Power Detector Forward Reverse Signal Throttling
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Solution Overview
Problem
Existing power detectors in mobile communication devices face challenges in efficiently managing forward and reverse power signals, leading to potential damage from overpower conditions and inefficiencies in dynamic range detection, particularly in varying signal levels and impedance mismatches between transmission components.
Innovation Solution
A power detector system that includes both forward and reverse power detection circuits, with a programmable threshold for the reverse detector to prevent premature throttling, and a combination of primary and boost detectors for high dynamic range detection with fast rise and fall times, allowing for accurate signal management and self-calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power detector is used to protect power amplifiers from overpower conditions, then reliability is improved, but device complexity increases due to the need for separate forward and reverse detection circuits
Solution Approach 1:
The patent combines forward and reverse power detection circuits into a single integrated power detector unit. The summing node merges the output currents from both forward and reverse detectors, creating a unified protection mechanism that maintains reliability while reducing device complexity through functional integration.
2Measurement precision
If a programmable threshold is implemented in the reverse detector, then measurement precision is improved for detecting reflected power, but device complexity increases
Solution Approach 1:
The patent implements a programmable threshold in the reverse detector that can be adjusted based on operating conditions. This allows the detection system to adapt its sensitivity and precision by changing the threshold parameter, enabling accurate measurement of reflected power while avoiding premature throttling in low-power conditions.
3Measurement precision
If a combination of primary and boost detectors is used for high dynamic range detection, then measurement precision is improved across varying signal levels, but device complexity increases
Solution Approach 1:
The patent divides the detection function into two specialized detectors: a primary detector for high signal levels and a boost detector for low signal levels. Each detector is optimized for its specific range, and their outputs are combined through the summing node. This segmentation allows high measurement precision across the entire dynamic range while keeping each individual detector circuit relatively simple.
4Productivity
If the reverse detector generates output only above a programmable threshold, then productivity is improved by avoiding premature throttling, but measurement precision may be reduced in low-power conditions
Solution Approach 1:
The patent converts the potential harm of detecting low-level reverse power (which could cause premature throttling) into a benefit by using a programmable threshold. The threshold filters out insignificant low-power conditions, allowing the system to maintain productivity by avoiding unnecessary throttling while still detecting genuine reflected power issues when they exceed the threshold level.
Data Source
AI summary
A power detector in a transmission path is disclosed. In one aspect, a power detector may be coupled to an output node for a transmission path. The power detector may be used to throttle a power amplifier to protect the power amplifier or other elements (e.g., an acoustic filter) from overpower conditions. The power detector may separately detect both a forward power signal as well as a reverse or reflected power signal (e.g., from an antenna). In a particularly contemplated aspect, the reverse detector only generates an output when the reverse signal exceeds a programmable threshold. This threshold allows the reverse signal to be ignored in low power conditions and helps avoid premature throttling.