Power Detector Gain Calibration for Linear Wide-Range Detection
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Solution Overview
Problem
Existing power detector circuits are oversaturated or have a small detection power range, making them unsuitable for various communication applications due to variations in environmental conditions and antenna impedance.
Innovation Solution
A power detector device comprising a power detector circuit, filter circuit, and calibration circuitry that adjusts gain to calibrate the detection power range, ensuring linearity by combining signal strength information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the power detector circuit uses a fixed gain configuration, then the circuit structure is simple, but the detection power range is limited and becomes oversaturated at higher output powers
Solution Approach 1:
The patent implements dynamic gain adjustment by introducing a calibration circuitry that automatically adjusts the gain of the power detector circuit based on the detected signal strength. This transforms the fixed gain configuration into a dynamic one, allowing the circuit to adapt to different output power levels and expand the detection power range without oversaturation.
Solution Approach 2:
The patent changes the gain parameter of the power detector circuit from a fixed value to a variable parameter that can be adjusted through calibration. By modifying the gain parameter dynamically based on signal conditions, the system achieves both simplicity and adaptability in the detection power range.
2Measurement precision
If the power detector circuit uses a single gain setting, then the detection accuracy is maintained within a narrow range, but the linearity is poor across a wide power range
Solution Approach 1:
The patent segments the detection power range into multiple sub-ranges, each optimized for a specific gain setting. The calibration circuitry automatically selects the appropriate gain segment based on the input signal strength, ensuring high detection accuracy within each segment while maintaining overall linearity across the entire power range.
Solution Approach 2:
The patent implements dynamic gain switching that adjusts the detector circuit's operating point based on the input signal level. This dynamic adaptation allows the system to maintain both high measurement precision and good linearity across a wide power range by operating in different linear regions as needed.
3Measurement precision
If the power detector circuit operates at high gain to detect weak signals, then weak signal detection is improved, but the circuit becomes oversaturated when detecting strong signals
Solution Approach 1:
The patent implements automatic gain control through calibration circuitry that dynamically adjusts the gain setting based on the detected signal strength. When weak signals are detected, the circuit operates at high gain for precise measurement; when strong signals are detected, the gain is reduced to prevent oversaturation, ensuring reliable operation across all signal levels.
Solution Approach 2:
The patent introduces a feedback mechanism where the calibration circuitry continuously monitors the output of the power detector circuit and adjusts the gain accordingly. This feedback loop prevents oversaturation by reducing gain when the output approaches saturation levels, while maintaining high sensitivity for weak signals through elevated gain when needed.
Data Source
AI summary
A power detector device includes a power detector circuit, a filter circuit, and a calibration circuitry. The power detector circuit is configured to detect a first signal to generate a second signal. The filter circuit is configured to filter the second signal to generate a third signal. The calibration circuitry is configured to determine first signal strength information in response to the third signal, adjust a gain of the power detector circuit to obtain second signal strength information, and combine the first signal strength information and the second signal strength information, in order to calibrate a detection power range of the power detector circuit to be linear.