Pub Date : 1996-03-19DOI: 10.1109/NRSC.1996.551142
S. Kayed, H.F. Ragaei
In both NMOS and CMOS PTL techniques, the problem of noise immunity limits applications which suffer from relatively low logic swings. Noise voltages, can degrade system performance and even produce faulty circuit operation. So, we propose an alternative pass-transistor configurations that directly address noise-immunity. Differential Pass Transistor Logic (DPTL) is a powerful configuration in CMOS technology. DPTL buffers has the ability to generate standard CMOS levels regardless of input signal-swing variation while providing noise immunity by maintaining the structural symmetry.
{"title":"CMOS differential pass-transistor logic (CMOS DPTL) predischarge buffer design","authors":"S. Kayed, H.F. Ragaei","doi":"10.1109/NRSC.1996.551142","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551142","url":null,"abstract":"In both NMOS and CMOS PTL techniques, the problem of noise immunity limits applications which suffer from relatively low logic swings. Noise voltages, can degrade system performance and even produce faulty circuit operation. So, we propose an alternative pass-transistor configurations that directly address noise-immunity. Differential Pass Transistor Logic (DPTL) is a powerful configuration in CMOS technology. DPTL buffers has the ability to generate standard CMOS levels regardless of input signal-swing variation while providing noise immunity by maintaining the structural symmetry.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124983308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-03-19DOI: 10.1109/NRSC.1996.551111
S. El-Khamy, A. El-Gendy
The nuclear electromagnetic pulse (EMP) presents a dangerous threat to electronic systems. We investigate the penetration capabilities of the EMP through a lossy dielectric. A transient solution is presented that takes into consideration the special time function of EMP pulses and the dispersion of the medium. The spectrum and time domain responses of the induced pulses at different depths are computed for different degrees of medium conductivity. The results are of importance in determining the EMP shielding capabilities of different media and to get a measure of the EMP leakage through buildings, antenna radomes and shelters.
{"title":"Penetration of the nuclear electromagnetic pulse (EMP) in lossy dielectric media","authors":"S. El-Khamy, A. El-Gendy","doi":"10.1109/NRSC.1996.551111","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551111","url":null,"abstract":"The nuclear electromagnetic pulse (EMP) presents a dangerous threat to electronic systems. We investigate the penetration capabilities of the EMP through a lossy dielectric. A transient solution is presented that takes into consideration the special time function of EMP pulses and the dispersion of the medium. The spectrum and time domain responses of the induced pulses at different depths are computed for different degrees of medium conductivity. The results are of importance in determining the EMP shielding capabilities of different media and to get a measure of the EMP leakage through buildings, antenna radomes and shelters.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129662011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-03-19DOI: 10.1109/NRSC.1996.551132
O. Ata
The linearisation of a radio basestation amplifier using a third order and a fifth order predistortion scheme is studied. Adaptive predistortion using a third order predistorter improves the power level of the inter-modulation distortion (IMD), which results from amplitude and phase nonlinearities in the amplifier frequency response, by between 6.5 dB and 30 dB, as measured by a two-tone simulation test by exciting the input with a sinusoidal waveform. To keep the sampling rate, as low as possible for speeding up the computation time, the RF carrier signal is avoided since it would have no effect on the simulation results; hence frequency down-conversion to baseband is considered. The variation in improvement is due to changes in the input power level. The improvement increases as the input power is backed off from the 1 dB compression point. A fifth order predistorter will give an IMD improvement of between 17 dB and 45 dB if properly adjusted.
{"title":"An amplifier predistort lineariser for future mobile radio basestations","authors":"O. Ata","doi":"10.1109/NRSC.1996.551132","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551132","url":null,"abstract":"The linearisation of a radio basestation amplifier using a third order and a fifth order predistortion scheme is studied. Adaptive predistortion using a third order predistorter improves the power level of the inter-modulation distortion (IMD), which results from amplitude and phase nonlinearities in the amplifier frequency response, by between 6.5 dB and 30 dB, as measured by a two-tone simulation test by exciting the input with a sinusoidal waveform. To keep the sampling rate, as low as possible for speeding up the computation time, the RF carrier signal is avoided since it would have no effect on the simulation results; hence frequency down-conversion to baseband is considered. The variation in improvement is due to changes in the input power level. The improvement increases as the input power is backed off from the 1 dB compression point. A fifth order predistorter will give an IMD improvement of between 17 dB and 45 dB if properly adjusted.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128871274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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