2000
DOI: 10.1109/19.863931
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High sensitivity noise measurement with a correlation spectrum analyzer

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Cited by 35 publications
(22 citation statements)
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“…1(b), measure the correlated noise between the two channels, rejecting a large portion of the uncorrelated amplifier noise. Residual cross talk 17,21 between the two channels offsets the data by 2.6 K.…”
mentioning
confidence: 99%
See 1 more Smart Citation
“…1(b), measure the correlated noise between the two channels, rejecting a large portion of the uncorrelated amplifier noise. Residual cross talk 17,21 between the two channels offsets the data by 2.6 K.…”
mentioning
confidence: 99%
“…Previously, cross-correlation measurements were limited to frequencies below a few MHz due to the practical implementation of multipliers and digital processing speeds. 18,20,21 The 2 GHz analog multiplier and LNA, combined with the lock-in amplifier modulation scheme described in Fig. 1(b), measure the correlated noise between the two channels, rejecting a large portion of the uncorrelated amplifier noise.…”
mentioning
confidence: 99%
“…It can be shown that the effective noise power added by the system decreases with 1.5 dB for every doubling of measurement time [9]- [11], and can be reduced by as much as 50 dB [9].…”
Section: Cross-correlationmentioning
confidence: 99%
“…Using cross-correlation to lower system noise is not a new idea; it is in widespread use in radio-astronomy [12], it has been used in [9] to measure the thermal noise of a resistor, and it is briefly mentioned in [13] as more robust in the presence of noise uncertainty. In communications literature the content seems to be limited.…”
Section: Cross-correlationmentioning
confidence: 99%
“…13 The second approach consists of using measurement methods which take advantage of the uncorrelation between the noise due to the device under test and the noise introduced by the preamplifiers, in order to obtain a background noise of the entire measurement system significantly lower with respect to the noise due to the preamplifiers. [14][15][16][17] Recently, we have proposed a high sensitivity method for voltage noise measurements, which allows, at least in principle, the complete elimination of the noise introduced by the amplifiers used for the measurements. 18 In this work, starting from the same basic idea, we have developed and experimentally validated a high sensitivity method for current noise measurements, which allows, at least in principle, the complete elimination of the noise introduced by the measurement amplifiers.…”
Section: Introductionmentioning
confidence: 99%