期刊
ASTRONOMY & ASTROPHYSICS
卷 391, 期 3, 页码 1185-1197出版社
E D P SCIENCES
DOI: 10.1051/0004-6361:20020880
关键词
cosmology : cosmic microwave background, observations; instrumentation : detectors; methods : analytical
We use an analytic approach to study the susceptibility of the PLANCK Low Frequency Instrument radiometers to various systematic effects. We examine the effects of fluctuations in amplifier gain, in amplifier noise temperature and in the reference load temperature. We also study the effect of imperfect gain modulation, non-ideal matching of radiometer parameters, imperfect isolation in the two legs of the radiometer and back-end 1/f noise. We find that with proper gain modulation 1/f gain fluctuations are suppressed, leaving fluctuations in amplifier noise temperature as the main source of 1/f noise. We estimate that with a gain modulation factor within +/- 1% of its ideal value the overall 1/f knee frequency will be relatively small (<0.1 Hz).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据