The standard biquad filter circuit produces lowpass and bandpass responses, and the addition of a fourth op amp produces a highpass response. Removing R₁₀ and adjusting various component values produce a notch or bandstop response or an allpass

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Other Materials from the Main Document

• Article «Digital potentiometers enable programmable biquadratic filter»
• Figure 1. Digital potentiometers adjust the corner frequency, Q, and gain for this biquad analog filter
• Figure 2. Noise (a) and low bandwidth (b) plague switched-capacitor filters. The biquad filter of Figure 1 maintains less than 1% THD+N over the range 20 Hz to 200 kHz
• Figure 2. Noise (a) and low bandwidth (b) plague switched-capacitor filters. The biquad filter of Figure 1 maintains less than 1% THD+N over the range 20 Hz to 200 kHz
• Figure 3. The standard biquad filter circuit produces lowpass and bandpass responses, and the addition of a fourth op amp produces a highpass response. Removing R₁₀ and adjusting various component values produce a notch or bandstop response or an allpass