Patent ID: 6049706
Filing Date: 2000-04-11
Classification: H03D,H04B

Abstract:
An apparatus for filtering and down-converting, comprising:(1) a frequency translator, comprising a down-convert and delay module to under-sample an input signal to produce an input sample of a down-converted image of said input signal, and to delay said input sample; and(2) a filter, comprising:(a) at least a portion of said down-convert and delay module;(b) at least one delay module to delay instances of an output signal; and(c) an adder to combine at least said delayed input sample with at least one of said delayed instances of said output signal to generate an instance of said output signal;wherein said down-convert and delay module under-samples said input signal according to a control signal, wherein a frequency of said control signal is equal to a frequency of said input signal plus or minus a frequency of said down-converted image, divided by n, where n represents a harmonic or sub-harmonic of said input signal.