The level of transition capacitance can be controlled with an assistance of applied biasing because

Q.  The level of transition capacitance can be controlled with an assistance of applied biasing because the thickness of transition ( or depletion) layer is dependent on the quantity of _________
- Published on 20 Oct 15

a. Forward Biasing
b. Reverse Biasing
c. Transistor Biasing
d. All of the above

ANSWER: Reverse Biasing
 
Transition capacitance mainly occurs when P-N junction is in reverse-biased mode. This is so because P and N regions possesses low resistance on individual sides and therefore act like the plates of capacitor. However, the property by which level of capacitance variation can be maintained by application of biasing can be utilized for the construction of a device known as 'Varicap' or 'Varactor' or 'voltacap'. Basically, the capacitance is voltage dependent and can be expressed as,

CT = K / (Vk + VR ) n

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