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Common-Emitter Amplifier PowerPoint Presentation

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Slide 1 - Practical Amplifier To analyse the circuit: Determine quiescent conditions Calculate mutual conductance Calculate small signal performance Voltage Gain Input Impedance Output Impedance Cut-off frequency
Slide 2 - Quiescent Conditions
Slide 3 - Small Signal Analysis: Voltage Gain As before:
Slide 4 - Input and Output Impedance Unlike the op-amp, transistor amplifiers have significant output impedances and finite input impedances RIN can be comparable with the source resistance of the input signal ROUT can be comparable with the load resistance
Slide 5 - Input Impedance iIN iB iRB Input impedance, rIN, is the ratio of the small signal input voltage and the small signal input current
Slide 6 - Input Impedance (cont) iIN iB iRB
Slide 7 - Output Impedance One way to measure rOUT is: Short the input to 0 V Output now looks like just rOUT
Slide 8 - Output Impedance (cont) Applying Kirchoff’s current law: By Ohm’s law:
Slide 9 - Coupling Capacitors Capacitor COUT is needed to remove the d.c. component of the collector voltage Capacitor CIN is needed to allow the base voltage to be offset from 0V In both cases this is known as coupling Both capacitors are chosen to look like short circuits at operating frequencies Their reactance will, however, become significant at low frequencies
Slide 10 - Equivalent Circuit
Slide 11 - Cut-Off Frequency Cut-off frequency, or –3dB point, is when the gain of the amplifier falls by a factor of Ö2 If the cut-off frequency, fC, is specified and rIN has been calculated: NB. This assumes that COUT still looks like a short circuit
Slide 12 - COUT For the lower cut-off frequency calculation to be valid, COUT should still look like a short circuit at fC Typically, choose:
Slide 13 - Emitter Capacitor vIN vBE vE For the highest voltage gain, But, where, Also,
Slide 14 - Emitter Capacitor (cont) vIN vBR vE For CE to not interfere at fC: Where, To make sure, choose, NB. Use rE (=VT/IC) not RE for this calculation!
Slide 15 - Summary In the context of the common-emitter amplifier we have covered: Small signal analysis Mutual conductance Input/output impedance Coupling capacitor requirements and cut-off frequencies Next time: Applying the same principles to the differential amplifier It’s actually a much easier circuit to analyse – honest! Make sure you’re happy with the fundamentals by then!
 

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