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Simplified high frequency tuner and tuning method

  • US 7,860,482 B2
  • Filed: 11/09/2009
  • Issued: 12/28/2010
  • Est. Priority Date: 09/13/1996
  • Status: Expired due to Fees
First Claim
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1. A method of tuning a signal of interest from a channelized spectrum, comprising:

  • (a) splitting an incoming signal into two signal paths;

    (b) generating an approximately quadrature local oscillator signal;

    (c) quadrature mixing the split incoming signal with the local oscillator signal, thereby producing I and Q signals in approximate quadrature relation;

    (d) filtering the I signal with a first passband filter and filtering the Q signal with a second passband filter, wherein each filter defines a near-baseband passband, the lower edge of which is spaced from DC by at least about the passband width;

    (e) subjecting one of the filtered I and Q signals to a phase shift of about 90 degrees relative to the other, thereby producing second I and Q signals; and

    (f) summing the second I and Q signals, thereby producing a real-valued signal.

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