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| 11. |
Comparison of gain, bandwidth and noise figure of variable-reactance amplifiers and convertors |
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Proceedings of the IEE - Part B: Electronic and Communication Engineering,
Volume 107,
Issue 33,
1960,
Page 305-310
J.D.Pearson,
J.E.Hallett,
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PDF (652KB)
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摘要:
Formulae are derived for the gain-bandwidth products and noise figures of a variable-reactance amplifier and a convertor. It is shown that for equal gains and noise figure the convertor has a greater bandwidth than the amplifier. This is confirmed experimentally with a circuit operated as a straight amplifier and a convertor.
DOI:10.1049/pi-b-2.1960.0120
出版商:IEE
年代:1960
数据来源: IET
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| 12. |
A study of atmospheric radio noise received in a narrow bandwidth at 11 Mc/s |
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Proceedings of the IEE - Part B: Electronic and Communication Engineering,
Volume 107,
Issue 33,
1960,
Page 311-319
C.Clarke,
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PDF (1100KB)
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摘要:
Equipment is described for studying atmospheric radio noise by means of continuous-film photography and by measuring the amplitude probability distributions by a pulse-counting technique. Results are given for observations in England during the summer and autumn of 1956. The observations were made in a bandwidth of 400 c/s.No simple mathematical representation of the amplitude probability distribution has been found which will fit all conditions, and a graphical presentation is suggested as a means of providing communication engineers with the required data.The high-frequency radiation consists of a burst of quasi-continuous noise throughout the duration of the flash. This suggests that a burst-duration distribution may be a useful additional measurement in defining the interference effect of the noise.
DOI:10.1049/pi-b-2.1960.0121
出版商:IEE
年代:1960
数据来源: IET
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