Tiny GPS/GNSS LNAs deliver 1dB noise figure for 1mA supply
The two versions are the MAX2679 and MAX2679B, both achieving high gain and low noise figure while maximizing the input-referred 1dB compression point and the 3rd-order intercept point. The MAX2679 offers power gain of 19 dB while consuming 1mA (from a 1.08V to 1.98V supply) and providing a noise figure of 0.95 dB. For even less current, the MAX2679B delivers 16.5 dB power gain while consuming only 650µA and providing 1.03dB noise figure. Both have integrated 50Ω output matching.
As might be expected for such a specifically targeted device, the frequency response is sharply tuned to peak at 1500-1600 MHz; the data sheet shows gain down by around 9 dB by 1200/2000 MHz. The devices come in a 0.83 x 0.83 mm, 4-bump, wafer-level package (WLP). Full layout recommendations and files are available, as is an evaluation board (pictured). The bill of materials for immediately-connected components comprises one inductor, two capacitors and one resistor; plus, there would typically be a SAW filter in the antenna connection.
Maxim Integrated; www.maximintegrated.com/en/products/analog/amplifiers/MAX2679.html
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