US 2014/0191808 A1Published application

Systems and methods for biasing amplifiers during high-power operation with adaptive closed-loop control

AssigneeAviat U.S., Inc.

InventorsFrank Matsumoto, Youming Qin, Andres Goytia, Cuong Nguyen

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Abstract

Various embodiments described herein provide systems and methods for improved performance for power amplifiers, particularly GaN power amplifiers. According to some embodiments, a power amplifier (e.g., GaN power amplifier) utilizes an adaptive closed-loop control of the drain current of the power amplifier to achieve improved performance for the power amplifier. Additionally, for some embodiments, use of the adaptive closed-loop control of the drain current of the power amplifier depends on the power region in which the power amplifier is operating (e.g., depends on the radio frequency power region).

Claims27

Dependent claims

A method comprising:

determining whether a power amplifier is operating in a low-power mode or a high-power mode, the power amplifier having an input signal, an output signal, and a drain current;
if the power amplifier is operating in the high-power mode, setting the power amplifier to operate in the low-power mode, applying a first closed-loop control of the drain current while the power amplifier is operating in the low-power mode, and maintaining the drain current as determined by the first closed-loop control while adjusting a voltage of the input signal of the power amplifier to reach a desired power level for the output signal of the power amplifier;
and
if the power amplifier is operating in the low-power mode, applying a second closed-loop control of the drain current according to the desired power level for the output signal of the power amplifier.

1 more element

A method comprising:

determining whether a power amplifier is operating in a low-power mode or a high-power mode, the power amplifier having an input signal, an output signal, and a drain current;
if the power amplifier is operating in the high-power mode:
setting the power amplifier to operate in the low-power mode,
obtaining from calibrated drain current data a first calibrated drain current value associated with a first present operational parameter of the power amplifier and a first present power level of the output signal of the power amplifier,
determining whether a result of comparing a first present drain current value of the drain current to the first calibrated drain current value satisfies a first threshold condition,
adjusting a voltage of the input signal of the power amplifier to reach a desired power level for the output signal of the power amplifier if the first threshold condition is not satisfied, and
if the first threshold condition is satisfied, adaptively controlling power of the power amplifier and adjusting the drain current based on a second calibrated drain current value associated with a second present operational parameter of the power amplifier and a second present power level of the output signal of the power amplifier;
and
if the power amplifier is operating in the low-power mode:
obtaining from the calibrated drain current data a third calibrated drain current value based on a third present operational parameter of the power amplifier and a third present power level of the output signal of the power amplifier,
determining whether a result of comparing a second present drain current value of the drain current to the third calibrated drain current value satisfies a second threshold condition, and
if the second threshold condition is satisfied, adaptively controlling power of the power amplifier and adjusting the drain current based on a fourth calibrated drain current value associated with a fourth present operational parameter of the power amplifier and a third present power level of the output signal of the power amplifier.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/184,282Filed 19 Feb 2014
Priority: 8 Jan 2013
Published: 10 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H03F 3/21
Power amplifiers, e.g. Class B amplifiers, Class C amplifiers: with semiconductor devices only
H03F 1/0261
In transistor amplifiers: with control of the polarisation voltage or current, e.g. gliding Class A
H03F 1/0272
With control of the polarisation voltage or current, e.g. gliding Class A: by using a signal derived from the output signal
H03F 1/3247
Using predistortion circuits: using feedback acting on predistortion circuits

Family

Application61/750,308Us provisional application · filed 8 Jan 2013
Application61/767,208Us provisional application · filed 20 Feb 2013
Application14/150,721Continuation in part · filed 8 Jan 2014
Application14/184,282Continuation in part
US 2014/0191807 A1Published application
US 9,059,666 B2Related patent
US 9,143,098 B2Related patent
US 2014/0191808 A1This patent

From the US filing history. Foreign family members aren’t listed.

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