Lecture 8_v2 - Spring 2011 ECE 2100, A. Molnar, Cornell...

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Unformatted text preview: Spring 2011 ECE 2100, A. Molnar, Cornell University 1 Lecture 8 Diode circuits, LEDs, photovoltaics Spring 2011 ECE 2100, A. Molnar, Cornell University 2 Some more diodes Ideal diode I V I V Rev. Fwd. Bias Bias Turn-on voltage More realistic I V Turn-on voltage With series R Real diode I V I=I o (exp(V/V T )-1) Real diode with resistor I V + V- I Turn-on V is ~0.7V in Silicon Spring 2011 ECE 2100, A. Molnar, Cornell University 3 Vout Vin simple diode circuit + Vin- I + Vout- Turn-on V Vin-4-2 2 4 2 4 6 8 10 12 14 time Volts Vout-4-2 2 4 2 4 6 8 10 12 14 time Volts 2 cases: Vin< Vto I=0, Vout=Vin Diode is an open circuit Vin>Vto Vout = V to , I=(Vin-Vto)/R Diode is a V-source = Vto R Note this is called a half wave rectifier : It converts an alternating (AC) signal with zero mean into a signal with non-zero mean Vto Spring 2011 ECE 2100, A. Molnar, Cornell University 4 Vout Vin simple diode circuit Turn-on V + Vin- I + Vout- R Vin-4-2 2 4 2 4 6 8 10 12 14 time Volts Vout-4-2...
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This note was uploaded on 06/10/2011 for the course ECE 2100 taught by Professor Kelley/seyler during the Spring '05 term at Cornell University (Engineering School).

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Lecture 8_v2 - Spring 2011 ECE 2100, A. Molnar, Cornell...

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