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Dual conversion transmitter with single local oscillator

  • US 8,385,855 B2
  • Filed: 11/06/2009
  • Issued: 02/26/2013
  • Est. Priority Date: 11/07/2008
  • Status: Active Grant
First Claim
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1. A dual conversion transmitter, wherein the transmitter is configured to divide a first oscillator signal into a second oscillator signal and a third oscillator signal, wherein the transmitter is configured to perform frequency scaling such that the second and third oscillator signals have different frequencies from each other, the transmitter further comprising:

  • a first mixer, wherein the first mixer is configured to utilize the second oscillator signal to facilitate frequency conversion; and

    a second mixer, wherein the second mixer is configured to utilize the third oscillator signal to facilitate frequency conversion; and

    a filter configured to filter the output of the first mixer and to provide the output of the filter to the input of the second mixer;

    wherein the transmit frequency conversion is the result of one of;

    (i) the sum of an intermediate frequency (“

    IF”

    ) transmit signal frequency and the third oscillator signal frequency, and (ii) the difference of the IF transmit signal frequency and the third oscillator signal frequency.

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