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EE 332 week 9a

# EE 332 week 9a - EE 331 DEVICES AND CIRCUITS I SOLID-STATE...

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8/12/2010 1 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock EE 331 DEVICES AND CIRCUITS I SOLID-STATE ELECTRONICS WEEK 9 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock DIRECT-COUPLED AMPLIFIER / INTRODUCTION pnp CE amplifier npn CC amplifier (voltage follower) R I R S1 Q 3 v o v i R G R C2 R E2 R E3 R L R D1 V CC Q 2 Coupling capacitors block DC and low frequency signals, therefore we must use DC-coupled amplifiers when low frequency (or DC) amplifications is required. C 4 C 2 M 1 -V EE NMOS CS amplifier 4

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8/12/2010 2 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock DIRECT-COUPLED AMPLIFIER / INTRODUCTION Question: Why do we alternate NMOS, pnp, and npn stages? Q 1 V c1 Q 2 V E2 V c2 5 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock DIRECT-COUPLED AMPLIFIER / INTRODUCTION Question: Why do we alternate NMOS, pnp, and npn stages? Q 1 V c1 Q 2 V E2 V c2 6
8/12/2010 3 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock DIRECT-COUPLED AMPLIFIER / EXAMPLE , , 2 2,3, 2,3 2,3 3 150 0.7 , 80 F BE ON A F V V Q V   Analyze the given multi-stage amplifier 1 1 2 2 3 2 4 10 , 1 , 620 , 1.6 , 1.4 , 4.7 , 3.3 , 250 , 22 , I G D S E C E

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