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Charles E Stroud - One of the best experts on this subject based on the ideXlab platform.

  • selective Spectrum analysis for Analog measurements
    IEEE Transactions on Industrial Electronics, 2011
    Co-Authors: Jie Qin, Joseph D Cali, Bradley F Dutton, George J Starr, Fa Foster Dai, Charles E Stroud
    Abstract:

    This paper proposes selective Spectrum analysis (SSA) technique that uses two multiplier/accumulators to estimate the Spectrum. It requires much less area overhead than Fast Fourier Transform (FFT) and offers better performance in terms of area overhead, dynamic range, and accuracy than Analog Spectrum estimation techniques. As a result, SSA is a good output response analyzer (ORA) implementation for mixed-signal Built-In Self-Test (BIST). The SSA technique downconverts the device under test output at the interested frequency to dc by multiplication and filters out the undesired ac components through accumulation. But the ac components cannot be completely removed and introduce calculation errors. While these errors can be minimized by controlling the accumulation time, the rate of convergence is low such that long test time is required to achieve reasonable accuracy. An alternate approach is to choose integer multiple periods (IMPs) of the frequency under analysis to stop the accumulation. Performance of the SSA-based ORA is analyzed in a systematic way and it is shown that the proposed IMP circuits can further improve the efficiency of the ORA in terms of test time, area overhead, and measurement accuracy. Experimental results are presented for simulation as well as implementations of the SSA technique in field-programmable gate arrays and standard cell application specific integrated circuits.

F.p. Preparata - One of the best experts on this subject based on the ideXlab platform.

  • Sequencing-by-hybridization revisited: the Analog-Spectrum proposal
    IEEE ACM Transactions on Computational Biology and Bioinformatics, 2004
    Co-Authors: F.p. Preparata
    Abstract:

    All published approaches to DNA sequencing by hybridization (SBH) consist of the biochemical acquisition of the Spectrum of a target sequence (the set of its subsequences conforming to a given probing pattern) followed by the algorithmic reconstruction of the sequence from its Spectrum. In the "standard" or "uniform" approach, the probing pattern is a string of length L and the length of reliably reconstructible sequences is known to be m/sub len/ = O(2/sup L/). For a fixed microarray area, higher sequencing performance can be achieved by inserting nonprobing gaps ("wild-cards") in the probing pattern. The reconstruction, however, must cope with the emergence of fooling probes due to the gaps and algorithmic failure occurs when the Spectrum becomes too densely populated, although we can achieve m/sub comp/ = O(4/sup L/). Despite the combinatorial success of gapped probing, all current approaches are based on a biochemically unrealistic Spectrum-acquisition model (digital-Spectrum). The reality of hybridization is much more complex. Departing from the conventional model, in this paper, we propose an alternative, called the Analog-Spectrum model, which more closely reflects the biochemical process. This novel modeling reestablishes probe length as the performance-governing factor, adopting "semidegenerate bases" as suitable emulators of currently inadequate universal bases. One important conclusion is that accurate biochemical measurements are pivotal to the success of SBH. The theoretical proposal presented in this paper should be a convincing stimulus for the needed biotechnological work.

Jie Qin - One of the best experts on this subject based on the ideXlab platform.

  • selective Spectrum analysis for Analog measurements
    IEEE Transactions on Industrial Electronics, 2011
    Co-Authors: Jie Qin, Joseph D Cali, Bradley F Dutton, George J Starr, Fa Foster Dai, Charles E Stroud
    Abstract:

    This paper proposes selective Spectrum analysis (SSA) technique that uses two multiplier/accumulators to estimate the Spectrum. It requires much less area overhead than Fast Fourier Transform (FFT) and offers better performance in terms of area overhead, dynamic range, and accuracy than Analog Spectrum estimation techniques. As a result, SSA is a good output response analyzer (ORA) implementation for mixed-signal Built-In Self-Test (BIST). The SSA technique downconverts the device under test output at the interested frequency to dc by multiplication and filters out the undesired ac components through accumulation. But the ac components cannot be completely removed and introduce calculation errors. While these errors can be minimized by controlling the accumulation time, the rate of convergence is low such that long test time is required to achieve reasonable accuracy. An alternate approach is to choose integer multiple periods (IMPs) of the frequency under analysis to stop the accumulation. Performance of the SSA-based ORA is analyzed in a systematic way and it is shown that the proposed IMP circuits can further improve the efficiency of the ORA in terms of test time, area overhead, and measurement accuracy. Experimental results are presented for simulation as well as implementations of the SSA technique in field-programmable gate arrays and standard cell application specific integrated circuits.

