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
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
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
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
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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