The transistor amplifier is non-linear and an incorrect bias setting will produce large amounts of distortion to the output waveform.This DC Base biasing means that the amplifier consumes power even if there is no input signal present.DC Bias sets the Q-point of the amplifier half way along the load line.In order to amplify all of the input signal distortion free in a Class A type amplifier, DC Base Biasing is required.The power Gain of the amplifier can also be expressed in Decibels or simply dB.Gain is a ratio of output divided by input, therefore it has no units but is given the symbol (A) with the most common types of transistor gain being, Voltage Gain (Av), Current Gain (Ai) and Power Gain (Ap).The Gain of a small signal amplifier is the amount by which the amplifier “Amplifies” the input signal.Voltage Amplifiers have 3 main properties, Input Resistance, Output Resistance and Gain.Small Signal Amplifiers are also known as Voltage Amplifiers.Typical Single Stage Amplifier CircuitĪmplifiers Summary of Small Signal Amplifiers In this amplifiers summary section we looked at the amplifier circuit based on a single bipolar transistor as shown below, but there are several different kinds of transistor amplifier circuits that we could use. Generally we think of Amplifiers as audio amplifiers in the radios, CD players and stereo’s we use around the home.
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