When the transistor switches “ON” it sinks the output current through the Collector resulting in an inevitable voltage drop across the Emitter resistance thereby limiting the negative output capability. It uses a single-ended transistor for its output stage with the resistive load connected directly to the Collector terminal. This is the simplest type of Class A power amplifier circuit. Consider the Class A amplifier circuit below. Class A power amplifier output stages may use a single power transistor or pairs of transistors connected together to share the high load current. This means then that the Class A Amplifier configuration is the ideal operating mode, because there can be no crossover or switch-off distortion to the output waveform even during the negative half of the cycle. The transistor is always biased “ON” so that it conducts during one complete cycle of the input signal waveform producing minimum distortion and maximum amplitude of the output signal. The Class A amplifier is the simplest form of power amplifier that uses a single switching transistor in the standard common emitter circuit configuration as seen previously to produce an inverted output. The most commonly used type of power amplifier configuration is the Class A Amplifier. Pdc – is the DC power taken from the supply.įor a power amplifier it is very important that the amplifiers power supply is well designed to provide the maximum available continuous power to the output signal. ![]()
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