ElectronicsI_L4 - Chapter 3-2 Diodes Diodes for Voltage...

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Chapter 3-2 Diodes
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Diodes for Voltage Regulation • Modern electronics have stringent requirements for their DC power. • The use of diodes for voltage regulation is one of their biggest applications. • We saw that the diode when connected with a resistor can be treated as a voltage divider, – from the small-signal model perspective, the diode is just a resistor – It’s low resistance reduced the ac signal by a large amount – But what might have been missed is that there was still the bias point voltage dropping across it: You couldn’t get that with a small resistor (the DC output would also be very small).
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Regulation This property might be useful for voltage regulation: – We want a constant voltage output even if we have: • Variances in the voltage (AC ripple) • Variances in the load resistance – There is hope that the diode could do the former: It will not reduce the DC voltage as much as the AC signal due to the turn-on voltage (But who wants a 0.7V regulator? We’ll get around that later) What about variances in the load resistance. Can the diode handle that without large changes in the voltage drop across it? – Yes it will. Consider that the diode is a device who’s current
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ElectronicsI_L4 - Chapter 3-2 Diodes Diodes for Voltage...

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