Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1949-09

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                                        JOURNAL
                                        TECHNICAL INFORMATION FROM THE HEWLETT-PACKARD LABORATORIES
                                                                                                                                                      VOL. 1 No. 1

SHED ALTO, SEPTEMBER, HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA SEPTEMBER, 1949




                               A New Amplifier For
                              Milli- Microsecond Pulses
   RECENT developments in nuclear radia                                   selves for amplifying signals anywhere in
         tion measurements have created a need                            the range from audio frequencies to 200
   for amplifiers having extremely wide band                              megacycles. The amplifier can readily be
   width or speed compared to conventional                                used for extending by tenfold the sensitivity
   video amplifiers. For example, certain photo-                          of a peak-reading diode voltmeter or for
   multiplier type radiation detectors have out                           amplifying the output of a low-level signal
   put pulses as short as 0.01 microsecond.                               generator.
      The new Model 460A amplifier shown in                                  The distributed amplifier1 circuit provides
   Figure 1 will amplify such pulses with very                            a means for connecting conventional ampli
   little distortion and provide suitable output                          fier tubes in parallel so that their plate cur
   for operating sealers, coincidence devices,                            rents add but their capacities do not. Thus,
   or for direct viewing on a cathode ray tube.                           the bandwidth can be increased beyond the
   Although this amplifier was developed pri                              point where the individual tubes have a gain
   marily to meet these requirements, other                               of one, which is the limiting point in con
   more general applications suggest them                                 ventional cascaded stages.




                                               Figure 1. Model 460 A Wide Band Amplifier

    P R I N T E D   I N   U . S . A .                                                              C O P Y R I G H T   1 9 4 9   H E W L E T T - P A C K A R D   C O .

                                                                                            'Ginzton, Hewlett, et al, "Distributed Amplifica
                                                                                              tion," Proc. I.R.E., Vol. 36, pp. 956-969;
                                                                                              August, 1948.
                                                        

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