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Microstrip superconducting quantum interference device radio-frequency amplifier: Scattering parameters and input coupling
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10.1063/1.2902173
/content/aip/journal/apl/92/17/10.1063/1.2902173
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/17/10.1063/1.2902173
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Experimental configuration to measure and of the MSA at . The signal generator is incorporated in the VNA. The cold attenuator reduces the power that is rereflected at the output of the MSA. is current bias, produces flux bias. (b) Equivalent circuit model of the low-loss transmission line. represents the static capacitance, circuit represents the fundamental resonance.

Image of FIG. 2.
FIG. 2.

Real and imaginary parts of the impedance of the low-loss transmission line model shown in Fig. 1(b) measured at . Solid lines are fit to the measured data converted to impedance (circles).

Image of FIG. 3.
FIG. 3.

Real and imaginary parts of for microstrip terminated with varactor diode set at for . Circles are data, lines are predictions of model. The inset shows measured resonant frequency (circles) vs varactor capacitance along with transmission line prediction.

Image of FIG. 4.
FIG. 4.

Dependence of MSA parameters on flux bias. (a) Resonance frequency (solid) and static SQUID voltage (dashed), (b) microstrip impedance , (c) resistance , (d) capacitance , and inductance .

Image of FIG. 5.
FIG. 5.

Measurements of . (a) Measured real and imaginary parts vs frequency (circles) at ; lines are predictions of equivalent circuit model shown in (b).

Image of FIG. 6.
FIG. 6.

Measured gain vs frequency for a nine-turn MSA for three different input coupling capacitors. With the 0.5, 2.2, and coupling capacitors, the microstrip resonator is, respectively, undercoupled, approximately critically coupled, and overcoupled.

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/content/aip/journal/apl/92/17/10.1063/1.2902173
2008-04-29
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microstrip superconducting quantum interference device radio-frequency amplifier: Scattering parameters and input coupling
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/17/10.1063/1.2902173
10.1063/1.2902173
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