The ColdFeedback web of TWiki. TWiki is a Web-Based Collaboration Platform for the Enterprise. http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback Copyright 2020 Winterland Cosmology Lab, McGill University, Montréal, Québec, Canada 2016-06-13T22:22:46Z http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/WebHome 2016-06-13T22:22:46Z

This Cold Feedback web contains a collection of studies/projects on feedback on or due to cryogenic circuits. For example, the DAN and DAF projects use the DfMUX board ... (last changed by TijmenDeHaan)

TijmenDeHaan http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/WebTopicCreator 2016-01-26T18:54:58Z

(last changed by JoshuaMontgomery)

JoshuaMontgomery http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/SineMixer 2014-02-17T19:55:49Z

Sine Wave Mixer The transfer function of a sine wave mixer acting on broadband white noise is 1/sqrt(2). There is a factor of sqrt(2) from adding the left and right ... (last changed by TijmenDeHaan)

TijmenDeHaan http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/IntroToDan 2012-06-08T19:20:41Z

Intro To DAN WARNING This page is out of date and essentially useless as of 8Jun2012. Where To Start Install DAN Firmware Installing the firmware means starting ... (last changed by TijmenDeHaan)

TijmenDeHaan http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/TestingDafFirmware 2011-11-17T00:44:28Z

Testing DAF Firmware Motivation The Digital Active Feedback (DAF) firmware is work in progress, mainly involving Adam, Graeme and Tijmen. The initial attempt at making ... (last changed by TijmenDeHaan)

TijmenDeHaan http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/StrongElectrothermalFeedback 2011-11-17T00:44:27Z

Strong Electrothermal Feedback Introduction I am trying to simulate a bolometer using Simulink (an addon to MATLAB). I start from equation (3.6) in Trevor's thesis ... (last changed by TijmenDeHaan)

TijmenDeHaan http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/GainContraints 2011-11-17T00:44:19Z

Gain Contraints For gain/impedance alone can consider the equivalent circuit for the tranformer of a capacitor, inductor and resistor in parallel. The resistance of ... (last changed by TijmenDeHaan)

TijmenDeHaan http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/StrongElectrothermalFeedback2 2011-09-28T03:09:09Z

Active Feedback The following diagram shows the simplest possible reduction of the reading out of one bolometer. By approximation, we can group all the impedances ... (last changed by MattDobbs)

MattDobbs http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/DanInstability 2011-07-15T20:28:16Z

DAN Oscillations Introduction This document is out of date. When a discrete time integrator is added to the feedback loop, stability is greatly improved. In order ... (last changed by TijmenDeHaan)

TijmenDeHaan http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/LCboardProjectFiles 2011-06-27T16:42:03Z

This page has the LC board design files May 2011 Altium files LCboard temp forAdam check 31May11.zip: LCboard temp forAdam check 31May11.zip Gerbers and fabrication ... (last changed by WinterlandUser)

WinterlandUser http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/SpiralInductors 2011-06-22T15:08:34Z

WinterlandUser 2011 05 13 This is the page that considers replacing the inductors on the LC board with spiral inductors Design goals We like to replace the 16uH ... (last changed by WinterlandUser)

WinterlandUser http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/DanBodePlots 2011-06-15T20:30:30Z

DAN Bode Plots Motivation Since DAN is an integral control loop, its transfer function can be written down analytically. DAN is linear, so the Bode plot contains ... (last changed by TijmenDeHaan)

TijmenDeHaan http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/LoopGainEquations 2011-06-13T18:37:27Z

Loop Gain Equations Motivation For voltage biased TES bolometers, knowing the steepness of the transition is very important. The most natural parametrization of that ... (last changed by TijmenDeHaan)

TijmenDeHaan http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/SonOfDAN 2011-04-20T18:23:37Z

DAN Rework Motivation Matt noticed that DAN (in contrast to old style nulling) requires handling both the large "carrier" current through the bolometer and the small ... (last changed by GraemeSmecher)

GraemeSmecher http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/NewCICWorkbook 2010-12-03T21:47:20Z

(last changed by GraemeSmecher)

GraemeSmecher http://www.mcgillcosmology.com/twiki/bin/view/ColdFeedback/DigitalActiveFeedbackImplementation 2010-12-02T15:17:24Z

Implementation The main purpose of this page is to plan the path forward (outline TODO items) on implementing digital active feedback (DAF). Firmware Tijmen wrote ... (last changed by TijmenDeHaan)

TijmenDeHaan

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This topic: ColdFeedback > WebAtom Topic revision: r1 - 2006-01-24 - TWikiContributor

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