2-STAGE SERIES ARRAY SQUID AMPLIFIER FOR SPACE APPLICATIONS

We present test results for a two-stage integrated SQUID amplifier whi ch uses a series array of d.c. SQUIDS to amplify the signal from a sin gle input SQUID. The device was developed by Welty and Martinis at NIS T and recent versions have been manufactured by HYPRES, Inc. Shielding and filtering techniques were employed during the testing to minimize the external noise. Energy resolution of 300 h was demonstrated using a d.c. excitation at frequencies above 1 kHz, and better than 500 h r esolution was typical down to 300 Hz. (C) 1996 Elsevier Science Limite d