Halfwave Rectifier
The basic circuit for half-wave rectification is shown in Figure (a). We can assume that the diode has essentially infinite resistance in the reverse direction (for a voltage v less than the cut-in voltage Vγ) and a small and constant resistance Rf in the forward direction (for v > Vγ). Since in a rectifier circuit the input vi = Vm sinωt has a peak value Vm which is very large compared with the offset voltage Vγ, we assume in the following discussion that Vγ = 0. Subject to this idealization of the diode characteristic, the current i in the diode or load (RL) is given by
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