Avago designs duplexer for UMTS Band 2 handsets

The ACMD-7407 duplexer, which is the latest addition to Avago's range of PCS duplexers, is 33 per cent smaller than its previous versions.

Designed using Avago's own FBAR technology, this UMTS duplexer has a common footprint and targets designers of PCS handsets, and data terminals operating on the US PCS frequency band.

The ACMD-7407 is a low insertion loss, high isolation duplexer that was developed using Avago's Microcap bonded-wafer chip scale packaging technology.

This process enabled the UMTS PCS duplexer to be assembled in a moulded chip-on-board module that is less than 0.9mm high with a footprint of 2mm by 2.5mm.

Additionally, the ACMD-7407 duplexer is said to enhance the sensitivity and dynamic range of PCS receivers by providing more than 55dB isolation of the transmitted signal at the receiver input, and more than 47dB rejection of transmit-generated noise in the receive band, thus enabling the removal of interstage Tx and Rx filters.

Avago's ACMD-7407 provides best insertion loss capabilities to minimise power consumption and achieve optimum receiver sensitivity.

The maximum insertion loss in the Tx channel is only 2.7dB, which minimises current drain from the power amplifier.

Insertion loss in the Rx channel is 3.2dB maximum to improve receiver sensitivity.

The power handling capability of the FBAR bulk-mode resonators supports the high output power levels needed in PCS handsets while adding virtually no distortion.