Agilent 1949-09 free download

File name 1949-09.pdf

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.