Difficulties encountered with the amplification of analog signals can
often be traced to the interface between the signal source and the
amplifier system, especially if insufficient effort has been devoted to
this connection.
Consider some of the problems:
The source output impedance may be incompatible with the amplifier
input impedance.
The sensitivity of the amplifier may be too low to match the signal
of interest.
There is some distance between the source and the amplifier
resulting in long cable runs which cause either degradation of the
signal itself or degradation of the signal to noise ratio through
pick-up.
In these cases and many others the use of an appropriate preamplifier
can alleviate the problems and yield significant improvements in signal
measurement capabilities.
For example:
Input impedances can be matched to the source to achieve the most
appropriate loading.
Differential input preamplifiers have the ability to reject pick-up
noise, offer a high degree of isolation to floating sources and avoid
ground loops.
Conditioning filters within a preamplifier can restrict the
bandwidth of the signal path allowing gain to be applied only to the
frequencies of interest thus improving signal to noise ratios.
A preamplifier allows the user to apply signal gain at the most
appropriate point in a system, for example close to the source if long
cable runs are necessary.
SIGNAL RECOVERY
is part of Advanced Measurement Technology, Inc, a division of AMETEK,
Inc.
It includes the businesses formerly trading as EG&G Instruments
(Signal Recovery),
EG&G Signal Recovery and PerkinElmer Instruments (Signal Recovery)
is
a trademark of AMETEK, Inc.