Moulded microwave squid for r.f.-attenuator calibration

Petley, B. W.; Morris, Kristen; Yell, R.W.; Clarke, R.N.

doi:10.1049/el:19760182

Cited by 12 publications

(4 citation statements)

References 1 publication

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“….. and noting that the requirements of a < 1 and f3 < 1 requires /32 < 1 (although /31 may still be of the order of unity), we find from eqs (4) and (5) that (6) This establishes the approximate sinusoidal behavior of the threshold characteristic of a sufficiently asymmetric dc SQUID with low inductance.…”

Section: Introductionsupporting

confidence: 54%

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Sinusoidal response of dc SQUIDs for rf power measurements

Peterson¹

1987

J. RES. NATL. BUR. STAN.

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Current, power, and attenuation measurements with rf SQUIDs are based on the fact that the voltage from the microwave readout circuit can be made a nearly sinusoidal function of the magnetic flux threading the SQUID. We point out here that an asymmetric dc SQUID with sufficiently low inductance can achieve a very sinusoidal output voltage with good modulation depth. The spectral purity of the sinusoid can be substantially better than that obtained with rf SQUID systems. The purity improves with increasing asymmetry of the junction critical currents, and decreasing values of the LIe product, where L is the SQUID inductance and Ie is the smaller of the critical currents. Results of several calculations are presented. Substantial improvement in SQUID methods of rf current, power, or attenuation measurement may thus be possible with use of such dc SQUIDs.

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Section: Introductionsupporting

confidence: 54%

“…The periodic response to an impressed flux is, however, not ideally sinusoidal, and this necessitates an elaborate series of corrective procedures [2][3][4][5][6][7]. The purpose of this note is to point out that a dc SQUID (a superconducting loop containing two Josephson junctions-see fig.…”

Section: Introductionmentioning

confidence: 99%

Sinusoidal response of dc SQUIDs for rf power measurements

Peterson¹

1987

J. RES. NATL. BUR. STAN.

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“…Several decades ago, NMIs used such methods to calibrate rf attenuators [100][101][102][103]. The microwave-pumped SQUID typically consisted of an adjustable point contact mounted in a superconducting waveguide close to its short-circuited end at a distance of a quarter of a wavelength 14) .…”

Section: Radio-frequency Attenuation With Squidsmentioning

confidence: 99%

“…This effect becomes significant at high frequencies [102]. Moreover the routine of attenuation measurement was compromised by unreliability of the junction.…”

Section: Radio-frequency Attenuation With Squidsmentioning

confidence: 99%