An analysis of YBa1Cu3O7-delta bicrystal dc-SQUIDs is reported. The de
vices have been fabricated by de cylindrical magnetron sputtering from
a single target. SQUIDs operating at the liquid nitrogen temperature
have been obtained employing high-quality films fabricated insitu exhi
biting a critical temperature as high as 89-90 K. Two different geomet
rical configurations for the loop inductance have been investigated. A
good control of the transport parameters of the junctions, together w
ith a reasonable correlation between the calculated inductance and the
voltage response to an applied magnetic field, have been achieved. A
study of the voltage response vs. the applied magnetic field as a func
tion of both temperature and bias current has been carried out. SQUIDs
working at temperatures as high as 87 K have been characterized.