Patent ID: 6909886

Claim:
A filter circuit, comprising: a first circuit component operable to propagate a first input current signal, a second input current signal, a third input current signal, and a fourth input current signal, wherein the third and fourth input current signals are substantially one-hundred-eighty degrees out of phase with the first and second input current signals; a polyphase filter operable to: receive the first, second, third, and fourth input current signals; generate a first output current signal; generate a second output current signal that is substantially ninety degrees out of phase with the first output current signal; generate a third output current signal that is substantially one-hundred-eighty degrees out of phase with the first output current signal; and generate a fourth output current signal that is substantially two-hundred-seventy degrees out of phase with the first output current signal; and a second circuit component operable to: generate a first output signal using the first output current signal and the third output current signal, wherein the first output signal is at a first phase; and generate a second output signal using the second output current signal and the fourth output current signal, wherein the second output signal is at a second phase that is substantially ninety degrees out of phase with the first phase.