F
Fred L. Walls
Researcher at National Institute of Standards and Technology
Publications - 121
Citations - 3780
Fred L. Walls is an academic researcher from National Institute of Standards and Technology. The author has contributed to research in topics: Phase noise & Noise spectral density. The author has an hindex of 31, co-authored 121 publications receiving 3673 citations. Previous affiliations of Fred L. Walls include United States Department of the Army & University of Washington.
Papers
More filters
Journal ArticleDOI
Fundamental limits on the frequency stabilities of crystal oscillators
Fred L. Walls,John R. Vig +1 more
TL;DR: In this paper, the frequency instabilities of precision bulk acoustic wave (BAW) quartz crystal oscillators are reviewed and the fundamental limits on the achievable frequency stabilities and the degree to which fundamental limits have been approached to date are examined.
Journal ArticleDOI
Measurement of the Short-Term Stability of Quartz Crystal Resonators and the Implications for Crystal Oscillator Design and Applications
TL;DR: In this paper, a new technique is presented which makes it possible to measure the inherent short-term stability of quartz crystal resonators in a passive circuit, and it is shown that with this improved shortterm stability it should be feasible to multiply a crystal controlled source to 1 THz and obtain a linewidth of less than 1 Hz.
Journal ArticleDOI
Measurements of frequency stability
Fred L. Walls,David W. Allan +1 more
TL;DR: The characterization of frequency stability in the time domain and frequency domain are briefly defined and their relationships explained in this article, where techniques for making precise measurements of frequency fluctuations in oscillators, multipliers, dividers, amplifiers, and other components are discussed.
Journal ArticleDOI
Laser-pumped rubidium frequency standards: new analysis and progress
TL;DR: In this paper, the authors achieved a stability of 3/spl middot/10/sup -13/ /spl tau//sup -1/2/ for 3/pl tau/<30 s with a laser-pumped rubidium gas-cell frequency standard by reducing the effects due to noise in the microwave and laser sources.
Journal ArticleDOI
Environmental sensitivities of quartz oscillators
Fred L. Walls,J.-J. Gagnepain +1 more
TL;DR: The physical basis for the sensitivity of precision oscillators to temperature, humidity, pressure, acceleration and vibration, magnetic field, electric field, load, and radiation is examined.