Diodes. Midterm exam. Ideal diode. Semiconductors and doping. Notes. Eugeniy E. Mikhailov. Lecture 05. Notes

Transcription

1 Diodes. Eugeniy E. Mikhailov The College of William & Mary Lecure 5 Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 1 / 13 Miderm exam Where: n he lab When: During he firs hour of he lab Maerial: everyhing from firs 4 weeks of class esisors, capaciors, inducors, and ransformers. Kirchhoff s laws Complex impedances. Thévenin s heorem Source impedance and volage olage divider in various forms Filers Lab will follow he miderm. You can skip design exercise preparaion prior o he lab. However, a he ime of log book submission i mus be fully done. Trea i as a home work. Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 2 / 13 deal diode Cahode everse region Forward region Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 3 / 13 Semiconducors and doping ure semiconducor Ge Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 4 / 13

2 Semiconducors and doping ure semiconducor -doped Ge Ga Ga Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 4 / 13 Semiconducors and doping ure semiconducor -doped -doped Ge Ga As Ga As Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 4 / 13 -juncion o bias E in Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 5 / 13 -juncion o bias everse bias E in E in E ex Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 5 / 13

3 -juncion o bias everse bias Forward bias E in E in E in E ex E ex Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 5 / 13 eal diode Cahode ) ( ) = (e /(n T ) 1 Typical parameers sauraion curren = 1 na hermal volage T = kt q = m a 3 K emission coefficien n = 1..2 pn Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 6 / 13 eal diode Cahode ) ( ) = (e /(n T ) 1 Typical parameers sauraion curren = 1 na everse region Forward region hermal volage T = kt q = m a 3 K emission coefficien n = 1..2 pn Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 6 / 13 mplified diode Cahode pn diode - juncion opening volage pn =.6 for everse region Forward region pn =.3 for Ge $ pn $ A bi more realisic diode ( r f ) deal pn deal f r Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 7 / 13

4 Diodes applicaions Circui roecion ecificaion curren gae half wave recifier full wave recifier ower Supplies Frequency manipulaion Frequency muliplier Mixers and more... olage clamps ligh emiing diodes (LED) phoo-diode Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 8 / 13 Half-wave recifier, curren gae in ou d in() = cos(ω) ou() Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 9 / 13 Full-wave recifier: in d ou in Why ou in max( ou ) = 2 d? 2 d in() = cos(ω) ou() Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 1 / 13 Full-wave recifier filered - power supply in 2 d C in() = cos(ω) ou (), C1 rec() ou (), C2 > C1 ou ipples size () = Q() C = max = Q max d C C d C d = max () = max = max T = 1 2f in T C max 2Cf in Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 11 / 13

5 Full-wave recifier as Frequency doubler in ou 2d in() = cos(ω) ou() Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 12 / 13 Full-wave recifier as Frequency doubler in ou 2d in() = cos(ω) ou() 2nd () = cos(2ω) Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 12 / 13 Full-wave recifier as Frequency doubler in ou 2d FFT in() = cos(ω) ou() 2nd () = cos(2ω) Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 12 / 13 Full-wave recifier as Frequency doubler in ou 2d in() = cos(ω) ou() 2nd () = cos(2ω) FFT in() = cos(ω) ou(ω) ω/ω Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 12 / 13

6 Full-wave recifier as Frequency adder in1 ()= 1 cos(ω 1 ) L ou in2 ()= 2 cos(ω 2 ) ou () = in () = = ( 1 cos(ω 1 ) + 2 cos(ω 2 )) cos2 (ω 1 ) cos(ω 1 ) cos(ω 2 ) cos2 (ω 2 ) 2 in () = Assuming 1 2 ou () 1 2 cos2 (ω 1 ) cos(ω 1 ) cos(ω 2 ) cos2 (ω 2 ) ( 1 cos(ω 1 ) + ) 2 cos(ω 1 ) cos(ω 2 ) ( 1 1 cos(ω 1 ) + ) 2 cos((ω 1 + ω 2 )) + cos((ω 1 ω 2 )) 1 2 Eugeniy Mikhailov (W&M) Elecronics 1 Lecure 5 13 / 13