Amplifier Gain Control for Combined Over-Voltage and Over-Current Protection
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Solution Overview
Problem
Existing wireless communication devices face challenges in protecting radio frequency front end (RFFE) components from over-voltage and over-current conditions, particularly during high-stress scenarios where individual over-voltage or over-current protection mechanisms are insufficient to prevent damage.
Innovation Solution
A combined over-voltage and over-current protection system that adjusts amplifier gain by using AND logic to trigger protection thresholds, incorporating current and voltage sensors to detect both conditions simultaneously, and adjusts gain through input signal attenuation or bias current adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual over-voltage or over-current protection mechanisms are used, then protection is provided under normal conditions, but protection is insufficient during high-stress scenarios where both conditions occur simultaneously
Solution Approach 1:
The patent combines over-voltage and over-current protection mechanisms into a unified protection system that uses logical operations (OR gate for individual protections, AND gate for combined protection) to determine when to adjust amplifier gain. This merging approach ensures comprehensive protection during high-stress scenarios while maintaining manageable system complexity through structured logical control.
Solution Approach 2:
The protection system dynamically adjusts amplifier gain based on real-time monitoring of voltage and current conditions. The system transitions between different protection modes (individual over-voltage protection, individual over-current protection, or combined protection) depending on the operational stress level, making the protection effectiveness adaptive to changing conditions.
2Reliability
If amplifier gain is adjusted to protect RFFE components, then component safety is ensured, but signal amplification performance may be degraded
Solution Approach 1:
The protection system applies partial gain adjustment rather than complete signal blocking. By adjusting the amplifier gain to a reduced level rather than shutting down completely, the system provides component protection while maintaining partial signal amplification performance, allowing continued operation at reduced capacity during over-stress conditions.
Solution Approach 2:
The system continuously monitors voltage and current conditions and provides feedback to dynamically adjust amplifier gain. This closed-loop feedback mechanism ensures that gain adjustment is applied only when and to the extent necessary for protection, minimizing performance degradation while maintaining component safety.
Data Source
AI summary
Certain aspects of the present disclosure generally relate to electronic circuits and, more particularly, to techniques and apparatus for signal amplification. One example apparatus generally includes: a current sensor configured to sense a current associated with an amplifier; and a voltage sensor configured to sense a voltage associated with the amplifier. The apparatus may also include a logic circuit configured to: detect a first over-current condition associated with the amplifier based on the current; detect a first over-voltage condition associated with the amplifier based on the voltage; and adjust an amplification gain to yield a first adjusted gain level for an input signal based on detection of the first over-current condition and the first over-voltage condition, wherein the amplifier is configured to amplify the input signal based on the first adjusted gain level.