Electronics Handbook/Circuits/Tuned Resonance Selected Band-pass Filter

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Circuit Configuration[edit | edit source]









Analysis[edit | edit source]

  • At ω = 0 , Capacitor opens circuit . Therefore, I = 0
  • At Resonance Frequency , Impedance of L and C cancel out.

Therefore, the Impedance of the circuit is R and at minimum value and Current will be at its maximum value

ZL - ZC = 0 .
Z = ZR + ZL + ZC = ZR + 0 = R
  • At ω = 0 , Inductor opens circuit . Therefore, I = 0

From three paired value ω and I graph of I - ω can be plotted . From graph

ω I
0 0
00 0

At resonance frequency , current is at its maximum value . If the current is reduced to half the resonance value then the circuit is respond to a bandwidth of frequencies . Further reduce or increase the value of the current below or above the circuit will respond to a Wider or Narrower Bandwidth

In conclusion, RLC series can be used as a Resonance Tuned Selectede Band Width Filter by Tuning L or C into Resonance Frquency to have a maximum value . Increasing or Descreasing the value of R to yield a desired bandwidth

Summary[edit | edit source]

Tuned Resonance Selected Band Pass Filter Operation
RLC eries
1) Tune L or C into Resonance Frquency
. Current is at its mmaximum value

2) Reduce Current by increasing R
. Current value at voltage is stable over a band width
. Current under the value I < Current is stable over a wide band width
. Current over the value I > Current is stable over a narrow band width