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Low current direct conversion transmitter architecture

  • US 7,664,520 B2
  • Filed: 06/24/2004
  • Issued: 02/16/2010
  • Est. Priority Date: 06/24/2004
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • determining a change in a radio frequency transmitter output power;

    varying, with a digital variable gain amplifier, a level of an input base band signal at an input of a digital to analog converter that outputs a signal to a radio frequency transmitter chain that comprises a phase modulator of the radio frequency transmitter, where the varying is according to the determined change in the radio frequency transmitter output power, comprising increasing the level of the signal as the radio frequency transmitter output power increases and decreasing the level of the signal as the radio frequency transmitter output power decreases; and

    adjusting a bias current of at least the phase modulator according to the varied level of the signal, comprising decreasing the bias current as the level of the signal is decreased and increasing the bias current as the level of the signal is increased.

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