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DIGITAL FEEDBACK LOOPS FOR DIRECT CURRENT SQUIDS.

Author(s) : DRUNG D.

Type of article: Article

Summary

DIGITAL FEEDBACK LOOPS FOR DIRECT CURRENT SQUIDS USING PULSE-RATE MODULATION ARE PROPOSED AND INVESTIGATED BY SIMULATIONS AND MEASUREMENTS. THE DESIGN OF A DIRECT CURRENT SQUID MAGNETOMETER YIELDS A SIMULATED ENERGY RESOLUTION OF ABOUT 11 H (H = PLANCK'S CONSTANT) WHERE ABOUT 3 H CORRESPONDS TO ADDITIONAL NOISE DUE TO THE FEEDBACK LOOP. MEASUREMENTS AT JOSEPHSON SAMPLER PROTOTYPE CHIPS SHOWED THAT THE DIGITAL FEEDBACK LOOP IS VERY STABLE AND FAST ENOUGH TO OBTAIN A FLICKER-FREE DISPLAY ON AN OSCILLOSCOPE. AN INTEGRATION OF SENSOR AND FEEDBACK LOOP ON ONE OR SEVERAL CHIPS WITH JOSEPHSON JUNCTIONS SEEMS FEASIBLE.

Details

  • Original title: DIGITAL FEEDBACK LOOPS FOR DIRECT CURRENT SQUIDS.
  • Record ID : 1987-1255
  • Languages: English
  • Source: Cryogenics - vol. 26 - n. 11
  • Publication date: 1986

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