Patent ID: 7733950

Claim:
An equalizer comprising: a first biquad circuit including a first input node, a first biquad band pass node, and a first biquad low pass node; a second biquad circuit including a second input node connected to the first biquad low pass node, a second biquad band pass node, and a second biquad low pass node; a first summing circuit summing an output of the second biquad band pass node and an output of the second biquad low pass node; a second summing circuit subtracting an output of the first biquad low pass node from output of the first summing circuit and amplifying the summed result by a constant; and a third summing circuit summing up the output of the second summing circuit and the output of the second biquad low pass node, wherein the first and second biquad circuits are Gm-C biquad circuits having transconductors connected in a self-feedback configuration to the first and second biquad band pass nodes, respectively.