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HEWLETT-PACKARD
JOURNAL
T E C H N I C A L I N F O R M A T I O N F R O M T H E - d p - L A B O R A T O R I E S
Vol. 14, No. 3-4
UBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA NOV.-DEC, 1962
A Solid -State Operational Amplifier
of High Stability
AMPLIFIERS play a role of great A new dc amplifier has been designed which
importance in instrumentation where achieves greater reliability and accuracy than
they permit observation of low-level potentials previously available in a solid state device of
not only from regular electrical sources but this type. A maximum drift level of 1 micro
from mechanical, chemical and biological volt per week at constant temperature and a
sources as well. In analog computer work these temperature coefficient of but one-half micro
amplifiers are used to sim
SEE ALSO:
volt per °C with a 100 kilohm summing point
ulate mathematical opera
Telephone impedance constitute an order of magnitude
tions such as integration
Test Set, p. ? improvement over previous all-solid-state dc
and summing. They are
also invaluable for increasing the sensitivity of amplifiers. The amplifier is designed with
voltmeters and recorders, or isolating them plug-in modules that permit a wide variety of
from the signal source. For all of these appli applications. It has a gain stability of ±.01%
cations, though, the amplifier must have a per week, is extremely reliable, and is unaf
high degree of gain stability and very low in fected by mounting position or external vibra
trinsic voltage- or current-offset to permit the tion, as no mechanical choppers or vacuum
accurate observation of the desired signal. tubes are used.
PLUG-IN UNIT
ROUT?10Jl
Fig. left) New solid-stale dc amplifiers (group of fife in case at left) Fig. 2. Basic circuit arrangement of
have high stability, low drift, fast recovery on large overloads, and new amplifier. Feedback impedances
use panel plug-in modules to adapt to many uses. Unit is produced by are in plug-ins to permit a variety of
-hp-'s Dymec division. uses for amplifier.
P R I N T E D I N U . S . A . C O P Y R I G H T 1 9 6 2 H E W L E T T - P A C K A R D C O .