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Multistage amplifier
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<p>A multistage amplifier is an electronic amplifier consisting of two or more single-stage <a href="/facts/Amplifier/pnRgxncC">amplifiers</a> connected together. In this context, a single stage is an amplifier containing only a single <a href="/facts/Transistor/Bmr8zwL0">transistor</a> (sometimes a pair of transistors) or other active device. The most common reason for using multiple stages is to increase the <a href="/facts/Gain_(electronics)/CWbehg27">gain</a> of the amplifier in applications where the input signal is very small, for instance in <a href="/facts/Radio_receiver/5olDTxkg">radio receivers</a>. In these applications a single stage has insufficient gain by itself. In some designs it is possible to obtain more desirable values of other parameters such as <a href="/facts/Input_resistance/AQCLaTj9">input resistance</a> and <a href="/facts/Output_resistance/80brK3Cv">output resistance</a>. </p>