By utilising noise-optimised third and fifth overtone SC-cut crystals and noise-minimised electronic circuits, KVG has designed new RF OCXOs at frequencies of 80 MHz, 100 MHz, 120 MHz and 125 MHz that provide very low phase noise.
For a 100 MHz output signal, the phase noise at 100 Hz from the carrier is better than -130 dBc/Hz (optional
–135 dBc/Hz); at 1 kHz it is -155 dBc/Hz (optional
-160 dBc/Hz) and at 10 kHz distance -165 dBc/Hz.
The new OCXOs show good frequency stability of ±20 ppb in the temperature range of -20°C to +70°C; long term stability (ageing) is better than ±1 ppm within 15 years. Extended temperature range versions are available on request.
The parts are either housed in an hermetically sealed European standard package size of 36 x 24 x 20 mm for the through-hole part; or in a 25 x 22 x 20 mm SMD package.
The parts are targeted at communication technology applications that need enhanced short-term stability and phase noise performance, such as reference clocks for microwave signal sources, professional satellite receivers, radar applications and many measurement and medical applications (magnetic resonance imaging). Due to the hermetically sealed package, they are suitable for applications with demanding environmental requirements (humidity, dust), as required for many military or avionic applications.
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