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Lecture 12_ Feb 14 2011

Lecture 12_ Feb 14 2011 - Common – Emitter Amplifier(DC...

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Chapter 13 Small-Signal Modeling and Linear Amplification Lecture 12 Covered Sections: 13.2, 13.6, 13.7 Common – Emitter Amplifier
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Common – Emitter Amplifier Vac D1 C1 Q1 Vout V1=24V V2=9V C2 C3 R4=1k R5=1k R1 =73k R3 =100 R2 =220 Diode: V on = 0.7V, I S = 25×10 -6 A Q1: V on = 0.7V, I S = 1.83×10 -14 A, β F = 100, V A = 15V V AC = 1mV, f = 1kHz V out ?
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Common – Emitter Amplifier (DC Analysis) Vac D1 Q1 Vout V1=24V V2=9V R4=1k R5=1k R1 =73k R3 =100 R2 =220 Q1 Vout V1=24V V2=9V R1 =73k R3 =100 R2 =220
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Unformatted text preview: Common – Emitter Amplifier (DC Analysis) Q1 V1=24V V2= -9V R1=73k R3 =100 R2 =220 V1=24V Forward active region Common – Emitter Amplifier (AC Analysis) Vac D1 Q1 Vout R4=1k R5=1k R1 =73k R3 =100 R2 =220 Vac R1 R4+R5 r π r o R3 g m v be rd Common – Emitter Amplifier (AC Analysis) v ac R1 R4+R5 r π r o R3 g m v be rd Since Vac << Von, Diode has Ion (V~0V) = 0A; v b...
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