NIST develops a new method for phase and amplitude noise measurements between 100 GHZ. (News Briefs).NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. researchers in Boulder have developed a system for making high-resolution phase-and-amplitude-noise measurements to support the characterization of high performance radars that use digital methods of signal processing See DSP. . The new measurement system, which operates in the frequency range from 10 GHz to 100 GHz, uses the so-called two-channel cross correlation method. The key to making these measurements stems from the generation of extremely stable reference signals which are synthesized by the combination of an ultra-stable sapphire resonator resonator /res·o·na·tor/ (rez´o-na?ter) 1. an instrument used to intensify sounds. 2. an electric circuit in which oscillations of a certain frequency are set up by oscillations of the same frequency in another (oscillator oscillator Mechanical or electronic device that produces a back-and-forth periodic motion. A pendulum is a simple mechanical oscillator that swings with a constant amplitude, requiring the addition of energy at each swing only to compensate for the energy lost because of air ), a set of low-noise regenerative dividers, and a set of cavity-stabilized Gunn oscillators. To date there have been no high-stability reference sources for measurements across this frequency region. CONTACT: Dave Howe, (303) 497-3277; dhowe@boulder.nist.gov. |
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