Back to results
US 11,770,107 B2Granted
Load-adaptive power amplifier
AssigneeQUALCOMM Incorporated
InventorsWai Lim Ngai, Jeremy Darren Dunworth
Life of this patent
Estimating the term…
Abstract
Certain aspects of the present disclosure provide an amplification system. The amplification system generally includes: a first amplifier having an output coupled to an output of the amplification system; a second amplifier, inputs of the first amplifier and the second amplifier being coupled to an input of the amplification system; an impedance coupled to an output of the second amplifier; and a biasing circuit having a first voltage sense input coupled to the output of the first amplifier, a second voltage sense input coupled to the output of the second amplifier, and an output coupled to a bias input of the first amplifier.
Claims32
An amplification system comprising:
- a first amplifier having an output coupled to an output of the amplification system;
- a second amplifier, inputs of the first amplifier and the second amplifier being coupled to an input of the amplification system;
- an impedance coupled to an output of the second amplifier;
- and
- a biasing circuit having a first voltage sense input coupled to the output of the first amplifier, a second voltage sense input coupled to the output of the second amplifier, and an output coupled to a bias input of the first amplifier, the biasing circuit comprising a load adaptive bias circuit configured to:
- determine a difference between output voltage swings of the first amplifier and the second amplifier;
- and
- bias the first amplifier based on the difference, wherein the load adaptive bias circuit is configured to bias the first amplifier by:
- decreasing a bias voltage of the first amplifier when the output voltage swing of the first amplifier is larger than the output voltage swing of the second amplifier;
- and
- increasing the bias voltage when the output voltage swing of the first amplifier is smaller than the output voltage swing of the second amplifier.
8 more elements
A method for signal amplification, comprising:
- determining a difference between output voltage swings of a first amplifier and a second amplifier, wherein the first amplifier comprises an output coupled to an output node and wherein the second amplifier comprises an output coupled to an impedance, inputs of the first amplifier and the second amplifier being coupled to an input node;
- and
- biasing the first amplifier based on the difference between the output voltage swings, wherein biasing the first amplifier comprises:
- decreasing a bias voltage of the first amplifier when the output voltage swing of the first amplifier is larger than the output voltage swing of the second amplifier;
- and
- increasing the bias voltage when the output voltage swing of the first amplifier is smaller than the output voltage swing of the second amplifier.
3 more elements
An apparatus for signal amplification, comprising:
- means for determining a difference between output voltage swings of a first amplifier and a second amplifier, wherein the first amplifier comprises an output coupled to an output node and wherein the second amplifier comprises an output coupled to an impedance, inputs of the first amplifier and the second amplifier being coupled to an input node, wherein the means for determining the difference between output voltage swings comprises means for determining a first average voltage associated with the output voltage swing of the first amplifier and means for determining a second average voltage associated with the output voltage swing of the second amplifier;
- and
- means for biasing the first amplifier based on the difference between the output voltage swings.
An amplification system comprising:
- a first amplifier having an output coupled to an output of the amplification system;
- a second amplifier that is replica of the first amplifier, a size of the second amplifier being smaller than a size of the first amplifier, inputs of the first amplifier and the second amplifier being coupled to an input of the amplification system;
- an impedance coupled to an output of the second amplifier;
- and
- a biasing circuit having a first voltage sense input coupled to the output of the first amplifier, a second voltage sense input coupled to the output of the second amplifier, and an output coupled to a bias input of the first amplifier, the biasing circuit comprising:
- a first average voltage detector coupled between the first voltage sense input and the output of the biasing circuit;
- and
- a second average voltage detector coupled between the second voltage sense input and the output of the biasing circuit.
5 more elements
An amplification system comprising:
- a first amplifier having an output coupled to an output of the amplification system;
- a second amplifier, inputs of the first amplifier and the second amplifier being coupled to an input of the amplification system;
- an impedance coupled to an output of the second amplifier;
- and
- a biasing circuit having a first voltage sense input coupled to the output of the first amplifier, a second voltage sense input coupled to the output of the second amplifier, and an output coupled to a bias input of the first amplifier, wherein the biasing circuit is configured to bias the first amplifier such that variations in an output voltage swing of the first amplifier due to changes in a load impedance coupled to the output of the first amplifier are reduced.
2 more elements
Dependencies are inferred from the claim text.