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Lectures 7+8

# Lectures 7+8 - Lectures 7 8 Diode circuits LEDs Some more...

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Lectures 7+8 Diode circuits, LEDs

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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
Vout Vin simple diode circuit + Vin - I + Vout - Turn-on V Vin -4 -2 0 2 4 0 2 4 6 8 10 12 14 time Volts Vout -4 -2 0 2 4 0 2 4 6 8 10 12 14 time Volts 2 cases: Vin< Vto barb2right I=0, Vout=Vin Diode is an open circuit Vin>Vto barb2right 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

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Vout Vin simple diode circuit Turn-on V + Vin - I + Vout - R Vin -4 -2 0 2 4 0 2 4 6 8 10 12 14 time Volts Vout -4 -2 0 2 4 0 2 4 6 8 10 12 14 time Volts Note this is also a “½ wave rectifier” + Vto - 2 cases: Vin< Vto barb2right I=0, Vout=0 Diode is an open circuit Vin>Vto barb2right Vout = Vin-V to , I=(Vin-Vto)/R Diode is a V-source = Vto
Vout Vin Full-wave rectifier circuit + Vin - + Vout -

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Lectures 7+8 - Lectures 7 8 Diode circuits LEDs Some more...

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