LCLR Resonance...

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Original poster: "Rajesh Seenivasan" <rajeshkvs@xxxxxxxxxxx>

Dear forum members,

Yesterday, I tried to simulating the behavior of a LCLR circuit using 
PSPice. I connected a LCLR circuit to an AC source (sine wave 
generator). The analysis type was 'AC sweep'.
Using PSpice, I plotted various graphs with Frequency on the x-axis 
and the following three parameters in Y-axis:
1. Current through Parallel Inductor (inductor in tank circuit)
2. Current through Parallel Capacitor (capacitor in tank circuit)
3. Current through Series inductor.

My understanding is that at resonance:
1. The current through the tank circuit's L and C will be same.
2. The tank circuit's (either through L or C) will be IN PHASE with 
the input sine wave source.

Question:
I noticed that at resonant frequency the current through the Series 
inductor was not IN PHASE with the input AC (sine wave) source. The 
phase difference between the AC source and the current through the 
series inductor was approximately 90 degrees. Is that true?
Also, I have read in some SSTC articles that explains the use of PLL 
to auto-tune the coil.  Is it possible to use the current through the 
series inductor as the feedback signal? One thing I noticed is that 
at resonance, the series inductor current is not in phase with the ac 
sine wave source.
I can use the current through the Tank circuit's L or C will be in 
phase at resonance and it can act as a feedback (either using an 
antenna or current transformer). But, I would like to use the series 
inductor's current to lock to the resonant frequency. Please let me 
know your suggestions.

Thanks and regards,
Raj.