STI-05-08-S1 is a F-Band phase noise analyzer (PNA) down-converter that converts millimeterwave (mmW) signals from a frequency range of 90 to 140 GHz to the baseband at 10 MHz to 1.6 GHz. The down-converter requires two +3 dBm driving power as its LO input signals at 11.25 to 17.5 GHz from the PNA. The down-converter then convert the DUT mmW signals up to +10 dBm to two IF outputs feeding low frequency PNA, such as Anapico’s APPH equipment, for phase noise analysis. The down-converter has low harmonic levels and excellent gain flatness, extending the microwave PNA to perform the phase noise testing beyond 50 GHz. Various models are available in full waveguide bands, from WR-15 to WR-03 are available to cover the frequency range of 50 to 330 GHz.