As previously mentioned, the STuW81300 is a dual Integer-N and Fractional-N architecture synthesizer that covers a frequency range from 1.925 to 16 GHz. It has two separate outputs, one covers from 1.925 to 8 GHz and includes a divide by two function, the other output features an integrated frequency doubler which will double the output frequency to cover the range from 7.7 GHz to 16 GHz. The STuW81300 integrates four VCOs which can operate from 3.85 GHz up to 8 GHz. An additional feature is a divide by two block which allows the device to output 1.925 GHz on the low end by running the lowest frequency VCO at 3.85 GHz and dividing by two.  Likewise, on the high end, the highest frequency VCO can be run at 8 GHz and by using the integrated frequency doubler, a 16 GHz output is obtained. In this way, the STuW81300 can cover the full range from 1.925 GHz up to 16 GHz. The device has good performance with a PLL figure of merit of -227 dB and also features very good phase noise performance. The phase noise for the VCOs is -131 dBc/Hz at a 1 MHz offset for a 6 GHz carrier, and for a 12 GHz carrier it is -125 dBc/Hz at a 1 MHz offset. The STuW81300 also features an exact frequency mode for frequency accuracy. The STuW81300 is fabricated in ST’s 250 nm silicon-germanium BiCMOS process, and is provided in a 6x6 36-pin package.