Shared-Detector RF Crest Factor Measurement Over Wide Dynamic Range
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Solution Overview
Problem
Conventional RF detectors face challenges in accurately measuring peak and average power levels of modulated RF signals due to part-to-part, process, and temperature variations, requiring complex and costly matching circuitry and dividers, and suffer from reduced dynamic range and frequency dependence.
Innovation Solution
A wide-dynamic range RF detector that uses a single detector array for both average and instantaneous/peak power detection, employing a feedback control loop to normalize instantaneous power to average power, eliminating the need for an accurate divider and simplifying the system by sharing components between detection channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If parallel processing with separate detectors is used for average and peak power measurement, then both power levels can be measured simultaneously, but part-to-part, process, and temperature variations between channels degrade measurement accuracy and increase system complexity
Solution Approach 1:
The patent combines the average power detection and peak power detection functions into a single integrated detector circuit. The detector simultaneously generates both average power output and peak power output from the same input signal path, eliminating the need for separate parallel detection channels and their associated matching circuitry. This merging approach resolves the technical contradiction by maintaining measurement accuracy while reducing device complexity.
Solution Approach 2:
The detector circuit is designed to perform multiple functions: it detects both average power and peak power levels, and can also provide crest factor measurement. By making the detector universal and multi-functional, the patent eliminates the need for separate specialized detectors for each measurement type, thereby reducing channel complexity while maintaining comprehensive measurement capabilities.
2Productivity
If an RF coupler is used to drive both detection channels in parallel processing, then simultaneous measurement is enabled, but the system requires additional components and matching circuitry that increases cost and complexity
Solution Approach 1:
The patent merges the detection functions into a single channel that processes the input signal once and generates both average and peak power measurements from that single processing path. This eliminates the need for an RF coupler to split the signal into multiple channels, thereby reducing system complexity and component count while maintaining the ability to provide comprehensive power measurement capabilities.
3Measurement precision
If conventional dividers are used to calculate crest factor from separate peak and average power measurements, then crest factor can be obtained, but the divider requires accurate handling of nonlinear calculations and adds to system complexity and cost
Solution Approach 1:
The patent extracts the crest factor measurement capability directly from the detector output without requiring a separate divider circuit. By providing normalized peak power output that is already scaled relative to average power, the detector eliminates the need for external division operations, thereby reducing processing circuit complexity while maintaining accurate crest factor measurement.
4Adaptability or versatility
If different detectors are used in average power and peak power channels, then specialized detection for each function is achieved, but component variations between channels require matching circuitry that increases complexity
Solution Approach 1:
The patent merges both detection functions into a single detector implementation, eliminating the need for multiple different detector types. This single detector handles both average and peak power detection using unified circuitry, thereby eliminating channel matching requirements while maintaining specialized detection capabilities for both power levels.
Data Source
AI summary
An RF detector configured to provide two outputs, one being a function of the true RMS power level of an RF input signal, and the other being a function of the instantaneous/peak power of the RF input signal, normalized to the average power level. The RF detector includes a variable gain detection subsystem including a single detector or detector array that provides a representation of the power level of the RF input signal. The detector or detector array is common to both the RMS power detection channel and the instantaneous/peak power detection channel of the RF detector. A method of RF detection includes providing representations of the RF input signal at different gain levels, selecting one or more of the representations, and averaging the selected signals. The gain levels of the selected representations is adjusted to provide information about the average power level of the RF input signal.