Better System Sensitivity through Preamplifiers

Preamplifiers are ideal for improving the system sensitivity of RF measuring instruments and EMC radiated emission test systems. They are also ideally suited to general purpose laboratory use where low-level RF signal amplification is needed.

Test systems for radiated emissions are fundamentally a cascade circuit consisting of receiving antenna, preamplifier, connecting cable and EMI test receiver, which in some cases is extended by an internal preamplifier. The preamplifier can help by boosting low level signals above the noise floor and improving the sensitivity of your measurement system. Make sure it operates over the frequency range of interest and has enough gain. Some preamplifiers have the added benefit of having a rechargeable battery, allowing you to make measurements when a power source is not available.