14–71 Biquad Filter A biquad filter has the unique properties of having the ability to alter the filter’s parameters, namely, gain K, quality factor Q, and resonant frequency ω0. This is done in each case by simply adjusting one of the circuit’s resistors. Furthermore, adjusting any of the three parameters leaves the others unchanged.

Analyze the biquad circuit in Figure P14–71 and determine which resistors influence each parameter. Explain how you can adjust three resistors in a specific order to set all three parameters.

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R ww C HH C R5 R3 www R R4 R www V(t) FIGURE P14-71 + V(1)