Patent ID: 7656977

Claim:
A frequency domain equalizer system, comprising: a transmit driver; a receiver decision circuit communicatively coupled to the transmit driver, the receiver decision circuit having a receiver decision circuit input signal and a receiver decision circuit output signal; an all-pass filter communicatively coupled to the transmit driver and the receiver decision circuit, the all-pass filter having an all-pass input signal; a first band-pass filter, a second band-pass filter, a third band-pass filter, and a fourth band-pass filter, the first band-pass filter and the third band-pass filter each acting upon the receiver decision circuit input signal and the second and the fourth band-pass filter each acting upon the receiver decision circuit output signal; and a first summing circuit and a second summing circuit, the first summing circuit configured for summation of a first band-pass filter output signal and a second band-pass filter output signal, the second summing circuit configured for summation of a third band-pass filter output signal and a fourth band-pass filter output signal, wherein the all-pass filter input signal comprises a first integration of a first summation by the first summing circuit and a second integration of a second summation by the second summing circuit, and at least one of a first rise time or a first duty cycle of the transmit driver is approximately equivalent to at least one of a second rise time or a second duty cycle of the receiver decision circuit.