The aim of the reported work is to explore the
viability of a correlator for a future large-scale interferometer,
with hundreds of receivers, by developing a pathfinder in which
the 30 GHz receivers of QUIJOTE experiment will be reused.
Nowadays, there are some interferometric experiments designed
to study the Cosmic Microwave Background (CMB). Although
the sensitivity of the instruments is proportional to the number
of receivers, interferometers normally present a reduced
number of them due to the difficulty to correlate a large
number of wide-band signals. For this reason, thinking about a
Michelson-type interferometer, two types of single base-line
correlators are proposed in order to compare them and to
analyse their viability. The first choice is an analog correlator
designed on FR4 substrate with a 10 kHz video bandwidth. The
maximum frequency of the correlator input signals should not
exceed 300MHz. On the other hand, a digital version has been
implemented using a PCI card from Agilent Technologies with a
maximum digitalization rate of 1GS/s on each of its two inputs
