Patent ID: 8504601

Claim:
A method of designing a finite impulse response filter having a desired frequency response and a differential output having a first output signal and a complement output signal, comprising: determining a set of N Fourier coefficients that result in the desired impulse response; calculating a set of N impedance values that correspond to the determined Fourier coefficients; scaling the calculated impedance values to a desired range; constructing an inverting delay line comprised of N inverting delay elements; connecting impedance devices having the scaled impedance values to the delay line, one after each delay element in the order of the Fourier coefficients to which the impedance values correspond; determining which impedance devices should contribute to the first output signal and which impedance devices should contribute to the complement output signal; and connecting the impedance devices which should contribute to the first output signal to a first output terminal and the impedance devices which should contribute to the complement output signal to the second output terminal.