Patent ID: 7075364

Claim:
A biquad filter, comprising: a first amplifier; and a second amplifier coupled to the first amplifier, the second amplifier having a negative feedback loop including a buffer having a plurality of compensation resistors, the compensation resistors each having a resistance value that results in the biquad filter having substantially zero Q-enhancement, wherein Q-enhancement represents an undesirable peak in amplitude around a pole frequency of an amplitude frequency response for the biquad filter, wherein an input of the first amplifier is coupled to an input to the biquad filter and an output of the second amplifier is coupled to an output for the biquad filter when an cutout of the first amplifier is coupled to an input of the second amplifier, and wherein the input of the second amplifier is coupled to the input to the biquad filter and the output of the first amplifier is coupled to the output for the biquad filter when the output of the second amplifier is coupled to the input of the first amplifier.