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Programmable transmitter architecture for non-constant and constant envelope modulation

  • US 7,672,645 B2
  • Filed: 06/15/2006
  • Issued: 03/02/2010
  • Est. Priority Date: 06/15/2006
  • Status: Active Grant
First Claim
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1. A programmable transmitter comprising:

  • a programmable frequency synthesizer adapted to generate a local oscillator carrier frequency;

    a plurality of transmitter components;

    a microcontroller coupled to the frequency synthesizer and to the plurality of transmitter components;

    a digital baseband interface adapted to receive digital data to be transmitted; and

    a pulse-shaping filter coupled between the frequency synthesizer and the digital baseband interface;

    wherein the plurality of transmitter components includes;

    a digital-to-analog converter coupled to the digital baseband interface and adapted to receive the digital data and to convert the digital data into I and Q analog data signals; and

    a quadrature mixer coupled to the digital-to-analog converter and adapted to receive the I and Q analog data signals from the digital-to-analog converter, and also coupled to the frequency synthesizer and configured to receive the local oscillator carrier frequency from the frequency synthesizer, the quadrature mixer being configured to combine the local oscillator carrier frequency and the I and Q analog data signals to provide a radio frequency data signal from transmission;

    wherein the microcontroller is configured to provide a frequency control signal to the frequency synthesizer to control a frequency of the local oscillator carrier frequency,wherein the microcontroller is further configured to provide digital control signals to at least some of the plurality of transmitter components to turn on and off different ones of the plurality of transmitter components based on an operating mode of the transmitter, such that the transmitter can accommodate both constant envelope modulation and non-constant envelope modulation schemes; and

    wherein the microcontroller is configured to provide the digital control signals to the pulse-shaping filter to turn off the pulse-shaping filter.

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