EE 330 Lect 25 Spring 2011

EE 330 Lect 25 Spring 2011 - EE 330 Lecture 25...

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EE 330 Lecture 25 Amplification with Transistor Circuits
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MT 1 MT 2 G I T V M21 V GT1 I G I T V M21 I G4 >I G3 >I G2 >I G1 =0 V M21 V GT1 Quadrant 1 Quadrant 2 Quadrant 3 Quadrant 4 Quadrants of Operation Defined in V M21 -V GT1 plane (not in the I T -V M21 plane) But for any specific circuit, can map quadrants from the V M21 -V GT1 plane to I T -V M21 plane Review from Last 2 Lecture
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MT 1 MT 2 G I T V M21 V GT1 I G V M21 V GT1 Quadrant 1 Quadrant 2 Quadrant 3 Quadrant 4 Identification of Quadrants of Operation in I T -V M21 plane Review from Last 2 Lecture
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MT 1 MT 2 G I T V M21 V GT1 I G V M21 V GT1 Quadrant 1 Quadrant 2 Quadrant 3 Quadrant 4 Identification of Quadrants of Operation in I T -V M21 plane Curves may not be symmetric between Q 1 and Q 3 in the I T -V M21 plane Turn on current may be large and variable in Q 4 (of the V M21 -V GT1 ) Generally avoid operation in Q 4 (of the V M21 -V GT1 plane) Most common to operate in Q2-Q3 quadrants or Q1-Q3 quadrants (of the V M21 -V GT1 plane) Review from Last 2 Lecture
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Some Basic Triac Application Circuits V AC R L V TR I T MT 1 V GG V AC R L V TR I T MT 1 V GG V M21 V GT1 Quadrant 1 Quadrant 2 Quadrant 3 Quadrant 4 Quad 1 : Quad 4 (not attractive because of Quad 4) (V GG often from logic/control circuit) (V GG often from logic/control circuit) Quad 2 : Quad 3 Review from Last 2 Lecture
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Amplification with Transistors Generally, an amplifier or simply amp , is any device that changes, usually increases, the amplitude of a signal . The "signal" is usually voltage or current. From Wikipedia: •It is difficult to increase the voltage or current very much with passive RC circuits •Voltage and current levels can be increased a lot with transformers but not practical in integrated circuits •Power levels can not be increased with passive elements (R, L, C, and Transformers) Often an amplifier is defined to be a circuit that can increase power levels Transistors can be used to increase not only signal levels but power levels to a load In transistor circuits, power that is delivered in the signal path is supplied by a biasing network Review from Last Lecture
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Applications of Devices as Amplifiers MOS Bipolar Logic Circuits Linear Circuits Triode and Cutoff Saturation and Cutoff Saturation Forward Active Typical Regions of Operation by Circuit Function C V CE ,V DS I C , I D Linear Circuits Logic Circuits Review from Last Lecture
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Consider the following MOSFET and BJT Circuits R Q 1 V IN (t) V OUT V CC V EE BJT MOSFET R 1 V IN (t) V OUT V DD V SS M 1 Assume BJT operating in FA region, MOSFET operating in Saturation Assume same quiescent output voltage and same resistor R 1 One of the most widely used amplifier architectures
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Consider the following MOSFET and BJT Circuits R 1 Q 1 V IN (t) V OUT V CC V EE BJT MOSFET R 1 V IN (t) V OUT V DD V SS M 1 MOS and BJT Architectures often Identical Circuit are Highly Nonlinear Nonlinear Analysis Methods Must be used to analyze these and almost any other nonlinear circuit
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Methods of Analysis of Nonlinear Circuits
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EE 330 Lect 25 Spring 2011 - EE 330 Lecture 25...

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