Agilent Technologies has introduced what it claims is the industry’s first combined CDMA duplexer/power amplifier front-end module (FEM) for use in dual-band and US PCS (Personal Communications Service) mobile phones and wireless data cards.
The Agilent AFEM-7731 is a fully matched CDMA-1900 MHz FEM, integrating Agilent’s ACPM-7833 E-pHEMT (enhancement-mode pseudomorphic high electron mobility transistor) power amplifier with its miniature ACMD-7401 FBAR (film bulk acoustic resonator) duplexer and all matching circuitry into a compact 5 x 8 x 1.3 mm chip-on-board module.
Compared to designs using separate power amplifiers and duplexers, the AFEM-7731 features higher effective power-added efficiency (PAE) for longer talk time, and high isolation and low loss in the receive band for high sensitivity.
The optimised matching between the power amplifier and duplexer eliminates the need for a bulky and costly isolator, which further reduces the cost and size of the handset.
The AFEM-7731 is now shipping in prototype quantities through Agilent’s direct sales channel to select mobile phone manufacturers. Production volumes are expected by Q3 2004. The price is expected to be similar to the combination of separate Agilent ACPM-7833 (CDMA E-pHEMT power amplifier module) and ACMD-7401 (CDMA FBAR duplexer) devices.
Agilent is also developing a cell-band CDMA 850 MHz RF front-end module, which it expects to ship in volume by Q4 2004.