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Envelope tracking current bias circuit with offset removal function and power amplifier

  • US 10,270,395 B2
  • Filed: 01/19/2018
  • Issued: 04/23/2019
  • Est. Priority Date: 07/18/2017
  • Status: Active Grant
First Claim
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1. An envelope tracking (ET) current bias circuit, comprising:

  • an envelope detection circuit configured to detect an ET voltage from an input signal;

    a first voltage/current converting circuit configured to convert a reference voltage into a direct current (DC) current and adjust the DC current according to a first control signal;

    a second voltage/current converting circuit configured to convert the ET voltage into an ET current, adjust the ET current according to a second control signal, and remove a DC offset current from the ET current to provide an offset compensated ET current; and

    an arithmetic circuit configured to calculate levels of the offset compensated ET current and the DC current to generate an ET bias current.

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