Dynamic biasing system for an amplifier
AssigneeSkyworks Solutions, Inc.
InventorNicolas Constantin
Life of this patent
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Abstract
A dynamic biasing system (“DBS”) for dynamically biasing an amplifier with an adjusted bias signal is shown. The DBS may include a first biasing circuit that produces a bias signal and a second biasing circuit in signal communication with both the first biasing circuit and the amplifier, wherein the second biasing circuit compares the bias signal to a predetermined threshold and in response produces the adjusted bias signal.
Claims16
A dynamic biasing system (“DBS”) for dynamically biasing an amplifier with an adjusted bias signal, the DBS comprising:
- a first biasing circuit that produces a bias signal independently of an external detection circuit wherein the first biasing circuit correlates the bias signal with an envelope of a radio frequency (“RF”) input signal to the amplifier;
- a second biasing circuit in signal communication with both the first biasing circuit and the amplifier, wherein the second biasing circuit compares the bias signal to a predetermined threshold and in response produces the adjusted bias signal, wherein the second biasing circuit includes:
- a comparator that compares the bias signal to the predetermined threshold;
- circuitry configured to increase the bias signal when the bias signal equals or exceeds the predetermined threshold;
- and
- circuitry configured to disable the adjusted bias signal when the bias signal is less than the predetermined threshold.
A dynamic biasing system (“DBS”) for dynamically biasing an amplifier with an adjusted bias signal, the DBS comprising:
- a first biasing circuit that produces a bias signal independently of an external detection circuit;
- a second biasing circuit in signal communication with both the first biasing circuit and the amplifier, wherein the second biasing circuit includes means for comparing the bias signal to a predetermined threshold and in response producing the adjusted bias signal, wherein the second biasing circuit includes:
- means for comparing the bias signal to the predetermined threshold;
- and
- means for increasing the bias signal when the bias signal equals or exceeds the predetermined threshold;
- and
- means for disabling the adjusted bias signal when the bias signal is less than the predetermined threshold.
A method for dynamically biasing a power amplifier, comprising:
- providing a bias signal that is produced independently of an external detection circuit to a control input of a transistor in the power amplifier, wherein the bias signal is correlated with an envelope of a radio frequency (RF) input signal;
- comparing the bias signal to a predetermined threshold;
- increasing the bias signal when the bias signal equals or exceeds the predetermined threshold;
- and
- disabling the increased bias signal when the bias signal is less than the predetermined threshold.
Dependencies are inferred from the claim text.