The document discusses diode circuits and rectifiers. It explains diode models, including the typical 0.7V forward voltage drop for silicon diodes. It also discusses half-wave and full-wave rectification circuits using diodes, defining the average and RMS values of rectified sinusoidal waveforms. The document provides examples of calculating voltage and current values in various diode circuits.

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GATE SERIES

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5. Diode models
•Barrier voltage for silicon diode =0.7 V , for germanium diode = 0.3 V
•Forward resistance
•OPEN in reverse bias
• V = mA /KΩ
•Power in watts  convert mA into A and KΩ into Ω
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13. RECTIFIERS
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14. For a pure sinusoidal waveform
this average or mean value will
always be equal to 0.637 x Vmax
The effective or R.M.S. value will
always be equal to 1/√2 x Vmax
which is equal to 0.707 x Vmax
=1.1
=1.414
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27. RIPPLE
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29. Obtain the value of V and I in each case of Figs. (a–f),
assuming the drop across the diode of 0.7 V.
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30. Obtain the value of V and I in each case of Figs. (a–e), assuming
the drop across the diode of 0.7 V.
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31. Obtain the values of V and I in Fig., assuming the drop across the
diode of 0.7 V.
Three voltages (2.3 V,
1.3 V, and 0.3 V) try to
appear at the point V,
but at a node no more
than one voltage can
appear. Hence, one
voltage will appear
forcing the other two
not to appear through
diodes D1 and D2.
Hence, V = 2.3 V and I
= 2.3 mA.
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32. Obtain the values of V and I in Fig. 3.39, assuming the drop across the diode
of 0.7 V.
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