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5 GHz SiGe Low Noise Amplifier Provides 1.8 dB for 802.11a

Fri, 04/06/2001 - 5:21am

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Maxim Integrated Products introduced a 5 GHz SiGe LNA optimized for 802.11a and HiperLAN2 WLAN systems. The MAX2648 provides 17 dB gain, 1.8 dB noise figure, and 0 dBm input IP3 at 5.2 GHz while consuming 12mA. The high gain, low noise, and high linearity performance make it flexible for use as a first stage LNA, an LO buffer, or a transmitter driver amplifier.

The MAX2648 is designed on a proprietary low noise, advanced silicon germanium (SiGe) process optimized for high-frequency applications. The LNA's 17 dB gain and 1.8 dB noise figure compare favorably to the performance offered by more expensive GaAs ICs, which typically have 12 dB to 15 dB of gain and a 2.5 dB noise figure.

Compared to discrete designs, the MAX2648's integrated active bias network saves one transistor and three passive components, while maintaining stable RF performance over supply and temperature variations. The LNA is packaged in the small 2 × 3 UCSP (ultra chip scale package) measuring 1.0 mm × 1.5 mm. Total board space required is 11 mm2. A fully assembled evaluation kit (MAX2648EVKIT) is available to help reduce design time.

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