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EE 332 Lesson 0712

# EE 332 Lesson 0712 - BJT CIRCUIT DC(LARGE SIGNAL DC...

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7/12/2010 1 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock EE 332 DEVICES AND CIRCUITS II WEEK 4 BIPOLAR JUNCTION TRANSISTORS ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock BJT CIRCUIT DC (LARGE SIGNAL) V CC /R C V CC I C V CE I B I C and V CE are the Q-point of the BJT The Q-point controls: 1. Operation region 2. Small signal parameters 3. Voltage gain, input and output resistances 4. Maximum output and input signal amplitude DC biasing (Large signal) establishes the operation point a transistor 4 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock SMALL SIGNAL OPERATION AND MODEL / SMALL SIGNAL ANALYSIS OF DIODES D D d D D d v V v and i I i Source v S contains both a DC bias part and a small signal ac part: v S : DC bias + ac signal v S = V DC + v s Total=bias + signal v S R s i D v D Expect that the diode current and voltage also contain a DC bias part and a small signal ac part. 5 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock SMALL SIGNAL OPERATION AND MODEL / SMALL SIGNAL ANALYSIS OF DIODES v S R s i D v D ( 1) D T v V D S i I e S D s D v i R v ( 1) D T V V D S I I e Diode’s characteristics are given by: Total diode current Total diode voltage Circuit characteristics are: In the absence of a signal v s , can resolve these equations for the bias value (DC): S D s D V I R V 6 ©UW EE TC Chen

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EE 332 Lesson 0712 - BJT CIRCUIT DC(LARGE SIGNAL DC...

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