What is a Varicap diode used for?
Varactor or varicap diodes are used mainly in radio frequency or RF circuits to provide voltage controlled variable capacitance. These electronic componenta can be used in a whole variety of ways where a capacitance level needs to be controlled by a voltage.
How does a Varicap diode work?
Definition: Varactor diode is the one which works on the principle of variation in capacitance by changing the width of the depletion region of P-N junction. The P-N Junction diode creates capacitor effect. The capacitance is controlled by applied voltage. It works on reverse biased mode.
What is the symbol of varactor diode?
Symbol of Varactor Diode The symbol of the varactor diode is similar to that of the PN-junction diode. The diode has two terminals namely anode and cathode. The one end of a symbol consists the diode, and their other end has two parallel lines that represent the conductive plates of the capacitor.
What is positive clipper circuit?
A Clipper circuit in which the diode is connected in series to the input signal and that attenuates the positive portions of the waveform, is termed as Positive Series Clipper. This makes the diode forward biased and hence it conducts like a closed switch.
What will happen to the depletion region of a Varicap if you use forward bias voltage?
The width of the depletion region depends on the type of biasing technique used. If it is in forward bias condition, the depletion region will be narrow and the conduction current takes place. In reverse biasing, the depletion region will be wide and will block the current.
In what condition a Varicap works?
It always works in reverse bias condition and is a voltage-dependent semiconductor device. Varactor diode is known by several names as Varicap, Voltcap, Voltage variable capacitance, or Tunning diode.
What kind of a device is a diode?
A diode is a semiconductor device that essentially acts as a one-way switch for current. It allows current to flow easily in one direction, but severely restricts current from flowing in the opposite direction.
What is positive and negative clipping?
A Clipper circuit in which the diode is connected in series to the input signal and that attenuates the positive portions of the waveform, is termed as Positive Series Clipper. Negative Cycle of the Input − The negative cycle of the input makes the point A in the circuit negative with respect to the point B.