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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.