Abstract
We have analyzed the biasing of the first-stage dc superconducting quantum interference devices (SQUIDs) of a time-domain dc-SQUID multiplexer (SQUID MUX) and find that the bias conditions of first-stage SQUIDs significantly affect the performance of the SQUID MUX in terms of total multiplexer noise and bandwidth. We present an experimental study of the operational parameters of a first-stage SQUID under varied bias conditions. Our measurements include a direct determination of the first-stage SQUID dynamic resistance RDYN1 and the flux noise of the first-stage SQUID biased over the range from voltage bias to current bias. Our measurements show that matching the bias resistors RS1 of the first-stage SQUIDs to RDYN1 improves the SQUID MUX noise performance as well as the first-stage bandwidth.
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