Reconfigurable RF Amplifier Bias Control for Distortion Reduction
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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 a bias controller that dynamically adjusts bias signals in response to detected distortion, utilizing artificial intelligence and machine learning to minimize signal distortion and enhance dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radio frequency amplifiers operate in challenging environments, then they must handle various interfering signals and impedance changes, but signal distortion increases and output dynamic range decreases
Solution Approach 1:
The patent implements a feedback mechanism where a distortion detection network continuously monitors the RF signal output for distortion products. When distortion is detected, the system generates a correction signal that is fed back to the bias controller, which then adjusts the amplifier bias to minimize the distortion. This closed-loop feedback system enables the amplifier to automatically compensate for environmental changes and maintaining low distortion across varying operating conditions.
Solution Approach 2:
The patent employs dynamic bias adjustment where the amplifier bias points are not fixed but continuously varied in response to detected distortion levels. The bias controller dynamically shifts bias levels based on real-time distortion measurements, allowing the amplifier to adapt its operating characteristics to maintain optimal performance across different environmental conditions, power levels, and signal scenarios.
2Power
If radio frequency amplifiers operate at high power levels, then output power increases, but signal distortion increases and dynamic range decreases
Solution Approach 1:
The patent applies preliminary action by proactively detecting distortion products before they significantly degrade signal quality. The distortion detection network continuously monitors for early signs of distortion, and the bias controller preemptively adjusts bias conditions to prevent distortion from escalating. This proactive approach allows the amplifier to maintain clean signal output even at high power levels by addressing distortion issues before they become problematic.
3Device complexity
If traditional amplifiers are used without distortion correction, then device complexity remains low, but output dynamic range is limited by distortion
Solution Approach 1:
The patent introduces intermediary components between the amplifier and the output: a distortion detection network that acts as a sensor to measure distortion products, and a bias controller that serves as an actuator to adjust bias conditions. These intermediary elements form a control loop that enhances amplifier reliability and output dynamic range without requiring fundamental changes to the core amplifier architecture, thus achieving improved performance with moderate complexity increase.
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. 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.