![]() So, because of this property they are used in the RF communication systems and this is the symbol of the varactor diode. Particularly when we want to change the capacitance in the circuit using the external applied voltage the frequency of the circuit will change. This property of the varactor diode is very useful in many applications. So, in this diode, as we change the applied reverse bias voltage, its capacitance or in other words its reactance will change. The varactor diode was first developed in 1961 by Pacific Semiconductor Subsidiary. Similarly the term varactor refers to the variable reactance. The term varicap refers to the variable capacitance. So, these diodes are also known as the varicap diodes. Varactor diodes are the one type of pn junction in which by applying reverse bias voltage we change the internal capacitance of the diode. Important specification of the Varactor diodes:. ![]()
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