The APLC series are agile ultra-low phase noise signal generators from kHz to 12.75, 20, 40 and 54 GHz with excellent harmonic and spurious performance. They are available with 1 to 4 phase coherent outputs. These 1-channel and 4-channel units are available as mountable module or in a compact enclosure with display and front panel control. Using the FCP port, frequency and amplitude can be switched within less than 20 µs.