Patent ID: 7970811

Claim:
A circuit of a continuous-time filter comprises: an input signal coupled to a forward transconductance element configured to multiply the input signal by a forward filter coefficient to convert the input signal to a filtered input current; a forward transimpedance element coupled to the forward transconductance element and configured to convert the filtered input current to a filtered voltage; a forward transmission delay line configured to have a transmission line delay element with a corresponding delay-time and coupled to the forward transimpedance element to delay the filtered voltage to a filtered output signal; a termination impedance coupled to an output of the forward transmission delay line and configured to terminate the forward transmission delay line; a feedback transconductance element coupled to the forward transmission delay line and configured to multiply the filtered output signal by a feedback filter coefficient to convert the filtered output signal to a feedback current; and an output of the feedback transconductance element coupled back to an input of the forward transimpedance to add the feedback current into the filtered input current.