Op. amps., quartz resonators, and noise: Load the Driven Circuit Data


		PHYS 381/504: Op. amps., quartz resonators, and noise



	Introduction
	Johnson Noise
	Macroscopic Derivation
	Microscopic Derivation
	Install and Test the Optical Amplifier
	Install the Tuning Fork
	Welcome to LabView
	Tune out the Package Capacitance
	Gather Data
	Load the Driven Circuit Data
	Fit the Driven Circuit Data
	Find Circuit Characteristics from this Fit
	Analyze the Undriven Circuit from Characteristics
	Final Results
	References

	PHYS 381La HOME
	Classes Page

Andrew Pariser, December 2005
modified S.M., January 2006

© 2006 Yale University, New Haven, Connecticut 06520

Data Gathering

Set the file directory

$SetDirectory['H:\Documents and Settings\All Users\Documents\'05-'06\Fall\PHYS381\JohnsonNoise\FinalData'] ;$

Load in the data (in decibals)

$response_dB = ReadList['Driven1Tuned', {Number, Number}] ;$

Pull out only the peak values from this data. Adjust the two numerical parameters here in order to get a good window on the peak at 2¹⁶ Hz.

Here you can observe the (beautifully tuned) resonance peak.

data gathering

Convert the data into volts so we can fit it with a Lorentz curve.

$Peak_V = Table[{Peak_dB[[j, 1]], 10^Peak_dB[[j, 2]]/10}, {j, 1, Length[Peak_dB]}] ;$

You can observe the plot of the noise power spectrum in voltage by uncommenting this line.

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