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wirelessZONE Products for the week of January 21, 2008
Avago Technologies Says…
PCS Duplexer Minimizes Power Consumption and Improves Receiver Sensitivity
FBAR Innovation Drives Smaller Size, Greater Performance
Avago Technologies announced availability of its 4th generation PCS duplexer. The company is a leading supplier of interface components for communications, industrial and consumer applications. Avago’s ACMD-7403 offers best in class transmitter insertion loss to minimize power consumption and superior receiver insertion loss for excellent receiver sensitivity. Nearly forty percent smaller than previous generation products, the new PCS duplexer is designed for CDMA and UMTS mobile phone, data card, modem and femtocell applications.
Leveraging its market leading film bulk acoustic resonator (FBAR) technology, Avago’s ACMD-7403 delivers an industry best 2.7 dB maximum Tx Band insertion loss which significantly lowers power consumption. An unprecedented 3.2 dB maximum Rx Band insertion loss achieves excellent receiver sensitivity. Additionally, the ACMD-7403 enhances the sensitivity and dynamic range of CDMA and UMTS receivers by providing more than 52 dB attenuation of the transmitted signal at the receiver input and more than 44 dB rejection of transmit-generated noise in the receive band.
EN-Genius Says…
We first wrote about FBAR when reviewing the first, then Agilent, filter using this MEMS technology. In May 2002, we said: “The ACPF-7001 has winner all over it and you should expect to see almost universal adoption in PCS-band handsets. No doubt there are other duplexers/filters in the offing and we should certainly expect to see a duplexer combined with a power module in the near future.” Certainly, from that point on, anybody who invested in SAW filter technology (how do you spell TriQuint?) would have had to have been blind. We never did get the combined RF amplifier and duplexer, which is a shame, but Agilent did get a Product Of The Year Award from us.
Nearly six years further along and we have a 4th generation product manufactured in FBAR, the ACMD UMTS Band II/PCS duplexer. The ACMD-7403 reduces the footprint of the duplexer by 40% to 3.0 mm x 3.0 mm, but the specifications just get better.
Transmit insertion loss hovers around 1 dB from band edge at 1850.5 MHz up to peaking (obviously deliberate, to slow the fall-off) at about 1890 MHz, falling to about -1.5 dB at 1909.5 MHz. Return loss at the transmit port, across the band, is never worse than -16 dB and the rejection in the receive band is never worse than -45 dB. For the receive channel insertion loss is about -1.8 dB at 1930.5 MHz, improves slowly to about 1.2 dB from 1960 MHz to 1970 MHz and then increases again to just under 2 dB at 1989.5 MHz band edge. Return loss is never worse than -13 dB at the receive port and rejection of the transmit channel is almost 60 dB across the whole band.
The other significant number is the return loss at the antenna port where Avago obtains numbers better than -12 dB across both transmit and receive bands – quite amazing! The transmit channel power rating is +33 dBm absolute maximum.
Is this product going to sell? By the millions, and with the speed of re-designs in the mobile business, particularly in adopting any component that saves PCB real estate, the ramp up should be quite quick.
The ACMD-7403 is in production in Pb-free packaging and is priced at $2.13 in 10-k piece lots.
Data Sheet
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