Ultra Stable Oscillator

Space qualified Time Oscillator

USO-FF

Proven on Deep space applications

AccuBeat’s USO is a high-stability quartz crystal oscillator utilizing a high Q crystal resonator and high temperature stability in the range of 100µ kelvin. The USO designed by AccuBeat, has an Allan Deviation substantially better than the required spec of 5E-13 at integration constants of 1 to 1000 seconds, making it the most stable oscillator of its type designed for deep space exploration as can be seen in the following graph. (Note that the glitch at the beginning is due to the inaccuracy of the Hydrogen MASER reference at 1 second). AccuBeat’s USO has been designed to meet this specification while subjected to demanding EMC effects and the harsh environment around Jupiter with radiation levels reaching as high as 100kRad on some internal components.

Product Highlights

6E-13/1000 sec
Frequency Stability

 -119 dBc/Hz @1KHz
Phase Noise

7E-11 in 24hrs
Frequency Aging

Performance

Performance
Frequency Stability (ADEV)5E-13 @ 1 sec
5E-13 @ 10 sec
5E-13 @ 100 sec
6E-13 @ 1000 sec
Phase Noise-80 dBc/Hz @ 1 Hz
-100 dBc/Hz @ 10 Hz
-117 dBc/Hz @ 100 Hz
-119 dBc/Hz @ ≥1000 Hz
Frequency Aging7E-11 in 24 Hours
Temperature RangeOperational:-20⁰C to +50⁰C
Non Operational:-30⁰C to +60⁰C
Power RequirementsNominal (steady-state under
vacuum) power input
≤6.5W
Peak power allocation
(warm-up)
≤8W
Input VoltageNominal Input Voltage+28.0 Vdc ± 0.14V
Input Voltage Range+26.5 to +29.0 Vdc
Inrush current (peak current)≤1 A
Functional SpecificationsNominal frequency (f0) for 2 outputs57.51852 MHz
Signals CharacteristicsSource impedance50 Ω
RF level+0 dBm ± 1.0 dB
Harmonics of f0≤ -30 dBc
Harmonics of f0/12≤ -30 dBc
Spurious≤ -80 dBc above 10 kHz from carrier

Additional product specifications, outline drawings and block diagrams and test data are available on request.

USO Key Features

  • Allan deviation below 5E-13 at integration constants of 1 to 1000 seconds
  • High temperature stability in the range of 100µ kelvin
  • Meets requirements for Deep Space EMC and Radiation levels

USO Key Applications

  • Uncrewed Deep Space
Deep Space AccuBeat

Customized configurations are available, contact us to learn more.

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