Computer Science – Performance
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.340..293e&link_type=abstract
In ESA, Frequency and Time Forum p 293-296 (SEE N93-24978 09-70)
Computer Science
Performance
Crystal Oscillators, Design Analysis, Frequency Stability, Frequency Standards, Luminaires, Military Technology, Rubidium, Ttl Integrated Circuits, Airborne Equipment, Electromagnetic Interference, Electromagnetic Noise, Magnetic Shielding, Performance Tests, Reliability
Scientific paper
A military rubidium frequency standard model TF-4020A is described and analyzed. It is a compact (volume less than 500 cc) military rubidium standard and meets MIL-E-5400 (airborne electronic equipment) class 2 (-55 C to +71 C, 70,000 ft). The physics package shown is extremely small (87 cc) and comprises lamp and cavity subassembly and a twofold magnetic field. The oscillator is a miniature oven controlled crystal oscillator with a SC (Stress Compensated) cut crystal for a low vibration susceptibility. The main effort during the design process was concentrated on the design of reliable circuits: general reliability, stability and low susceptibility to external and internal influences like temperature, vibration and electromagnetic interference (EMI). Key features of the unit are: compact design; extremely small physics package (87 cc) with a special rugged design to withstand strong vibration; high stability over the wide operating temperature range of -55 C to +71 C; low susceptibility to EMI; low sensitivity to external DC and AC magnetic field; excellent short term stability of 7 x 10(exp -12)/square root of tau for tau greater than 0.1 s and less than 300 s; excellent long term stability of 1 x 10(exp -11) per month; and versatility to adopt versions without size increase.
Eltsufin E.
Stern Ady
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