The APSYN420 is a wideband low phase-noise synthesizer operating from 10 MHz to 20 GHz. The nominal output power is +23 dBm. The module has a mili-Hz frequency resolution and uses a high-stability internal reference. The internal reference can be phase-locked to a user-settable external reference. For highest phase coherence, multiple APSYN420s can be cascaded with just one master reference clock. The APSYN420 offers dedicated sweeping capabilities with switching speeds of only 25 μs and wideband frequency modulation as well as narrow pulse modulation.