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Amplifier dynamic bias adjustment for envelope tracking

  • US 9,413,298 B2
  • Filed: 03/14/2013
  • Issued: 08/09/2016
  • Est. Priority Date: 12/28/2012
  • Status: Active Grant
First Claim
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1. A circuital arrangement comprising:

  • an amplifier comprising;

    stacked transistors having a plurality of gate terminals configured to operatively provide a plurality of dynamic bias voltages or currents to the stacked transistors;

    an input port operatively connected to a gate terminal of an input transistor of the stacked transistors;

    an output port operatively connected to a drain terminal of an output transistor of the stacked transistors; and

    a reference terminal operatively coupling the input transistor to a reference potential,wherein;

    the stacked transistors comprise two subsets of transistors operatively arranged in series, a first subset comprising the input transistor operatively connected between the reference potential at the reference terminal and a second subset, the second subset comprising one or more transistors operatively connected in series with each other, at least one transistor of the one or more transistors being the output transistor, the second subset operatively connected between the first subset and a variable output supply bias voltage or current provided to a drain terminal of the output transistor,the variable output supply bias voltage or current is operatively generated from an envelope signal of an input signal, andat least one of the plurality of the dynamic bias voltages or currents is operatively generated from the envelope signal of the input signal using a gate modifier function, wherein the gate modifier function comprises at least one of;

    a) a scaling function, b) an amplitude shifting function, c) a phase shifting function, and d) an inverting function.

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