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Frequency-domain SQUID multiplexing of transition-edge sensors
By: Lee, A.T.; Holzapfel, W.L.; Hsiao-Mei Cho; Dobbs, M.A.; Clarke, J.; Lueker, M.; Lanting, T.M.; Spieler, H.G.; Smith, A.D.; Richards, P.L.;
2005 / IEEE
This item was taken from the IEEE Periodical ' Frequency-domain SQUID multiplexing of transition-edge sensors ' We describe our frequency-domain readout multiplexer for transition-edge sensor (TES) bolometers and present measurements of an eight-channel multiplexer. Each sensor is biased with a sinusoidal bias at a distinct frequency. As the sensor absorbs power, it amplitude-modulates its sinusoidal bias. Sensor currents are summed and measured with a single superconducting quantum interference device (SQUID) array. The SQUID array consists of 100 dc-SQUID's in series and is operated with shunt feedback electronics which have a slew rate of 1.210/sup 7/ /spl Phi//sub 0//s. A tuned filter consisting of an inductor and capacitor are placed in series with each sensor to both limit the bandwidth of the Nyquist noise from each sensor and to allow us to bias all multiplexed sensors with a common wire. We place an upper limit on crosstalk between adjacent channels of 0.004, well below our design requirements. Demodulated noise spectra from multiplexed sensors show the expected white noise levels at frequencies above 200 mHz.
Demodulated Noise Spectra
Frequency-domain Readout Multiplexer
Transition-edge Sensor Bolometers
Single Superconducting Quantum Interference Device Array
Shunt Feedback Electronics
Superconducting Device Noise
Sensor Phenomena And Characterization
Electric Sensing Devices
Transition Radiation Detectors
Engineered Materials, Dielectrics And Plasmas
Fields, Waves And Electromagnetics
Frequency-domain Squid Multiplexing