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Agilent FBAR duplexers, filters offer low insertion loss

Posted: 15 Mar 2004 ?? ?Print Version ?Bookmark and Share

Keywords:agilent technologies? cdma duplexer/power amplifier front-end module? fbar duplexer? afem-7731?

The combined CDMA duplexer/power amplifier (PA) front-end module (FEM) from Agilent Technologies Inc. is claimed by the company as the industry's first device to be used in dual-band and U.S. PCS (Personal Communications Service) mobile phones and wireless data cards.

"Our FBAR duplexers and filters offer the industry's smallest size and excellent performance with steep roll-off, low insertion loss and low temperature coefficient," said Bryan Ingram, VP and GM of Agilent's Wireless Semiconductor Division. "The combination of these two innovative technologies in a compact 'by-band' RF front-end module gives our handset customers faster time to market, better performance through optimized impedance matching, and greater board-space savings to make room for additional handset features," Ingram added.

The FEM's miniature size also helps manufacturers trim costs via an up to 50 percent savings in board space and an up to 65 percent reduction in parts count, including passive components.

The AFEM-7731 is a fully matched CDMA-1,900MHz FEM, integrating the company's ACPM-7833 E-pHEMT (enhancement-mode pseudomorphic high electron mobility transistor) PA with its miniature ACMD-7401 FBAR (film bulk acoustic resonator) duplexer and all matching circuitry into a 5-by-8-by-1.3mm chip-on-board module.

Compared to designs using separate PAs and duplexers, the RF FEM features higher effective power-added efficiency (PAE) for longer talk time, and high isolation and low loss in the receive band for high sensitivity. It also comes with a 3.4V operation, 380mA current at 24.5dBm linear output power, low quiescent current implemented using fixed and dynamic bias control, and high isolation (low Tx leakage at Rx port).

The AFEM-7731 is presently shipping in prototype quantities to select mobile phone manufacturers, with production volumes scheduled in Q3 2004. Meanwhile, the company is also developing a cell-band CDMA 850MHz RF front-end module, which it expects to ship in volume by Q4 2004.

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