Berkeley ELENG 40 - Lecture Notes (31 pages)

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Lecture Notes



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Lecture Notes

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Pages:
31
School:
University of California, Berkeley
Course:
Eleng 40 - Introduction to Microelectronic Circuits
Introduction to Microelectronic Circuits Documents

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EE40 Lec 18 Diode Circuits Reading Chap Reading Chap 10 of Hamble Hambley Supplement Reading on Diode Circuits http www inst eecs berkeley edu ee40 fa09 handouts EE40 http www inst eecs berkeley edu ee40 fa09 handouts EE40 MOS Circuit pdf MOS Circuit pdf EE40 Fall 2009 Slide 1 Prof Cheung Diodes Circuits Load Line Analysis y Analysis of Diode Circuits by assumed states Diode Logic Circuits Wave Shaping Circuits Rectifying Rectifying Circuits EE40 Fall 2009 Slide 2 Prof Cheung SOLVING CIRCUITS WITH NONLINEAR ELEMENTS Look at circuits with a nonlinear element like this IL INL Nonlinear Linear circuit VL VNL element A nonlinear element with its own I V relationship attached to a linear circuit with its own I V relationship 1 2 3 4 IL fL VL INL gNL VNL INL IL VNL VL EE40 Fall 2009 linear circuit I V relationship nonlinear element I V relationship Slide 3 Prof Cheung SOLVING CIRCUITS WITH NONLINEAR ELEMENTS The 4 equations can be reduced to 2 equations in INL and VNL INL fL VNL the linear loadline INL gNL VNL which we can equate and solve for VNL or graph the two equations and solve for the intersection EE40 Fall 2009 Slide 4 Prof Cheung EXAMPLE 1 k 2V IL INL VL V NL 1 IL VL 2 1000 2 Given I0 10 15 A Find VNL VNL 0 026 15 INL 10 e 1 3 INL IIL 3 4 VNL VL Substitute 1 and 2 in 3 10 15 e VNL 0 026 1 VNL 2 1000 Solve by iteration VNL 0 725V EE40 Fall 2009 Slide 5 Prof Cheung Graphical Solution 0 004 linear nonlinear 0 0035 0 003 Loadline I V 2 1000 0 0025 I NL 0 002 0 0015 0 001 0 0005 Diode I V 0 0 725V 0 0005 0 001 1 0 5 0 0 5 1 V NL EE40 Fall 2009 Slide 6 Prof Cheung Piecewise linear Model of Nonlinear Devices 5 5V intercept 1 5V intercept Segment A i v 400 Segment g B i v 1 5 100 Segment C i v 5 5 800 EE40 Fall 2009 Slide 7 Prof Cheung Ideal Diode Model of PN Diode Circuit symbol ID I V characteristic ID A VD Switch model ID forward bias reverse bias VD VD V Diode behaves like a switch closed in forward bias mode open in reverse bias mode used when voltage of interest 0



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