Positive feedback biquad filter

Details Positive feedback biquad filter Positive feedback biquad filter

H - Electricity

03

H

333/52

H03H 11/12 (2006.01) H03F 1/38 (2006.01) H03K 3/04 (2006.01)

Patent

CA 1154107

POSITIVE FEEDBACK BIQUAD FILTER Abstract of the Disclosure A positive feedback RC active biquadratic filter circuit comprising a passive input RC section and an active amplification output section having at least one operational amplifier. The RC section has two true resistive T-networks and a true capacitive T-network con nected to receive an input signal. The RC section rea- lizes a second order function with a low Q factor. The operational amplifier has a feedback resistive connection from an output thereof to a mid-junction point between each of three capacitances in the capacitive T-network. The capacitive T-network and one of the two resistive T- networks are connected to a positive input of the opera- tional amplifier. The other resistive T-network is con- nected to a negative input of the operational amplifier. -1-

358636

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