Jafari Arash - One of the best experts on this subject based on the ideXlab platform.

  • Multicarrier transmission gain and group delay measurements
    2019
    Co-Authors: Jafari Arash
    Abstract:

    This thesis documents the Multi-Carrier Group Delay and gain measurements for OneWeb satellites with frequency translation in satellite communication. The uplink is in the Ka-band and the downlink is in the Ku-band. The transmission gain and absolute group delay measurements are implemented although the local oscillator (LO) is not accessible. These measurements are implemented by using the OneWeb Payload Test System for Radio Frequency Special Check-Out Equipment Electrical Ground Support Equipment (PTS RF SCOE EGSE). The PTS RF SCOE consists of distinct measurement units for various measurement goals. The OneWeb RF SCOE consists of a signal generator, Spectrum analyzer, switch control unit, RF matching unit, RF FrontEnd and a host server to link these components together. For more information about RF SCOE please refer to https://atos.net/en/products/aerospace-defense-electronics/egse. The focus of this document is on multi-carrier gain and group delay measurement of the OneWeb satellite which henceforth will be called the Device Under Test (DUT). The two main measurement units that are utilized to perform the measurements for transmission gain and group delay are two signal generators and a Spectrum analyzer. Having information about the phase and magnitude response of the DUT is sufficient to measure the gain and group delay of the DUT. The Rohde and Schwarz FSW 43 Spectrum analyzer includes an I/Q-Analyzer. The magnitude and phase of the input RF signal are measured by reading I/Q-data from the Spectrum analyzer. Consequently, the measured magnitude and phase are calculated to measure the group delay and gain of DUT with frequency translation. This thesis provides information on how to obtain the necessary parameters from Analog Spectrum Analyzer (ASA) for measuring the transmission gain and absolute group delay. Measuring the gain and group delay need two specific calibrations prior to the multi-carrier transmission gain and absolute group delay measurement. The TAC and multi-carrier calibrations give us the reference gain and phase response versus frequency curves for Multi-Carrier Measurements (MCMs). All specific calculations are performed for accurately estimating the absolute group delay and transmission gain of the DUT. Three possible fast internal calibrations are suggested as a replacement of the repetitive and time-consuming TAC and multi- carrier calibrations. Finally, measuring the transmission gain of the same DUT with different interfaces of the RF front end ends up to constant transmission gain of the DUT.This thesis documents the Multi-Carrier Group Delay and gain measurements for OneWeb satellites with frequency translation in satellite communication. The uplink is in the Ka-band and the downlink is in the Ku-band. The transmission gain and absolute group delay measurements are implemented although the local oscillator (LO) is not accessible. These measurements are implemented by using the OneWeb Payload Test System for Radio Frequency Special Check-Out Equipment Electrical Ground Support Equipment (PTS RF SCOE EGSE). The PTS RF SCOE consists of distinct measurement units for various measurement goals. The OneWeb RF SCOE consists of a signal generator, Spectrum analyzer, switch control unit, RF matching unit, RF FrontEnd and a host server to link these components together. For more information about RF SCOE please refer to https://atos.net/en/products/aerospace-defense-electronics/egse.Arash JafariAbweichender Titel nach Übersetzung der Verfasserin/des VerfassersTechnische Universität Wien, Diplomarbeit, 2019(VLID)456946

  • Messung des Gewinns und der Gruppenlaufzeit für Mehrträgerübertragung
    'Universidad Norbert Wiener', 2019
    Co-Authors: Jafari Arash
    Abstract:

