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Application Notes
Preamplifiers
A preamplifier is an amplifier used in a way such that it usually precedes another amplifier to prepare an electronic signal for further amplification or processing.
It is usually a low noise amplifier with moderate gain. For example, in communications systems, the preamplifier is used to amplify the very small signals received by the antenna and is often located very close to the antenna.
Using a preamplifier with low noise, the noise of all the subsequent stages is reduced by the gain of the preamplifier and the noise of the preamplifier is injected directly into the received signal. A preamplifier is required to boost the desired signal power while adding as little noise and distortion as possible so that the retrieval of this signal is possible in the later stages in the system.
The following sections will give a description of noise and the effect an amplifier has on the sensitivity and noise figure of a system as well as a method for choosing the correct amplifier to meet your measurement needs.
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