Total impedance at resonance

Total impedance at resonance, $Z_{T_{p}}$

The total impedance at resonance is now defined by $$ Z_{T_{p}} \appro R_s || R_p = R_s || Q_l^2 R_l $$ For an ideal current source ($Rs \nfty Ω$), or if $R_s >> R_p$, the equation reduces to $$ \bbox[10px,border:1px solid grey]{Z_{T_{p}} \appro Q_l^2 R_l} $$