RF Power Detection Circuit for Fast Fault Detection and Accurate Measurement
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Solution Overview
Problem
Existing wireless communication devices face challenges in early detection of abnormalities in power amplifier output power and accurate measurement of output power, particularly in phased array antenna modules, due to limitations in error detection conditions and real-time performance when using reference voltage comparisons and analog-to-digital conversions.
Innovation Solution
A power detection circuit that outputs power detection results in both voltage and current forms, with a voltage comparison circuit for early detection and a digital signal indicating comparison results, along with a radio frequency integrated circuit that includes abnormality detection circuits for flexible error handling and real-time performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection result of the power detector is converted into a digital value by inputting it into an ADC, then accurate and precise measurement of the output power is achieved, but real-time performance deteriorates due to the time required for conversion
Solution Approach 1:
The power detection function is segmented into two parallel paths: one path uses an ADC for accurate digital measurement of output power, while the other path uses a voltage comparison circuit for rapid abnormality detection. This segmentation allows each path to be optimized for its specific function without compromising the other.
Solution Approach 2:
A voltage comparison circuit acts as an intermediary between the power detector and the abnormality detection system. This intermediary provides rapid comparison results for real-time abnormality detection while the ADC continues to provide accurate measurements, thus mediating between the conflicting requirements of speed and precision.
2Speed
If the detection result of the power detector is compared with a predetermined reference voltage for early abnormality detection, then real-time detection is achieved, but quantitative evaluation of output power cannot be performed
Solution Approach 1:
The detection system is divided into two functional segments: a voltage comparison circuit for rapid qualitative abnormality detection and an ADC path for accurate quantitative power measurement. Each segment handles a different aspect of the detection requirement.
Solution Approach 2:
The power detector is designed to provide multiple output types (voltage output for comparison and current output for ADC conversion), making it multi-functional. This allows the same detector to serve both rapid detection and precise measurement purposes through different output interfaces.
3Speed
If only the comparison result with respect to the reference voltage is used in feedback control of the amplification gain, then early abnormality detection is achieved, but various error detection conditions cannot be flexibly handled
Solution Approach 1:
The abnormality detection system is designed to accept multiple types of input signals (voltage comparison results and ADC digital values) and process them according to different detection conditions. This multi-functional design allows the system to adapt to various error detection scenarios including both rapid abnormality detection and precise quantitative evaluation.
Solution Approach 2:
The abnormality detection system dynamically selects and processes different types of detection results based on the specific detection conditions. It can switch between using voltage comparison results for rapid detection and ADC values for precise measurement, providing flexible adaptation to different operational requirements.
Data Source
AI summary
A power detection circuit includes a power detector that detects output power of a power amplifier and outputs in two ways of a voltage output and a current output as a detection result, and a voltage comparison circuit that compares the voltage output of the power detector with a predetermined reference voltage and outputs a power detection signal that is at a level "H" in a case where the voltage output is higher than the reference voltage and is at a level "L" in a case where the voltage output is lower than the reference voltage.