Circuits with biquadratic transfer function for active RC filters realization - biquads

• LP1, HP1, BP1  - single-amplifier Sallen-Key circuits for lowpass (LP), high pass (HP) and bandpass (BP) for realization of transfer functions with small Q-factor. A value of capacitor  is required for the design algorithm "K=1" , and the other parameters [ , , ] (value of resistor , DC open-loop gain  and unity-gain frequency  of operational amplifier) are optional. Value of capacitors  and  are required for the design algorithm " min. ", and the other parameters [ , , ] are also optional.
• BP2  -  Generalized Impedance Converter (GIC) for bandpass filters with . The circuit contains two amplifiers as a circuit implementing synthetic inductor. A value of capacitor  is required for the design, and the other parameters [ , ] are also optional. However, the unity-gain frequency  of operational amplifier should be entered, because this value is necessary to compute the compensation resistance .
  

• LP2, BP3  - Ackerberg-Mossbergùv circuit for realization lowpass (LP) and bandpass (BP) filters with a high Q-factor.
• LP3, BP4  - Tow-Thomasùv circuit for realization lowpass and bandpass filters with a high Q-factor. A value of capacitor  is also required for design, the other parameters are optional, but unity-gain frequency  of operational amplifier should be entered, because this value is necessary to compute the compensation capacitance .
  

• ES1  - general biquadratic section based on Tow-Thomas circuit, which is a basic circuit for realization of elliptic transfer functions. A value of capacitor  is required for design, and the other parameters are optional. However, unity-gain frequency  of operational amplifier should be entered, because this value is necessary to compute the compensation capacitance .
• ESLP, ESHP, ESNotch  - alternative single-amplifier circuits using double T-network feedback for realization of elliptic transfer functions (lowpass - LP, highpass - HP and notch types) with small Q-factor ( ). Value of capacitors ,  and resistor  are required for design, while the other parameters are optional.
  
  

• LP0, HP0  - circuits for realization first-order transfer functions (lowpass - LP and highpass - HP), where a value of the capacitor  is required for design.