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Freescale rolls RFICs for WiMAX base stations

Posted: 27 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:Freescale RFICs? WiMAX? base stations?

Freescale Semiconductor has unveiled three new high-power RFICs for WiMAX base stations, pushing its LDMOS and overmolded plastic packaging technology up into the 2.7 and 3.5GHz bands. Because overmolded plastic has a tighter tolerance, base station amplifier designers can keep their PCB slots to tighter tolerances, thus reducing manufacturing variation.

The three new Freescale RFICs include the MW7IC2725N and the MW7IC2750N operating from 2.3 to 2.7GHz, and the MW7IC3825N operating from 3.4 to 3.6GHz. All three integrate two stages of gain and are manufactured using Freescale's seventh-generation high-voltage (HV7) LDMOS process technology.

The main difference between the two devices for the 2.3 to 2.7GHz band is output power. When asked why there were not two versions for the 3.4 to 3.6GHz band, Daniel Ong, Freescale's Product Manager supporting the WiMAX portfolio explained that the 2.3 to 2.7GHz band had more variation in terms of power level requirements, "The power levels being used in the other band are much lower at this point, but we expect them to increase. So, we will address this in the future."

The company reports that in most cases, the higher RF output power of the RFICs allows for the elimination of the predriver stage in WiMAX base stations. For instance, Ong notes that a 2.7GHz discrete device offers 17dB gain while the new Freescale devices provide between 25 and 28dB gain. The devices also can be used along with discrete LDMOS FETs to produce even more RF output power.

Below are the specifics:

?All three devices operate from a 28 to 32Vdc supply and handle a VSWR of 10:1 at 32Vdc while delivering their rated CW output power. They also incorporate ESD protection.

?MW7IC2725N: 25W CW output power at 1dB gain compression point (P1dB) and at 4W average power; 28dB gain, 17 percent efficiency, adjacent channel power ratio (ACPR) at 5.25MHz offset of -50dBc in 500kHz channel bandwidth

?MW7IC2750N: 50W CW output power at 1dB gain compression point (P1dB) and at 8W average power; 26dB gain, 17 percent efficiency, ACPR at 5.25MHz offset of -49dBc in 500kHz channel bandwidth

?MW7IC3825N: 25W CW output power at 1dB gain compression point (P1dB) and at 5W average RF output power; 23.5dB gain, 15 percent efficiency, ACPR at 5.25MHz offset of -49dBc in 500kHz channel bandwidth

The MW7IC2725N, MW7IC2750N and MW7IC3825N devices are sampling now and full production is expected in Q1 2008.

- Janine Love
RF Designline




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