AnaPico Switzerland recently introduced a compact, broadband frequency synthesizer for generating accurate and stable CW and pulsed signals between 100 kHz and 22 GHz. The APMSYN22 achieves −132 dBc/Hz phase noise at 20 kHz offset from a 1 GHz carrier, and subharmonics are below −60 dBc. Frequency resolution is 10 mHz, and the synthesizer switches between frequencies within about 10 µs. The unit’s output power range is −40 to +25 dBm and can be set with a resolution of 0.5 dB.
The synthesizer supports external references of 100 MHz and 1 GHz. Multiple units can be synced to create phase-coherent sources. One synthesizer will generate a 1 GHz reference that is looped through the other synthesizers. To illustrate the performance, with all channels set to 5 GHz, the inter-channel phase difference variation will remain within approximately ±0.5 degrees over 10 hours.
An Ethernet interface enables connection to a local or remote PC, where the unit can be controlled using AnaPico’s GUI software or SCPI commands. The synthesizer is enclosed in a compact, well shielded, flange-mountable housing measuring 125 × 100 × 20 mm and weighing less than 0.5 kg. It consumes just 17 W so the design uses passive cooling.
The APMSYN22 is suitable for many applications, including as a system clock source or in multi-channel phase-coherent configurations for radar, beamforming, spectroscopy and quantum computing. The combination of phase coherence and fast switching also, makes the synthesizer well suited for electronic warfare applications.