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Integrated frequency translation and selectivity

DC CAFC
  • US 6,049,706 A
  • Filed: 10/21/1998
  • Issued: 04/11/2000
  • Est. Priority Date: 10/21/1998
  • Status: Expired due to Term
First Claim
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1. 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.

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