The MODEL 805 frequency synthesizer has multiple applications. The synthesizer utilizes a low-noise amplifier between the 1 GHz reference input and output, which has low additive phase noise, enabling the configuration of up to 16 phase-coherent channels. The relative phase difference variation was ☐.5 degree over 10 hours in a non-airconditioned room. Phase coherence can be determined by the relative phase difference variation between channels set to the same frequency, as shown in Figure 2 where two daisy-chained MODEL 805 modules in a phase-coherent configuration were measured at 5 GHz. To lower costs, MODEL 805 modules can be ordered without the internal OCXO when used with other MODEL 805 modules or an external reference. The first unit acts as the reference, with its 1 GHz frequency being looped through the other units. It also offers a 1 GHz reference output, allowing multiple units to be connected for phase-coherent sources. The MODEL 805 frequency synthesizer supports external references of 100 MHz and 1 GHz with a frequency lock range of ☑0 ppm. The synthesizer has a standard Ethernet port for connecting to a PC and controlling the unit with BNC’s graphical interface software or using SCPI commands. Internal temperature monitoring is available to prevent the synthesizer from exceeding the recommended operating temperature range if that occurs, the RF output stage will turn off. It weighs under 0.5 kg and consumes only 17 W, which enables it to use passive heat sinking, with easy and flexible mounting to a heat sink. The synthesizer is well-shielded in a compact flange-mountable module measuring 134 × 95 × 25 mm. A high speed triggered parameter sweeping function with flexible sweeping profiles is available with the shortest step time The maximum modulation rate is 10 MHz and narrowest pulse width is 30 ns. In addition to providing a CW signal, the MODEL 805 supports pulse modulation, either internally programmable or externally triggerable. Figure 1 shows a comparison of measured single-sideband (SSB) phase noise at 1 and 10 GHz. Subharmonics and spurious signals are below -55 dBc. Its phase noise at a 20 kHz offset from a 1 GHz carrier is -132 dBc/Hz and -110 dBc/Hz at 100 Hz offset. The phase can be adjusted from 0 to 360 degrees with a resolution of 0.1 degree. The adjustable output power ranges from -40 to +25 dBm with an accuracy of ☑.5 dB and a resolution of 0.5 dB. It has a fast switching time of just 5 μs and a calibrated frequency accuracy of ☓0 ppb with ☐.5 ppm aging in the first year thanks to its precise OCXO. The MODEL 805 frequency synthesizer covers a range of 100 kHz to 22 GHz with a resolution of 10 mHz using graphical control software and higher resolution with SCPI commands. The MODEL 805 is user-friendly and its compact design makes it suitable for integration into various forms and layouts of RF/microwave systems. One of its standout features is the ability to link multiple units for phase coherence and multi-channel capabilities in various applications. Berkeley Nucleonics (BNC) presents a new compact frequency synthesizer, the MODEL 805, that delivers precise and stable frequencies from 100 kHz to 22 GHz.
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