Mechanically controlled variable capacitors allow the plate spacing to be adjusted, for example by rotating or sliding a set of movable plates into alignment with a set of stationary plates. Low cost variable capacitors squeeze together alternating layers of aluminum and plastic with a screw. Electrical control of capacitance is achievable with varactors (or varicaps), which are reverse-biased semiconductor diodes whose depletion region width varies with applied voltage. They are used in phase-locked loops, amongst other applications.
Mechanically controlled variable capacitors allow the plate spacing to be adjusted , for example by rotating or sliding a set of movable plates into alignment with a set of stationary plates . Low cost variable capacitors squeeze together alternating layers of aluminum and plastic with a screw . Electrical control of capacitance is achievable with varactors ( or varicaps ) , which are reverse - biased semiconductor diodes whose depletion region width varies with applied voltage . They are used in phase - locked loops , amongst other applications .
What varies as a function of voltage in varactors?
What varies as a function of voltage in varactors ?
depletion region
depletion region