A water maser search towards colour­selected IRAS point sources By C l a ud i o C o d e l l ay AND F r a n c e s c o Pa l l az e­mail: codella@arcetri.astro.it y Dipartimento di Astronomia e Scienza dello Spazio, Universit`a degli Studi di Firenze, Largo E. Fermi 5, I--50125, Firenze, ITALY z Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I--50125, Firenze, ITALY The nature of 160 IRAS sources has been investigated through a search for water maser emission at 22.2 GHz. ... 100 Jy. ...

... The design employs a differential structure. ... The input is adapted to 100 differential, and the outputs use standard Low Voltage Differential Signaling (LVDS). ... T/H SINGLE T/H Single Input T/H Single Output 1.35 0.15 0.2 T/H DIFFERENTIAL Input T/H Output T/H 0.1 1.3 0.05 volts volts Figure 5: Digital part and digital gate 0 1.25 -0.05 -0.1 1.2 Integrated Test System A test system is integrated on chip to evaluate the transmission to the data acquisition card (fig: 7). ...