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AMPLIFIER COMPONENTS VCC the DC voltage that powers the amplifier sets the DC operating provides the energy for the output AC signal RB1 RB2 DC bias potential divider to set the ‘Q’ point in conjunction with VCC RE emitter resistor to provide, due to the negative feedback effect, a stable ‘Q’ point if component values change with age or temperature, transistor is replaced or transistor parameters change due to age or temperature. if unbypassed by a capacitor will reduce the ac voltage gain !!!! CC1 ensures generator does not affect the bias (Q point of transistor Q1) input transistor DC voltage does not affect the generator CC2 ensures stage 1 and stage 2 bias remains the same when the 2 stages are interconnected CC3 ensures the load does not affect transistor Q2 bias to provide only ac output to the load CE to avoid stage 1 negative feedback due to RE reducing the voltage gain VGEN represents the input signal voltage source (signal generator, microphone etc.) RGen represents the input source internal impedance / resistance RL represents the amplifier load ( resistor, loudspeaker, input resistance of a cascaded stage etc.) NOTE: VGEN NOT required in the analysis of amplifier voltage gain but required if actual voltages are needed RGen NOT required in the analysis of amplifier voltage gain but required if actual voltages are needed RGEN forms a potential divider with Rinput of amplifier RL EMT112: Amplifier voltage gain is RL dependent ANALOG 1 AMPLIFIER COMPONENTS 1 Prof R T KENNEDY 2004