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Search Publications by: David A. Howe (Assoc)

Displaying 76 - 100 of 125

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

January 1, 2006

Author(s)

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

Merits of PM Noise Measurement Over Noise Figure: A Study at Microwave Frequencies

January 1, 2006

Author(s)

Archita Hati, David A. Howe, F L. Walls, D. Walker

TheoH and Allan Deviation as Power-Law Noise Estimators

January 1, 2006

Author(s)

J Mcgee, David A. Howe

TheoH Bias-Removal Method

January 1, 2006

Author(s)

David A. Howe, J Mcgee-taylor, Tiffany Tassett

TheoH: a hybrid, high-confidence, statistic that improves on the Allan deviation

January 1, 2006

Author(s)

David A. Howe

Comparison and Status of Low-noise X-band Oscillator and Amplifier Technologies

August 29, 2005

Author(s)

David A. Howe, Archita Hati

his study compares the phase noise of different classes of oscillators and amplifiers that work at X-band. Best-in-class results are presented based on recent measurements at NIST. In particular, comparisons are made between mature technologies of

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

Frequency Uncertainty Analysis for Josephson Voltage Standard

January 1, 2004

Author(s)

Y Tang, Michael A. Lombardi, David A. Howe

High-Spectral Purity Microwave Oscillator: Design Using Conventional Air-Dielectric Cavity

January 1, 2004

Author(s)

A Sen Gupta, David A. Howe, Craig Nelson, Archita Hati, F L. Walls, J F. Garcia-nava

Theo1 Confidence Intervals

January 1, 2004

Author(s)

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

Theo1: Characterization of Very Long-Term Frequency Stability

January 1, 2004

Author(s)

David A. Howe, T Tasset

100-GHz Cooled Amplifier Residual AM and PM Noise Measurements, Noise Figure and Jitter Calculations

November 1, 2003

Author(s)

David A. Howe, J R. Ostrick

We report the first definitive PM and AM noise mea-surements at 100 GHz of indium phosphide (InP) amplifiers oper-ating at 5 K, 77 K, and room temperature. Amplifier gain ranged from +7to+30 dB, depending on input RF power levels and op-erating bias

Clock Jitter Estimation based on PM Noise Measurements

January 1, 2003

Author(s)

David A. Howe, T Tasset

"Jitter" is the noise modulation due to random time shifts on an otherwise ideal, or perfectly on-time, signal transition. In the absence of ultra-high-speed jitter analyzers, spectrum analysis is an alternate noise measurement for timing jitter

High-Spectral-Purity Microwave Oscillator: Design Using Conventional Air-Dielectric Cavity

January 1, 2003

Author(s)

A Sen Gupta, David A. Howe, Craig Nelson, Archita Hati, F L. Walls, J F. Garcia nava

We report exceptionally low PM and AM noise levels from a microwave oscillator that uses a conventional air-dielectric cavity resonator as a frequency discriminator. Our approach is to increase the discriminator's intrinsic signal-to-noise ratio by use of

Noise Figure vs. PM Noise Measurements: A Study at Microwave Frequencies,

January 1, 2003

Author(s)

Archita Hati, David A. Howe, F L. Walls, D. Walker

This paper addresses two issues: (i) it compares the usefulness of phase-modulation (PM) noise measurements vs. noise figure (NF) measurements in characterizing the merit of an amplifier, and (ii) it reconciles a general misunderstanding in using -174 dBc

Residual PM and AM Noise Measurements, Noise Figure and Jitter Calculations of 100 GHz Amplifiers

January 1, 2003

Author(s)

David A. Howe, J R. Ostrick

We report the first definitive PM and AM noise measurements at 100 GHz of indium phosphide (InP) amplifiers operating at 5 K, 77 K, and room temperature. Amplifier gain ranged from +7 dB to +30 dB, depending on input RF power levels and operating bias

Very Long-term Frequency Stability: Estimation using a Special-purpose Statistic

January 1, 2003

Author(s)

David A. Howe, Trudi K. Peppler

We introduce a statistic that can be used for a particularly diﬃcult measurement prob-lem, namely, determining frequency stability for fre-quency standards and oscillators for averaging times longer than those the traditional Allan deviation can estimate.