Date: 27/08/2009

RF power devices for TD-SCDMA wireless networks from Freescale

Freescale has made available of two LDMOS RF power transistors for discrete and integrated circuit (IC) solutions. The LDMOS RF devices are used in power amplifiers based on Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), a third-generation wireless standard networks.

These devices include the MRF7P20040H LDMOS FET and the MD7IC2050N multi-stage integrated power amplifier IC. Both devices are suitable for use in Doherty amplifiers, which consists of two amplifiers that operate under different transmit-signal conditions and typically require separate transistors for each amplifier. And also both these devices are inherently broadband, operates in both bands allocated for TD-SCDMA (1880 to 1920 MHz and 2010 to 2025 MHz), so the same device can be used to provide RF power in both bands.

"Freescale continues its leadership in LDMOS RF technology by offering high performance solutions for customers using TD-SCDMA wireless technology in China," said Gavin Woods, vice president and general manager of Freescale's RF Division. "Freescale is applying its knowledge and leadership in RF power technology to support the specific requirements of TD-SCDMA as the technology is rapidly deployed throughout China."

Other key features of the two devices, including Doherty performance as measured with a six-carrier, 2025 MHz TD-SCDMA, are:

MRF7P20040HS: 50 W peak RF output power; drain efficiency of 43 percent; 18 dB gain at 10 W average output power; and air-cavity ceramic package with internal matching for ease of use.

MD7IC2050N: 70 W peak RF output power; drain efficiency of 35 percent; 29 dB gain at 10 W average output power; and on-chip quiescent current temperature compensation with 50 ohm on-chip input matching in a 225 degree C capable over-molded plastic package.

Both devices are RoHS-compliant, production tested in a symmetrical Doherty amplifier configuration, and provide Electro-Static Discharge (ESD) protection.

For more details visit www.freescale.com/rfpower