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Apparatus and method for frequency translation in a communication device

  • US 5,801,654 A
  • Filed: 03/20/1995
  • Issued: 09/01/1998
  • Est. Priority Date: 06/21/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus for converting a baseband modulated in phase (I) component, and a baseband modulated quadrature (Q) component to an intermediate frequency (IF) signal, the apparatus comprising:

  • a controller, having an input for receiving a clock signal with a predetermined clock cycle rate, operable for outputting a first and a second predetermined control signal based on a predetermined number of clock cycles;

    a first multiplying digital to analog conversion (MDAC) unit receiving the first predetermined control signal and the baseband modulated I component, being operable for stepping the baseband modulated I component by a stepped sinewave having predetermined step sizes to output a sinewave modulated I signal based on the first predetermined control signal;

    a second MDAC unit receiving the second predetermined control signal and the baseband modulated Q component, being operable for stepping the baseband modulated Q component by a stepped cosinewave having predetermined step sizes to output a cosinewave modulated Q signal based on the second predetermined control signal; and

    a summing unit receiving the first and the second MDAC output signals and being operable for summing the output signals to form the IF signal.

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