Lecture 11

Lecture 11 - HTS Probes Signal Processing and Control SNR...

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EE 597E Spring 2007 Lecture 11 HTS Probes HTS Probes Signal Processing and Control – SNR and probe bandwidth – Signal Processing: Modeling and Analysis – Feedback optimized detection
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EE 597E Spring 2007 Lecture 11 Fundamental Requirement: Fundamental Requirement: Sanity Check for using HTS Probes Sanity Check for using HTS Probes The sample losses R s must be smaller than normal-metal probe losses R p () La v g ta t QN SNR TT R + {} 2 Re op L in ps L Q Z RR a ω = ++
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EE 597E Spring 2007 Lecture 11 High Probe Q High Probe Q - - Factor Advantages Factor Advantages The increase in SNR predicted by results from rejecting thermal noise Reducing probe bandwidth also rejects RFI sources, such as AM broadcast interface, in explosive detection systems () 3dB ; La v g o L ta t QN SNR Q TT R ω β ∝= +
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EE 597E Spring 2007 Lecture 11 Signal Gain and Probe Bandwidth Signal Gain and Probe Bandwidth At the tuned frequency, a resonator provides a gain proportional to the Q-factor – As both signal and noise within the probe pass band experience the same gain, an HTS probe does not provide SNR improvement through enhancement of signal strength What happens when the MR signal bandwidth is greater than the probe bandwidth β 3 dB ?
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EE 597E Spring 2007 Lecture 11 Signal at Preamp Input Signal at Preamp Input Signal Spectra () Mj ω Probe Response Hj PreampInput Signal ()() Rj Mj Hj ωω =
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EE 597E Spring 2007 Lecture 11 Compare the Spectral Bandwidth Compare the Spectral Bandwidth
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EE 597E Spring 2007 Lecture 11 Spectra at Receiver Input Spectra at Receiver Input
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EE 597E Spring 2007 Lecture 11 When Signal Bandwidth When Signal Bandwidth Exceeds Probe Bandwidth Exceeds Probe Bandwidth Smaller signal amplitude |R(j ω )| reduces SNR Smaller probe bandwidth rejects signal information
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Lecture 11 - HTS Probes Signal Processing and Control SNR...

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