00:01
Hello, in the question we have to determine the circuit oscillation frequency for fet colpitts oscillator.
00:09
So, we have given this fet colpitts oscillator.
00:21
So, we have written over here because this fet oscillator has some arrangement.
00:33
So, according to that they have given this c1 as equal to 750 pf, c2 is given to be 2500 pf and the inductance is given to be 40 uh.
00:57
So, now with this information we have to calculate the oscillatory frequency or the frequency of oscillations.
01:09
So, now here in order to find out first we need to calculate the equivalent.
01:17
So, it will be 1 upon c equivalent.
01:19
So, that should be equal to 1 upon c1 plus 1 upon c2 because the capacitance are in series in this fet.
01:28
So, now if we plug the value so it will be 1 upon c1 is 750 plus 1 upon 2500.
01:37
So, if we do the cross multiplication so this will be 2500 plus 750 divided by this is 750 times 2500.
01:51
So, now if we just reciprocate and calculate so i get c equivalent as equals to 576 point.
02:11
So, this is 1 upon c equivalent.
02:13
So, that is why we will first reciprocated and then solve.
02:18
So, this will give me 576 .923 pf.
02:24
So, now with this c equivalent we can find out this oscillatory frequency...