A novel approach for the automatic tuning of continuous time filters

This approach uses a charge comparison principle for the tuning of the pole frequency (ω₀) and the pulse response of a biquadratic filter for tuning the filter quality factor (𝒬). Both frequency and 𝒬 tuning are performed at lower frequency than the pole frequencies. Thus, these techniques reduce the tuning signal feedthrough in bandpass filters. The 𝒬 tuning includes the filter high-frequency effects. Simulated results and breadboard experimental results are presented and discussed