Abstract
We report on the noise properties of serial SQUID arrays (SSAs). We have developed current amplifiers using SSAs for transition edge sensor microcalorimeters with high current resolution and large dynamic range. Some SSAs changing the number of DC-SQUIDs were fabricated. Distortions on the Φ– V curves did not occur for all SSAs. Current resolution better than 10 pA/√ Hz was obtained by SSA amplifiers composed of 200 DC-SQUIDs or more. For SSAs composed of DC-SQUIDs having same device parameters, the current resolution is improved as the number of the DC-SQUIDs is increased. However, it is limited by a certain number, which does not only depend on the voltage noise of RT electronics but also on the noise generated in SSA itself.
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