Charges Sensing Preamplifier & noise instrumentation examples1 A little example of noise measurement in time domain and frequency domain I acquired noise.

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Presentation transcript:

Charges Sensing Preamplifier & noise instrumentation examples1 A little example of noise measurement in time domain and frequency domain I acquired noise after a CSP (sampling 10ns) :  = 0.170mV RMS

Charges Sensing Preamplifier & noise instrumentation examples2 We know that Cf=2pF (It’s written on the preamp!) We know a charge pulse gives a “step” response whose amplitude is We measured Vrms = 0.160mV  the Equivalent Noise Charge (ENC) is 0.34fC = 2100 charges = 7.6keV in Silicon detectors We will do far better later…

Charges Sensing Preamplifier & noise instrumentation examples3 For the moment let’s look at the specifications of our system: Detector : CSP : Polarization : Feedback :

Charges Sensing Preamplifier & noise instrumentation examples4 The noise spectral density is : v.noise <- ts(v.csp, start=0, frequency=1/(0.01e-6)) S <- spectrum(v.noise, spans=c(5,5)) plot (c(100,1e8), c(1e-9,1e-5), type="n", log="xy", xlab="frequency (Hz)", ylab="spectral density (V/Hz^1/2)") grid() lines(S$freq, sqrt(2*S$spec))

Charges Sensing Preamplifier & noise instrumentation examples5 The noise spectral density is :

Charges Sensing Preamplifier & noise instrumentation examples6 Let’s compare it to CSP theory :

Charges Sensing Preamplifier & noise instrumentation examples7 And, obviously : That’s all folks! Noise can be measured in time domain But the full description is easier in frequency domain We are able to select components in order to make less Noise than the detector itself. (except the noise voltage of the preamp.)