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Microstrip superconducting quantum interference device amplifier: Conditional stability
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10.1063/1.3377898
/content/aip/journal/apl/96/17/10.1063/1.3377898
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/17/10.1063/1.3377898
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Experimental configuration to measure and of the MSA at 4.2 K. The signal generator is incorporated into the VNA. The cold 3 dB attenuator reduces the power rereflected at the output of the MSA. is current bias, produces flux bias. and are found by reversing the MSA input and output.

Image of FIG. 2.
FIG. 2.

(a) Schematic of a general two-port device (MSA) connected to a source with impedance and load with impedance via transmission lines of negligible length and characteristic impedance . (b) Equivalent signal flow graph of the circuit in (a) for determining and .

Image of FIG. 3.
FIG. 3.

-parameters for the MSA with the washer grounded and biased for maximum gain. (a) and shown on the Smith Chart. The frequency increases from 300 to 700 MHz following the directions indicated by the arrows, the circles show the resonant frequency of 490.5 MHz. (b) and (c) Real and imaginary parts of and vs frequency.

Image of FIG. 4.
FIG. 4.

The load (light gray) and source (dark gray) stability circles for the MSA with the washer grounded. (a) with flux and current biases adjusted for maximum gain which occurs at 490.5 MHz (as in Fig. 3). (b) with flux and current biases adjusted for maximum gain which occurs at 491.5 MHz. In [(a) and (b)] both circles enclose the origin, and so that the stable region in both cases is inside the limit circle.

Image of FIG. 5.
FIG. 5.

-parameters for the MSA with the counterelectrode grounded and biased for maximum gain. (a) and shown on the Smith Chart. The frequency increases from 300 to 700 MHz following the directions indicated by the arrows, the circles show the resonant frequency of 477 MHz. [(b) and (c)] Real and imaginary components of and vs frequency.

Image of FIG. 6.
FIG. 6.

The load (light gray) and source (dark gray) stability circles for the MSA with the counterelectrode grounded. (a) with flux and current biases adjusted for maximum gain which occurs at 477.0 MHz. Neither circle encloses the origin, but and so that in both cases the stable region is inside the limit circle. (b) with flux and current biases adjusted for maximum gain which occurs at 559.0 MHz. The load stability circle encloses the origin, , and the stable region is inside the limit circle. The source stability circle does not enclose the origin, , and the stable region is outside the limit circle.

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/content/aip/journal/apl/96/17/10.1063/1.3377898
2010-04-26
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microstrip superconducting quantum interference device amplifier: Conditional stability
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/17/10.1063/1.3377898
10.1063/1.3377898
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