Reconfigurable RF Amplifier Bias Feedback for Wider Dynamic Range
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Solution Overview
Problem
Radio frequency amplifiers face challenges in maintaining a wide output dynamic range due to signal distortion caused by various environments, including internal and external interfering signals, antenna impedance changes, and changing ambient temperatures.
Innovation Solution
A reconfigurable amplifier with a distortion detection network and bias controller that uses artificial intelligence/machine learning to dynamically adjust bias signals based on distortion detection, reducing RF signal distortion and increasing dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional radio frequency amplifiers operate in challenging environments, then they experience signal distortion, but output dynamic range is limited
Solution Approach 1:
The patent implements a feedback mechanism where a distortion detection network continuously monitors the RF signal output for distortion products. The detected distortion information is fed back to a bias controller that dynamically adjusts the amplifier bias signals to minimize distortion. This closed-loop feedback system enables the amplifier to maintain high reliability and wide output dynamic range by actively compensating for distortion caused by challenging environments.
Solution Approach 2:
The patent dynamically changes the bias parameters of the amplifier based on detected distortion levels. The bias controller adjusts bias voltages or currents in response to distortion detection signals, thereby changing the operating parameters of the amplifier to optimize performance. This parameter adjustment allows the amplifier to adapt to varying environmental conditions and maintain wide output dynamic range.
2Object-affected harmful factors
If amplifier bias is fixed, then circuit simplicity is maintained, but distortion increases in varying environments
Solution Approach 1:
The feedback mechanism introduces distortion detection and automatic bias adjustment capabilities that were previously absent. The distortion detection network, bias controller, and associated circuitry add complexity to the amplifier design. However, this added complexity is necessary to achieve low distortion performance in varying environments, as fixed bias circuits cannot adapt to environmental changes.
Solution Approach 2:
The amplifier system performs self-adjustment through the automatic bias control mechanism. The distortion detection network monitors output distortion, and the bias controller automatically adjusts bias signals without external intervention. This self-service capability reduces the need for manual tuning and external calibration, though the underlying circuit complexity remains to enable this autonomous operation.
3Reliability
If dynamic bias adjustment is implemented, then distortion is reduced, but device complexity increases
Solution Approach 1:
The dynamic bias adjustment is achieved through a feedback loop that connects the distortion detection network to the bias controller. The control circuit complexity arises from implementing this feedback mechanism, which includes distortion product detection, signal processing, and bias signal generation. The feedback system enables high linearity by continuously optimizing bias conditions based on actual distortion measurements.
Solution Approach 2:
The patent replaces manual or mechanical bias adjustment mechanisms with an electronic control system. Instead of physical bias tuning or fixed resistor networks, the system uses electronic bias controllers that dynamically adjust bias signals based on distortion detection. This substitution enables precise, adaptive bias control for improved linearity, though it increases electronic circuit complexity.
Data Source
AI summary
A reconfigurable amplifier configured to decrease radio frequency (RF) signal distortion and increase dynamic range is disclosed. The reconfigurable amplifier includes an amplifier having an RF signal input, an RF signal output, and a bias signal input. A distortion detection network has a detector input coupled to the RF signal output and a detector output, wherein the distortion detector network is configured to generate a detection signal that is proportional to distortion at the RF signal output. A bias controller has a detection signal input coupled to the detector output and a bias output coupled to the bias signal input.10 The bias controller is configured to generate a bias signal that dynamically shifts level at the bias output to reduce the distortion at the RF signal output in response to the detection signal.