk Acoustic Wave Filters: Application to WLAN 802.11b/g (2.40-2.48 GHz)

This paper presents a BAW-SMR (bulk acoustic wave-solidly mounted resonator) filter in a ladder topology used for the 802.11b/g standard (2.40-2.48 GHz). Also, it shows the effects of the addition of passive elements (L,C) to reconfigure this type of filters. A reduction of 32% to the bandwidth is obtained when adding capacitances and an augmentation of 30% is obtained when adding inductances.

An Improved Isolation W-CDMA Ladder BAW-SMR Filter

This paper presents a ladder BAW-SMR filter with improved isolation for application in W-CDMA reception band (2.11- 2.17 GHz). The high isolation is achieved by placing one transmission zero at the W-CDMA transmission band (1.92 -1.98 GHz). It could be implemented thanks to a design technique that employs bonding wires to introduce transmission zeros. This technique enables to increase the rejection of ladder BAW filters. The filter presents: 1.6 dB of insertion loss, -16 dB of return loss and isolation higher than 35 dB at TX band (1.92 -1.98 GHz).

Design of FBAR filters at high frequency bands: Research Articles

This paper presents recent advances in the areas of modeling, design, and fabrication of microwave filters for space applications. A fast and accurate hybrid analysis method, combining boundary integral resonant mode expansion (BI-RME) and integral equation (IE) techniques, is described. Several filters used in satellite payloads have been successfully designed, manufactured, and measured.

Dual-mode RF receiver front-end using a 0.25-/spl mu/m 60-GHz f/sub T/ SiGe:C BiCMOS7RF technology

This paper presents a dual-mode RF receiver front-end consisting of a LNA, an active single-ended-to-differential converter and a downconversion mixer. It uses a high performance 0.25-/spl mu/m 60-GHz f/sub T/ SiGe:C BiCMOS7RF integration technology from STMicroelectronics. The proposed RF receiver front-end (RFFE) is targeted to GSM1800 (1805-1880MHz) and WCDMA-FDD (2110-2170MHz) systems. The main motivation of this work is to share as many elements as possible in both modes avoiding conventional parallel receiver chains, which is not a cost-efficient solution. The overall RFFE achievable gain is around 40dB in both modes. The overall front-end noise figure (Friis formula) is less than 1.3dB for GSM1800 and 1.6dB for WCDMA mode. These performances fulfil the systems requirements. The complete RFFE circuit consumes 18 mW in both operation modes at 2.5 V supply voltage.

Dual-mode RF receiver front-end using a 0.25-µm 60-GHz f T SiGe:C BiCMOS7RF technology

This paper presents a dual-mode RF receiver front-end consisting of a LNA, an active single-ended-to-differential converter and a downconversion mixer. It uses a high performance 0.25-/spl mu/m 60-GHz f/sub T/ SiGe:C BiCMOS7RF integration technology from STMicroelectronics. The proposed RF receiver front-end (RFFE) is targeted to GSM1800 (1805-1880MHz) and WCDMA-FDD (2110-2170MHz) systems. The main motivation of this work is to share as many elements as possible in both modes avoiding conventional parallel receiver chains, which is not a cost-efficient solution. The overall RFFE achievable gain is around 40dB in both modes. The overall front-end noise figure (Friis formula) is less than 1.3dB for GSM1800 and 1.6dB for WCDMA mode. These performances fulfil the systems requirements. The complete RFFE circuit consumes 18 mW in both operation modes at 2.5 V supply voltage.