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Mobile communications device including an RF transmitter providing impedance fluctuation dampening and related methods

  • US 9,264,077 B2
  • Filed: 05/31/2012
  • Issued: 02/16/2016
  • Est. Priority Date: 05/31/2012
  • Status: Active Grant
First Claim
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1. A mobile communications device comprising:

  • a radio frequency (RF) signal source configured to generate RF signals over at least one RF frequency band;

    an RF transmitter coupled to the RF signal source and comprisingan RF amplifier configured to operate over a plurality of different power control levels, the RF amplifier having an input configured to receive the RF signals from the signal source and an output having an impedance which changes based upon changes between the different power control levels,a pass-band filter having an input coupled to the output of the RF amplifier and an output, anda shunt resistance network having a first terminal coupled to the output of the RF amplifier and the input of the pass-band filter, and a second terminal coupled to a voltage reference, wherein the shunt resistance network is configured to decrease a highest impedance change of the RF amplifier output to below a threshold impedance level, wherein the shunt resistance network is configured to maintain the RF amplifier output between a maximum power threshold and a minimum power threshold; and

    at least one antenna coupled to the output of the pass-band filter and configured to operate over the at least one RF frequency band.

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