Patent ID: 7468957

Claim:
A canceller circuit comprising: a subtractor, receiving an analog received signal and a replica signal of noise, for carrying out subtraction on the received signal and the replica signal in a continuous time analog domain; an analog-to-digital converter for converting an analog signal output from said subtractor to a digital signal; an adaptive filter, receiving a noise reference signal and an output signal of said analog-to-digital converter, for outputting the replica signal, as a digital signal; a digital-to-analog converter for receiving and converting a digital signal output from said adaptive filter, to an analog signal, and for supplying the analog signal to said subtractor as said replica signal; and a control circuit for variably controlling the sampling phase in said digital-to-analog converter independently of the sampling phase on the side of said analog-to-digital converter, the phase of the signal waveform of the replica signal, output from said digital-to-analog converter, being controlled by said control circuit to be coincident with the phase of said noise received.