Hi everyone,
what i know about the varactor diode is that it changes its capactance according to the applied voltage across it (when connected in reverse biase with the source),therefor ,it can be used in a tank circuit which is a part of FM circuit....correct me if iam wrong.
the tank circuit(which has the varactor part of it) needs a DC voltage to ring .at the same time the varactor diode needs an AC voltage to change its capactance and the frequency of the tank circuit(varactor in parallel with inductor).
using that we can get an oscillation signal keep changing its frequency according to to the AC input signal(forget about the continuity of oscillaton).what ineed to know is the connection of both supplies(DC/AC) to the tank circuit to get FM oscillation.(iwill be thankful if some one has a small circuit with explations)
THanks
what i know about the varactor diode is that it changes its capactance according to the applied voltage across it (when connected in reverse biase with the source),therefor ,it can be used in a tank circuit which is a part of FM circuit....correct me if iam wrong.
the tank circuit(which has the varactor part of it) needs a DC voltage to ring .at the same time the varactor diode needs an AC voltage to change its capactance and the frequency of the tank circuit(varactor in parallel with inductor).
using that we can get an oscillation signal keep changing its frequency according to to the AC input signal(forget about the continuity of oscillaton).what ineed to know is the connection of both supplies(DC/AC) to the tank circuit to get FM oscillation.(iwill be thankful if some one has a small circuit with explations)
THanks