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RFMD rolls out TxM for GSM, GPRS handsets

Posted: 01 Mar 2004 ?? ?Print Version ?Bookmark and Share

Keywords:rf micro devices? rfmd? transmit module? txm? rf3177?

RF Micro Devices Inc. (RFMD) has introduced a highly integrated transmit module (TxM) for quad-band GSM/GPRS cellular handsets.

Measuring 9-by-10-by-1.5mm and packaged in a low-cost, laminate-based module, the RF3177 includes a quad-band power amplifier (PA), integrated power control, pHEMT antenna switch functionality with four independent receive ports (Rx), as well as all associated filtering, duplexing and control functions.

The device requires no external matching components and simplifies handset design by eliminating the PA-to-switch matching design effort, thereby accelerating handset manufacturers' time to market and full type approval. The transmit module further simplifies customers' handset designs by enabling a single device to be used in all four GSM bands (GSM, EGSM, DCS and PCS).

Designed for use as the final component of the transmit chain in GSM 850, EGSM 900, DCS and PCS handheld digital cellular equipment, the module's fully integrated silicon CMOS power control loop meets all spectrum and burst-timing requirements, with 50-ohm I/O terminals. Its integrated power control function eliminates the need for directional couplers, detector diodes, power control ASICs, and other power control circuitry.

Manufactured using the company's gallium arsenide heterojunction bipolar transistor (GaAs HBT) for the power amplifier, silicon CMOS for the integrated power control and pseudomorphic high electron mobility transistor (pHEMT) for the switch, the RF3177 includes software tools that allow engineers to calculate ramp profiles instantly and reduce development time by months.

The device is priced at $2.99 in volumes of 10,000 units.





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