Expanding its family of Xstal-Clear™ oven controlled crystal oscillators (OCXO), Morion has introduced the MV336M double oven controlled crystal oscillator (DOCXO). The MV336M’s combined temperature stability, Allan deviation (ADEV) and phase noise performance makes it ideal for atomic clocks, precision frequency measurement and time-based synchronization maintenance.
The MV336M achieves an ADEV of 1.5 x 10-13 (1 s), phase noise below −120 dBc/Hz at 1 Hz and temperature stability of 4 x 10-11 over the −10°C to +70°C range. As frequency stability versus temperature may influence ADEV for longer than 3 s intervals, the MV336M’s stability facilitates precise and reliable measurements of ADEV from 10 to 100 s. The MV336M improves the phase noise at 0.1 Hz, now specified at −92 dBc/Hz.
The crystal blank’s special surface treatment enables higher yield for superior phase noise and ADEV. The design also reflects studies of crystal surface state and optimum power dissipation and their influence on close-in phase noise. A precise DOCXO requires minimizing the influence of temperature on the oscillator. Frequency stability is determined by the temperature dependence of each element, i.e., the ovens, capacitors, inductances and transistors. Thermal modeling of the oscillator design enables circuit and design solutions to be optimized, significantly improving frequency stability.
The MV336M has analog frequency control; digital frequency tuning with the step size of 1~3 x 10-14 will soon be available. The DOCXO is housed in a 92 mm x 80 mm x 50 mm package and biased with 12 V. A smaller DOCXO (51 mm x 51 mm x 25 mm) with the same performance is being developed.
Morion, based in Saint Petersburg, has been developing quartz devices, from blanks to precision OCXOs, since 1930. Morion-US is an independent California corporation serving the American market.
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