Jean-Marie Pham

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)

Design of a bulk acoustic wave coupled-resonator filter application in the WLAN band (5.15 - 5.35 GHz)

This paper presents the design of a bulk acoustic wave coupled-resonator filter (BAW-CRF) for application in the WLAN 802.11a European band (5.15 GHz 5.35 GHz). The presented design methodology allows retrieving the filter structure dimensions (layer thicknesses and electrode areas) based on the extraction of an equivalent network from Chebyshev expressions. The BAW CRF can be fabricated on top of silicon substrates. The designed filter consists in a very compact solution (180 /spl mu/m /spl times/ 115 /spl mu/m), having 2 dB of insertion loss and 48 dB of attenuation at the rejection band.

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

Analysis of Temperature Modulation on a SiGe Power Amplifier Non Linearity

The following discussion presents the design and measurements of a power amplifier for a WCDMA handset application on silicon with a STM BiCMOS 0.25mum process. An analysis of the impact of temperature on linearity especially on adjacent channel power regrowth is proposed

Suspended substrate stripline cross-coupled trisection filters with asymmetrical frequency characteristics

Novel compact suspended substrate stripline filters in the Ku band are proposed. Two bandpass trisection filters with asymmetrical characteristics are presented. The use of meandered-line open-loop resonators allows a significant size reduction and either positive or negative cross coupling can be realized. The synthesis is based on the general folded cross-coupled network with parallel resonators and admittance inverters. The suspended substrate technology provides an excellent electrical performance and yields a high quality factor, thus making these filters very attractive for satellite communications systems.

A two zero fourth order microwave waveguide filter using a simple rectangular quadruple-mode cavity

In order to reduce the size of microwave waveguide filters, triple and quadruple mode filters in circular waveguide have been investigated intensively. However, the research for such filters in rectangular waveguide is still poor and the rare trials have led to complicated sensible structures with loaded cavities. This paper describes a fourth order filter with two transmission zeroes obtained with only one basic rectangular cavity and two irises. Neither coupling nor tuning screws are needed. The analysis at the discontinuities is performed by the moment method. The synthesis lies on an optimization method based on the genetic algorithm.

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 a multi-cell power amplifier for WCDMA application

This paper presents several techniques in order to improve the trade-off linearity/efficiency in power amplifiers for WCDMA application. First of all, the study of a differential bipolar linearizer is addressed; second, the consumption control via switched biases and power cells. Simulations were carried out with a BiCMOS process and they show a 27 dBm linear power amplifier (PA) output power with a power added efficiency up to 35% and a 31 dBm maximum output power with a 45% power added efficiency (PAE).

A new class of dual-mode asymmetric microwave rectangular filters

Satellite communications are used extensively today. The separation of the different frequency channels requires greater selectivity. Designers have unanimously adopted the circular filters to do this task. But the circular waveguides require a very long, hard development process. We present, in this paper, a new method of filtering based on rectangular geometry. We give a new synthesis procedure and we show that this original configuration can create zeros at right or left hand of the band. With a very powerful computational circuit and electromagnetic analysis, the design needs less tuning. To validate this new concept of filtering, we present the measurements of two TE/sub 10//TE/sub 30/ rectangular dual-mode filters.