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System and method for current-mode amplitude modulation

  • US 7,333,778 B2
  • Filed: 07/12/2004
  • Issued: 02/19/2008
  • Est. Priority Date: 03/21/2001
  • Status: Expired due to Term
First Claim
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1. A method of compensating operation of a transmitter that includes av RF power amplifier being provided a modulated supply current, the method comprising:

  • generating the modulated supply current as a scaled version of a modulated reference current by mirroring the modulated reference current via a current mirror circuit and configuring the current mirror circuit such that a reference voltage generated by the modulated reference current flowing into a reference load will substantially match an output voltage generated by the modulated supply current flowing into an effective DC resistance of the RF power amplifier for a nominal effective DC resistance of the RF power amplifier;

    detecting a change in the effective DC resistance of the RF power amplifier away from the nominal effective DC resistance of the RF power amplifier by detecting a voltage imbalance in the current mirror circuit; and

    compensating transmitter operation responsive to said detection.

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