Место издания:Institute of Phsics Publishing, Bristol and Philadelphia UK
Первая страница:727
Последняя страница:730
Аннотация:We present 2 versions of a 2-stage all-Nb de SQUID amplifier with different designs of the first SQUID loop. The amplifiers have large (3 mu H and 4.8 mu H) input inductances matched with the inductances of the first stage SQUIDs by 2 transformers. Effective coupling factors k(2) (0.04 and 0.17) and intrinsic energy resolutions (22 h and 80 h) have been measured. An advanced fully integrated version of the SQUID amplifier is also discussed.