The capacitance of a varactor diode is
- inversely proportional with reverse bias voltage.
- a linear function of applied reverse bias voltage.
- directly related to the forward bias voltage.
Explanation
A varactor is used for its voltage-variable junction capacitance. Increasing the reverse bias widens the depletion region, which acts like a wider gap between capacitor plates, so the capacitance falls. Capacitance therefore varies inversely with the applied reverse-bias voltage; it is not a simple linear function and forward bias is not used.
mcreedengineer asking:
As reverse voltage increases, depletion layer and therefore capacitance increases proportionally. Am I missing something here?
Community Comments (3)
D
dimky Posts: 514 08.06.2014 / 22:39
M
mcreedengineer Posts: 1 04.07.2014 / 16:24
Thank you.
P
paulma6 Posts: 2 05.07.2014 / 01:32
When the voltage increase, it is as if the thickness of the dielectric was going greater and therefore the capacitance decrease.CQFD
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