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Apparatus and method for power ramp up of wireless modem transmitter

  • US 6,876,697 B2
  • Filed: 12/12/2000
  • Issued: 04/05/2005
  • Est. Priority Date: 12/12/2000
  • Status: Expired due to Fees
First Claim
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1. A wireless modem, comprising:

  • a direct current (DC) bias voltage;

    a constant amplitude waveform source to provide a constant amplitude waveform a variable amplitude waveform source to provide a first variable amplitude waveform and a second variable amplitude waveform;

    an In-phase/Quadrature (I/Q) modulator including an input, a gain control and an output, the input of the I/Q modulator being coupled in common with each of the constant amplitude waveform and the DC bias voltage, the gain control of the I/Q modulator coupled with the first variable amplitude waveform, wherein the first variable amplitude waveform provides a first control voltage to bias the output of the I/Q modulator;

    a power amplifier (PA) including an input, a gain control and an output, the input of the PA coupled with the output of the I/Q modulator, the gain control of the PA coupled with the second variable amplitude waveform, wherein the second variable amplitude waveform provides a second control voltage to bias the output of the PA; and

    a transmitting antenna coupled with the output of the PA, wherein the constant amplitude waveform source is configured to provide the constant amplitude waveform at device power-up to thereby bias said I/Q modulator to maximum gain, and wherein the variable amplitude waveform source is configured to provide a ramp-up waveform at device start-up to thereby reach a saturation region of the power amplifier.

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