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Search Publications by: David A. Howe (Assoc)

Displaying 151 - 175 of 237

Vibration-induced PM Noise in Oscillators and Measurements of Correlation with Vibration Sensors

August 29, 2005

Author(s)

David A. Howe, Justin Lanfranchi, Lauren Cutsinger, Archita Hati, Craig Nelson

We present data which shows correlations between phase fluctuations in a low g-sensitive 10 MHz oven-controlled quartz oscillator (OCXO) and acceleration/vibration sensors. We describe the equipment setup and measurement procedure. Data is in the form of

W-band dual channel AM/PM noise measurement system - an update

August 29, 2005

Author(s)

Archita Hati, Craig Nelson, J Nava, David A. Howe, Fred L. Walls, Huascar Ascarrunz, Justin Lanfranchi, Bill Riddle

We discuss the performance of a W-band (92-96) GHz amplitude modulated (AM) and phase modulated (PM) noise measurement system. The system uses two nearly identical channels to measure the residual noise in amplifiers in pulsed mode with a duty cycle of 10%

Enhancements to GPS Operations and Clock Evaluations using a Total Hadamard Deviation

August 1, 2005

Author(s)

David A. Howe, Ron Beard, C. A. Greenhall, F. Vernotte, W. J. Riley, Trudi K. Peppler

We describe a method based on the Total deviation approach whereby we improve the confidence of the estimation of the Hadamard deviation that is used primarily in GPS operations. The Hadamard-total deviation described in this paper provides a significant

Low Phase Noise Amplifier and Oscillator Using Feed-Forward Technique at 10 GHz

June 1, 2005

Author(s)

Archita Hati, Craig W. Nelson, David A. Howe

We discuss the performance of a feed-forward amplifier (FFA) at 10GHz. The feed-forward method is primarily used to suppress intermodulation distortion in amplifiers to suppress up-converted near-DC noise. The main amplifier in this configuration is a low

Frequency Stability, ed. by K. Chang

January 1, 2005

Author(s)

David A. Howe

This chapter introduces the concept of frequency stability measurements of oscillators by the Allan Deviation and spectral analysis. Examples and typical results are presented. Physical interpretations of common noise processes are discussed.

Ultra-low Noise Cavity Stabilized Microwave Reference Oscillator using an Air-dielectric Resonator

December 7, 2004

Author(s)

Craig Nelson, David A. Howe, A Sen Gupta

Ultra-low noise microwave oscillators are often required to serve as reference signals in precision PM noise measurement systems and in a host of other applications. We have significantly improved the spectral purity of NIST¿s traditional cavity-stabilized

Theo1 Confidence Intervals

August 23, 2004

Author(s)

T Tasset, David A. Howe, Donald B. Percival

Theoretical variance #1 (Theo1) has been developed at NIST to improve the estimation of long-term frequency stability. Its square-root (Theo1-dev) has two significant improvements over the Allan deviation XX called ¿Adev" in estimlating long-term frequency

Theo1: Characterization of very long-term frequency stability

August 23, 2004

Author(s)

David A. Howe, T Tasset

Theo1 is the first new species of variance that addresses a particularly difficult measurement problem, namely, obtaining reliable estimation of frequency stability for sample periods that are long compared to the length of a data run. Theo1 has

W-band dual channel PM/AM noise measurement system

August 23, 2004

Author(s)

Archita Hati, Craig Nelson, J Nava, David A. Howe, Fred L. Walls

We discuss the performance of a W-band (92 to 96 GHz) PM and AM noise measurement system. The system uses two nearly identical channels to measure the AM or P M noise added by an amplifier or any passive component. It is principally designed to measure