RF Power Modules for GSM Mobile Telephones

SGS-THOMSON Microelectronics has introduced a new hybrid RF module designed for use in GSM mobile transmitters. The STM915-14 is a quasi-linear RF power amplifier module that operates at 12.5V and delivers a minimum output power of 14W over the 890-915MHz frequency range.

The STM915-14 is built using silicon NPN transistors which combine basic 3GHz geometries with shallow ion implantation and high levels of emitter ballasting. This results in a linear class AB module with a minimum gain of 41.5dB and a maximum harmonic distortion of -45dBc at full output power.

Offering excellent stability, with all spurious outputs more than 60dB below the carrier, the STM915-14 can withstand a 10:1 VSWR load mismatch without degradation in output power. The use of diffused emitter ballast resistors and refractory gold metallization ensures low thermal resistance and long-term reliability under Class AB operation.

Mobile communications systems are an important part of SGS-THOMSON's strategy in the RF market and the company offers a range of RF power transistors and modules covering mobile, handheld and base station power levels, for European and American frequency standards.

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