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Elect principles 2 filter networks

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Elect principles 2 filter networks

  1. 1. Filter Circuits – Low PassA low pass filter is one designed to pass signals at frequencies below a specifiedcut-off point, (fc ).frequencygainfC0.707Gm~~symbolT-networkL/2 L/2Cπ-networkC/2 C/2Lfc =1π LCCut-off frequency,Characteristic (Design)Impedance,Z0 = R0 =LCL =R0π fcInductance,C =1π R0 fcCapacitance,
  2. 2. Filter Circuits – High PassfrequencygainfC0.707GmA high pass filter is one designed to pass signals at frequencies above a specifiedcut-off point, (fc ).~~symbolT-network2CL2Cπ-network2L 2LCfc =14π LCCut-off frequency,Characteristic (Design)Impedance,Z0 = R0 =LCL =R04π fcInductance,C =14π R0 fcCapacitance,
  3. 3. Filter Circuits – Band Pass and Band Stopfrequencygainf1f20.707Gmsymbol~~~These filters pass or attenuate and specified band of frequencies and thus havetwo cut-off frequencies. The pass/attenuation band is the difference between f1and f2.Band PassLL/ 22CL/ 22CCBand StopLL/ 22CL/ 22CCsymbol~~~frequencygainf1f20.707Gm
  4. 4. Filter Circuits – 3-way Speaker Crossover NetworkThis arrangement of filters can be used to separate the bass, middle and treblesignals from a power amplifier to drive three speakers in a hi-fi system.PowerAmplifierBassTrebleMidrange
  5. 5. Filter CircuitsActivity1. A high pass filter is required to pass all frequencies above 5kHz and to havea design impedance of 600Ω. Calculate the circuit values for both T- and π-sections and sketch filters.2. A low pass filter is required having a characteristic impedance at zerofrequency of 400Ω and a cut-off frequency of 600Hz. Calculate the circuitvalues for both T- and π- sections and sketch the filters.
  6. 6. Filter Networks – Summary• Low-pass and high-pass filters have one pass band and one cut-offfrequency.• Band pass filters have one pass band and two cut-off frequencies.• Band stop filters have two pass bands and two cut-off frequencies.• The input impedance of the filter is called the characteristic impedance andmust be matched to the source.
  7. 7. Filter Networks – Summary• Low-pass and high-pass filters have one pass band and one cut-offfrequency.• Band pass filters have one pass band and two cut-off frequencies.• Band stop filters have two pass bands and two cut-off frequencies.• The input impedance of the filter is called the characteristic impedance andmust be matched to the source.

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