dB across the digitizer input bandwidth. Since the ALMA digitizer will have a higher number of bits it may be possible to go to 3 dB across the band. Download a postscript version of ALMA Memo 407. http://www.alma.nrao.edu/memos/html-memos/alma407/memo407.ps View a pdf version of ALMA Memo 407. http://www.alma.nrao.edu/memos/html-memos/alma407/memo407.pdf