<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">carrier amplifiers</topic></authority><related type="broader"><topic>amplifiers</topic></related><variant type="other"><topic>carrier amplifier</topic></variant> <note xml:lang="en"><![CDATA[ Direct-current amplifiers in which the signal is passed through a low-pass filter, then used to modulate a carrier signal so it may be amplified as an alternating-current signal. The amplified DC output is obtained by rectifying and filtering the carrier signal. ]]></note></mads>