---+!! Welcome to the ColdFeedback web
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 to actively feed back on the SQUID coil and bolometer respectively. Another section "electrothermal feedback" explores the feedback due to the bolometer itself.
This topic: ColdFeedback > WebHome Topic revision: r65 - 2016-06-13 - TijmenDeHaan
LISA
* We are currently writing a summary paper describing the performance of the LISA (linearized SQUID array). Drafts will be posted to this web. There is also a CVS archive containing the paper and figures on kong.physics.berkeley.edu under papers/MUX_2005_LISA * LISA_firstdraft.pdf: LISA_firstdraft.pdfDigital Active Feedback
- StrongElectrothermalFeedback - Simulation of a TES bolometer under strong electothermal feedback (Tijmen).
- StrongElectrothermalFeedback2 - The equations for active feedback.
- Digital_Active_Feedback_v1.6.pdf - A document summarising my work on Digital Active Feedback as of 7Aug09.
- DigitalActiveFeedbackImplementation - The path forward to implementing digital active feedback.
- TestingDafFirmware - A scheme for testing the DAF firmware outside of the cryostat.
- dafwarm_v1.1.pdf - Summary of warm testing of DAF.
- dafcold_v1.1.pdf - Proposal for cold testing of DAF.
Digital Active Nulling
- Matt's proposal is here.
- Tijmen's notes on the instability at moderate loop gain are here.
- DanBitWidths - Summary of various bit widths in DAN firmware.
- DanDiscretizationNoise - Noise induced by the finite number of bits in the accumulator.
- DanBodePlots - Bode plots for DAN
- DanOverlappingChannels - Investigation of the effect of DAN channels that overlap in frequency space.
- SonOfDAN - Plan for the next DAN strategy.
- IntroToDan - A brief introduction to setting up and running DAN.
- DanTransferFunction - The effective transfer function of DAN as a function of frequency.
- DanWhiteNoise - An investigating of the effect of DAN on white noise.
- NewCICWorkbook - Workbook for new 128-channel, pipelined CIC design
- DANFirmwareReleases - Main page for DAN Fimware releases.
- DANFirmwareInstructions - How to program a flashcard for the new DAN builds.
- DanToDo - An active "to do" list for DAN development.
- DanWarmNoise - No noise increase for DAN on various (resistive) dongles.
Electrothermal Feedback
- noise_reduction_v1.1 A calculation of the effects of electrothermal feedback on a "helper" signal as well as Johnson noise.
- LoopGainEquations - Some information on the loop gain of electrothermal feedback.
- current_bias_responsivity_v1.0 A small-signal analysis of the effect of some current bias of a bolometer.
- jnoise_suppression_v1.3.pdf Tijmen's latest Johnson noise suppression calculation.
- series_impedance_responsivity_v1.2.pdf Small signal analysis of "excess responsivity" due to series impedance
- SineMixer - A quick note explaining the transfer function of a sine wave mixer.
- bolometer_thevenin_equivalent_circuit.pdf Why the series impedance the bolometer sees is different from what we measure with a superconducting network analysis
Cold transformer
- ColdTransformerOpampTesting - Noise performance of ADA4817-1ARDZ in Lisa Squid board (channels 1 + 9)
- ColdTransformerOpampSpecifications - Specifications for squidless bolo readout system and implications of these specifications
- AmplifierNoiseAmplification
- AmplifierPapers
- WindingCapacitancePapers
- RboloOptimum
- Matt's Cold Transformer Design Notes
LC Board
ColdFeedback Web Utilities
This topic: ColdFeedback > WebHome Topic revision: r65 - 2016-06-13 - TijmenDeHaan
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