High frequency scanning SQUID microscope
ORAL
Abstract
One important application of scanning SQUID microscopes is to fault detection in integrated circuits and multi-chip modules. However, the present generation of computer processors operate at over 1 GHz, well above the bandwidth of the present generation of SQUID microscopes. We present results for a 4.2 K scanning SQUID microscope with a bandwidth in the GHz range. We have overcome the bandwidth limitations of traditional scanning SQUID microscopes by removing the main bandwidth limiter – the conventional flux-locked loop electronics - and using instead a pulsed sampling technique with a hysteretic SQUID. We describe the overall design and operation of our system, and present high-speed measurement results.
*Supported by CSR and LPS
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