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 from PART66Online
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.
M
mcreedengineer asked · 2 Jun 2014
As reverse voltage increases, depletion layer and therefore capacitance increases proportionally. Am I missing something here?
Community Comments (3)
P
PART66Online
8 Jun 2014
M
mcreedengineer
4 Jul 2014
Thank you.
P
paulma6
4 Jul 2014
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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