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Published byIsis Holgate Modified over 2 years ago

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Op-Amp Based Band Pass Filter

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Equivalent Circuit @ DC (DC feedback)

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Equivalent Circuit @ ω=ω o

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Circuit Analysis (Solve for Vout/Vin)

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Circuit Analysis

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Second Order Bandpass Filter

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Bandwidth of Second Order Bandpass Filter

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Circuit Parameters

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Matlab Script

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Cadence Simulation

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Tunable Bandpass Filter

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BPF at 100 Hz 12.396 mS 15.15 mS Vout is delayed by 2.76 mS, approximately ¼ of a period.

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Closer Look at 950 Hz (Vout is larger than Vin!)

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BPF at 10 KHz

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Question What is tunable? – Not a capacitor! (Not an absolute requirement, since you can always do switches to add/remove capacitors) – Resistor, but which resistor? Consequnce? R3+R4 R1 R2

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