EE 332 week 6a - 7/22/2010 EE 332 DEVICES AND CIRCUITS II...

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7/22/2010 1 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock EE 332 DEVICES AND CIRCUITS II WEEK 6 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock CB AMPLIFIER (NONINVERTING) / SMALL SIGNAL MODEL Small signal model R s v S C1 R 2 R 1 R C R E Q1 C2 V CC R L v o Ignore r o since it is large
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7/22/2010 2 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock CB AMPLIFIER (NONINVERTING) / INPUT RESISTANCE R i R E Input resistance: r e ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock CB AMPLIFIER (NONINVERTING) / OUTPUT RESISTANCE R o Output resistance: Recall CE amplifier output resistance, r c R C The CB output resistance would be:
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7/22/2010 3 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock CB AMPLIFIER (NONINVERTING)/ GAIN R s v S C1 R 2 R 1 R C R E Q1 C2 V CC R L v o Problem : Find the gain of CB amplifier Given : ,, 0.8 , 0.1 , 100 1: 1.5, 100 BE ON CE sat F RA v V V V Q VV     12 10 ; 30 ; 5.1 ; 2.2 ; 100 ; 1 ; 12 ; 10 CE s L CC R k R k R k R k R R k V V C C F ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock CB AMPLIFIER (NONINVERTING)/GAIN ANSWER Step 1: DC analysis DC effects on the dash box 4-resistor BJT circuit
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7/22/2010 4 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock CB AMPLIFIER (NONINVERTING)/ GAIN ANSWER Assuming BJT operating in forward active mode Theveninizing LHS circuit ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock CB AMPLIFIER (NONINVERTING)/ GAIN R EQ V EQ R C R E Q1 V CC v o ANSWER I C I E I B
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7/22/2010 5 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock CB AMPLIFIER (NONINVERTING)/ GAIN ANSWER Step 2: Small Signal Parameters: ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock CB AMPLIFIER (NONINVERTING)/ GAIN ANSWER R s v S C1 R 2 R 1 R C R E Q1 C2 V CC R L v o v o v s R 2 R 1 R C R L r g m v be v be R s
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7/22/2010 6 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock CB AMPLIFIER (NONINVERTING)/ GAIN ANSWER v o v s R 2 R C R L r g m v be v be R s R 1 r c R B v b v e ©UW EE TC Chen
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EE 332 week 6a - 7/22/2010 EE 332 DEVICES AND CIRCUITS II...

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