Such a circuit only clip-off the input signal during the positive cycles i.e. During the negative half-cycle, the diode remains reverse-biased (open) and the whole input signal appears across the diode. The positive half-cycle of the output wave depicts this with a flattened shape. Once, the diode starts conducting only a forward voltage drop appears across the diode irrespective of the input voltage magnitude. In the above figure, initially, the diode is not conducting (open) until the input voltage reaches around 0.7V during the positive half-cycle. Figure 1: Positive diode clipping circuit ![]() The positive diode clipping circuit clips only the positive half-cycle of the input sinusoidal signal. The sinusoidal signal, which is the most commonly used alternating (bidirectional) signal, is used to explain the diode clipping. The input signal can have any form or shape that may be unidirectional or bidirectional depending on the circuit application. In simple words, for an ideal diode, it becomes short-circuited when forward biased and open-circuited when reverse-biased. Whereas, in reverse biasing, the diode does not conduct and the input signal is reflected across the diode unaltered. In forward biasing, after a certain voltage drop (0.7V for Silicon & 0.3V for Germanium) the current starts flowing and the voltage drop across the diode remains constant (0.7V or 0.3V). It is known from previous articles that a conventional diode can be put to operate in forward or reverse bias conditions. The conventional diodes, Zener diodes, and Schottky diodes can be used to alter the input signal.Ĭommonly, the conventional diodes and Schottky diodes are used in signal modifications and Zener diodes in voltage protection circuits. Especially, equipment requiring voltage to not exceed certain voltage levels such as from overvoltages, and spikes, etc. It is eminent from this that the most common use of clipping circuits is in voltage protection and wave-shaping circuits. The half-wave rectifier is an example of a diode clipping circuit because when the diode is forward biased any voltage below zero is clipped off and, similarly, when the diode is reverse biased any voltage above zero is clipped off. ![]() The clipped-off signal produced at the output becomes flat when a certain voltage limit has reached and due to this it is also termed as Diode Limiter. The output of the clipping circuit depends on the diode orientation and input signal. The diode clipper is an electronic circuit consisting of a diode(s) that clips or cuts off an input signal.
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