×

Simplified high frequency tuner and tuning method

  • US 8,140,043 B2
  • Filed: 04/11/2011
  • Issued: 03/20/2012
  • Est. Priority Date: 09/13/1996
  • Status: Expired due to Fees
First Claim
Patent Images

1. A tuning device comprising:

  • (a) input circuitry that receives an RF signal containing a channel of interest from a channelized spectrum;

    (b) mixers and local oscillator signal generators configurable to produce I and Q signals in approximate quadrature relation by mixing the channel of interest with an approximately quadrature local oscillator signal having a frequency that is one of a set of local oscillator frequencies determined by the channel spacing; and

    (c) filter circuitry configurable to filter the I and Q signals to define a near-baseband passband determined by the bandwidth of the signal of interest and whose lower edge is situated near baseband but spaced from DC by at least about the channel spacing.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×