... The nature of 160 IRAS sources has been investigated through a search for water maser emission at 22.2 GHz. ... Out of the whole sample 11 water masers have been detected, 2 for the first time. ... Wood & Churchwell (1989) (hereafter WC) have proposed criteria to identify UC HII regions based on FIR flux density distribution (and hence the colours) of sources extracted from the IRAS Point Source Catalogue ( IRAS (1985) ). ... The detection rate for the NRA sample is 24% (10 detections out 42 sources...

... 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). ...