Positive feedback biquad filter

Details Positive feedback biquad filter Positive feedback biquad filter

1979-08-23

1981-10-06

Mullins, James B.

Amplifiers

Signal feedback

Amplifier in signal feedback path

330109, 330112, H03F 134

Patent

active

042938201

ABSTRACT:
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 connected to receive an input signal. The RC section realizes 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 operational amplifier. The other resistive T-network is connected to a negative input of the operational amplifier.

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