New 1.6GHz 2 Stage CMOS LNA for GPS Applications

7th December 2009

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Datasheet

In GPS applications, the LNA is normally placed close to the antenna as the GPS signal received from the GPS satellite tends to be quite weak and needs the LNA to amplify it. This can be achieved by using either a one stage amplifier (about 15dB) or a two stage amplifier (27dB). Two stages increases the amplification capabilities but is often combined with the downside of increasing the noise figure and the power consumption. However, unlike other LNAs, which mainly use either GaAs, SiGe or SiGe BiCMOS processes, the new XC2404 two stage LNA from Torex has been developed using a 0.13m CMOS process which results in an extremely low power consumption figure of only 12mW (Fixed Bias mode).

The XC2404’s noise figure is also an impressive 0.94dB at 1.6GHz making it ideally suited for use with noise sensitive GPS applications. In addition, the XC2404’s Gain is a high 26.5dB, so combining this with the low noise figure and the low power consumption, the XC2404 really does provide an excellent solution.

The XC2404’s operating voltage range is 1.14V~1.26V (1.2V typ.) when operating in Fixed Bias mode but for applications that have higher power supply rails such as 1.8V or 2.85V, the XC2404 can also be used in a Self Bias mode by attaching an external Rbias resistor on the input side to give added flexibility. The XC2404 also offers easy output matching to 50 W.

The XC2404 is available in an ultra low profile USP-8A01 package measuring only 1.5mm x 1.5mm x 0.6mm.