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Title: Characterization of a Track-and-Hold Amplifier for Application to a High Performance SAR

Abstract

A Synthetic Aperture Radar (SAR) which employs direct IF sampling can significantly reduce the complexity of the analog electronics prior to the analog-to-digital converter (ADC). For relatively high frequency IF bands, a wide-bandwidth track-and-hold amplifier (THA) is required prior to the ADC. The THA functions primarily as a means of converting, through bandpass sampling, the IF signal to a baseband signal which can be sampled by the ADC. For a wide-band, high dynamic-range receiver system, such as a SAR receiver, stringent performance requirements are placed on the THA. We first measure the THA parameters such as gain, gain compression, third-order intercept (TOI), signal-to-noise ratio (SNR), spurious-free dynamic-range (SFDR), noise figure (NF), and phase noise. The results are then analyzed in terms of their respective impact on the overall performance of the SAR. The specific THA under consideration is the Rockwell Scientific RTH010.

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
801387
Report Number(s):
SAND2002-2127
TRN: US200303%%212
DOE Contract Number:
AC04-94AL85000
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jul 2002; PBD: 1 Jul 2002
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; AMPLIFIERS; ANALOG-TO-DIGITAL CONVERTERS; COMPRESSION; PERFORMANCE; RADAR; SAMPLING; SIGNAL-TO-NOISE RATIO

Citation Formats

DUBBERT, DALE F., HARDIN, TERRY LYNN, and DELAPLAIN, GILBERT G.. Characterization of a Track-and-Hold Amplifier for Application to a High Performance SAR. United States: N. p., 2002. Web. doi:10.2172/801387.
DUBBERT, DALE F., HARDIN, TERRY LYNN, & DELAPLAIN, GILBERT G.. Characterization of a Track-and-Hold Amplifier for Application to a High Performance SAR. United States. doi:10.2172/801387.
DUBBERT, DALE F., HARDIN, TERRY LYNN, and DELAPLAIN, GILBERT G.. Mon . "Characterization of a Track-and-Hold Amplifier for Application to a High Performance SAR". United States. doi:10.2172/801387. https://www.osti.gov/servlets/purl/801387.
@article{osti_801387,
title = {Characterization of a Track-and-Hold Amplifier for Application to a High Performance SAR},
author = {DUBBERT, DALE F. and HARDIN, TERRY LYNN and DELAPLAIN, GILBERT G.},
abstractNote = {A Synthetic Aperture Radar (SAR) which employs direct IF sampling can significantly reduce the complexity of the analog electronics prior to the analog-to-digital converter (ADC). For relatively high frequency IF bands, a wide-bandwidth track-and-hold amplifier (THA) is required prior to the ADC. The THA functions primarily as a means of converting, through bandpass sampling, the IF signal to a baseband signal which can be sampled by the ADC. For a wide-band, high dynamic-range receiver system, such as a SAR receiver, stringent performance requirements are placed on the THA. We first measure the THA parameters such as gain, gain compression, third-order intercept (TOI), signal-to-noise ratio (SNR), spurious-free dynamic-range (SFDR), noise figure (NF), and phase noise. The results are then analyzed in terms of their respective impact on the overall performance of the SAR. The specific THA under consideration is the Rockwell Scientific RTH010.},
doi = {10.2172/801387},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 2002},
month = {Mon Jul 01 00:00:00 EDT 2002}
}

Technical Report:

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  • Obtaining accurate measurements in noisy environments or measurements with slowly varying background biases can be difficult, and at times impossible, when the background variation has a high dynamic range. Obtaining useful data with resolutions of one part in 10,000 (0.01%) in these types of environments can be simplified through the use of a differential track-and-hold system. A differential technique is described to obtain ground reference correction during real-time high-speed data collection.
  • Existing methods to detect vehicle tracks in coherent change detection images, a product of combining two synthetic aperture radar images ta ken at different times of the same scene, rely on simple, fast models to label track pixels. These models, however, are often too simple to capture natural track features such as continuity and parallelism. We present a simple convolutional network architecture consisting of a series of 3-by-3 convolutions to detect tracks. The network is trained end-to-end to learn natural track features entirely from data. The network is computationally efficient and improves the F-score on a standard dataset to 0.988,more » up fr om 0.907 obtained by the current state-of-the-art method.« less
  • The development of a low power track-and-hold amplifier for low-frequency, high-resolution signal processing applications was investigated. Sample-Hold theory and the use of a track-and-hold as a sample-hold was researched. The use of low power operational amplifiers in track-and-hold amplifiers to achieve the required power consumption and circuit performance was investigated. Three different track-and-hold circuit configurations were then constructed using the low power operational amplifiers. Test procedures for these high resolution track-and-holds were then developed and used to test their performance parameters. Of the three configurations tested the open-loop follower track-and-hold using the OP 22 operational amplifier and DG 309 analogmore » switch gave the best results. This configuration is capable of being used with a 15 bit analog to digital conversion system at sample rates of up to 700 samples per second.« less