    Abweichender Titel nach Übersetzung der Verfasserin/des VerfassersThis thesis documents the Multi-Carrier Group Delay and gain measurements for OneWeb satellites with frequency translation in satellite communication. The uplink is in the Ka-band and the downlink is in the Ku-band. The transmission gain and absolute group delay measurements are implemented although the local oscillator (LO) is not accessible. These measurements are implemented by using the OneWeb Payload Test System for Radio Frequency Special Check-Out Equipment Electrical Ground Support Equipment (PTS RF SCOE EGSE). The PTS RF SCOE consists of distinct measurement units for various measurement goals. The OneWeb RF SCOE consists of a signal generator, Spectrum analyzer, switch control unit, RF matching unit, RF FrontEnd and a host server to link these components together. For more information about RF SCOE please refer to https://atos.net/en/products/aerospace-defense-electronics/egse. The focus of this document is on multi-carrier gain and group delay measurement of the OneWeb satellite which henceforth will be called the Device Under Test (DUT). The two main measurement units that are utilized to perform the measurements for transmission gain and group delay are two signal generators and a Spectrum analyzer. Having information about the phase and magnitude response of the DUT is sufficient to measure the gain and group delay of the DUT. The Rohde and Schwarz FSW 43 Spectrum analyzer includes an I/Q-Analyzer. The magnitude and phase of the input RF signal are measured by reading I/Q-data from the Spectrum analyzer. Consequently, the measured magnitude and phase are calculated to measure the group delay and gain of DUT with frequency translation. This thesis provides information on how to obtain the necessary parameters from Analog Spectrum Analyzer (ASA) for measuring the transmission gain and absolute group delay. Measuring the gain and group delay need two specific calibrations prior to the multi-carrier transmission gain and absolute group delay measurement. The TAC and multi-carrier calibrations give us the reference gain and phase response versus frequency curves for Multi-Carrier Measurements (MCMs). All specific calculations are performed for accurately estimating the absolute group delay and transmission gain of the DUT. Three possible fast internal calibrations are suggested as a replacement of the repetitive and time-consuming TAC and multi- carrier calibrations. Finally, measuring the transmission gain of the same DUT with different interfaces of the RF front end ends up to constant transmission gain of the DUT.This thesis documents the Multi-Carrier Group Delay and gain measurements for OneWeb satellites with frequency translation in satellite communication. The uplink is in the Ka-band and the downlink is in the Ku-band. The transmission gain and absolute group delay measurements are implemented although the local oscillator (LO) is not accessible. These measurements are implemented by using the OneWeb Payload Test System for Radio Frequency Special Check-Out Equipment Electrical Ground Support Equipment (PTS RF SCOE EGSE). The PTS RF SCOE consists of distinct measurement units for various measurement goals. The OneWeb RF SCOE consists of a signal generator, Spectrum analyzer, switch control unit, RF matching unit, RF FrontEnd and a host server to link these components together. For more information about RF SCOE please refer to https://atos.net/en/products/aerospace-defense-electronics/egse.11

Fa Foster Dai - One of the best experts on this subject based on the ideXlab platform.

  • selective Spectrum analysis for Analog measurements
    IEEE Transactions on Industrial Electronics, 2011
    Co-Authors: Jie Qin, Joseph D Cali, Bradley F Dutton, George J Starr, Fa Foster Dai, Charles E Stroud
    Abstract:

    This paper proposes selective Spectrum analysis (SSA) technique that uses two multiplier/accumulators to estimate the Spectrum. It requires much less area overhead than Fast Fourier Transform (FFT) and offers better performance in terms of area overhead, dynamic range, and accuracy than Analog Spectrum estimation techniques. As a result, SSA is a good output response analyzer (ORA) implementation for mixed-signal Built-In Self-Test (BIST). The SSA technique downconverts the device under test output at the interested frequency to dc by multiplication and filters out the undesired ac components through accumulation. But the ac components cannot be completely removed and introduce calculation errors. While these errors can be minimized by controlling the accumulation time, the rate of convergence is low such that long test time is required to achieve reasonable accuracy. An alternate approach is to choose integer multiple periods (IMPs) of the frequency under analysis to stop the accumulation. Performance of the SSA-based ORA is analyzed in a systematic way and it is shown that the proposed IMP circuits can further improve the efficiency of the ORA in terms of test time, area overhead, and measurement accuracy. Experimental results are presented for simulation as well as implementations of the SSA technique in field-programmable gate arrays and standard cell application specific integrated circuits.