given : (r2/r1 ) = (r4/r3 )
c = 1nf , F= 2 Mhz
Required : output voltage and oscillation frequency at 3 cases
a- (r2/r1 )= (r4/r3 ) b- (r2/r1 )> (r4/r3 )
c-(r2/r1 )< (r4/r3 )
intial conditions : I (coil )= Io (i.e. doesnot equal 0 )
Vcap = 0
My attempts so far :
1- i deduced the L that satisfies parallel resonance between the parallel R-L-C , such that L= 6.33uH and at resonance the Z ( total ) = L /C
2-Since the RLC are at resonance , then the intial current Io travels in the parallel RC giving a rise to the cap voltage.
3- since the cap voltage equals the V+ then V+ increases
what i failed to understand is that :
from the voltage division
V- = Vo ( r1 / r1+ r2 )
V+ = Vo ( Z / Z+ r4 ) where z is the parallel RLC ; Z= L/C
so when Vc increases V+ increases and so does V- , this doesnt seem logical and i can't figure out what im missing out here
Thx in advance for your help