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Analog Electronics
Semiconductor Physics
Energy Band TheoryIntrinsic SemiconductorsExtrinsic Semiconductors N-TypeExtrinsic Semiconductors P-TypeCarrier ConcentrationDrift CurrentDiffusion CurrentEinstein RelationHall EffectContinuity Equation
Diodes & Applications
PN Junction FormationPN Junction Forward BiasPN Junction Reverse BiasDiode IV CharacteristicsShockley Diode EquationDiode Equivalent CircuitsDiode AC ResistanceZener DiodeZener Voltage RegulatorHalf Wave RectifierFull Wave Center Tap RectifierBridge RectifierCapacitor FilterPi FilterSeries ClipperShunt ClipperPositive ClamperNegative ClamperVoltage MultiplierLEDPhotodiodeVaractor DiodeTunnel DiodeSchottky Diode
BJT Amplifiers
BJT Structure and ConstructionBJT NPN OperationBJT PNP OperationBJT Current RelationshipsBJT Operating RegionsBJT Input Output CharacteristicsFixed Bias CircuitCollector Feedback BiasVoltage Divider BiasEmitter BiasBJT Bias StabilityCommon Emitter AmplifierCommon Base AmplifierCommon Collector AmplifierBJT Small Signal ModelH Parameter AnalysisBJT Frequency ResponseMultistage AmplifiersDarlington PairCascode AmplifierDifferential AmplifierPower Amplifiers Class APower Amplifiers Class BPower Amplifiers Class AB
FET Amplifiers
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Operational Amplifiers
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Oscillators & Timers
Barkhausen CriterionRC Phase Shift OscillatorWien Bridge OscillatorColpitts OscillatorHartley OscillatorClapp OscillatorCrystal Oscillator555 Timer Astable Mode555 Timer Monostable ModeWaveform GeneratorsVoltage Controlled OscillatorPhase Locked Loop
Filters
Passive RC Low Pass FilterPassive RC High Pass FilterActive Low Pass FilterActive High Pass FilterActive Band Pass FilterActive Band Stop FilterButterworth Filter DesignChebyshev Filter DesignBessel FilterFilter Frequency Response
Power Electronics Basics
Linear Voltage Regulator78xx 79xx SeriesAdjustable Voltage Regulator LM317Switching Regulator Basics
Other Topics
Other Subjects
Digital ElectronicsSignals & SystemsControl SystemsElectromagnetic TheoryDigital CommunicationAnalog CommunicationNetwork AnalysisMicroprocessorsVLSI DesignVerilog HDLPower ElectronicsEmbedded SystemsDSPElectronic Devices
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4 of 10 articles

Active High Pass Filter

Active HPF design, Butterworth response.

Darshan N
Updated: 19 March 2026
10 min read

Active High Pass Filter

Test your understanding of active HPF design using the Sallen-Key topology and Butterworth response conditions.

Question 1 of 3

Q1.A second-order active HPF is designed by replacing the resistors and capacitors of a Sallen-Key LPF using the standard LP-to-HP frequency transformation. The transformation applied to the component values is:

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Active Band Pass Filter