RF Log-Amp Detector Gain Switching for Low-Power Accuracy
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Solution Overview
Problem
Wireless devices face challenges in reducing power consumption of RF log-amp detectors, which affects battery life due to high power usage.
Innovation Solution
An RF log-amp detector with a pre-amplifier and limiters of variable gain, where the pre-amplifier gain is set to minimum and dynamic range is expanded by modifying limiter gains for coarse measurements, followed by adjusting pre-amplification levels for accurate fine measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gain of the preamplifier is set to its minimum and the dynamic range is expanded by modifying the amplification gain of the plurality of limiters, then the dynamic range is increased, but the measurement accuracy is reduced
Solution Approach 1:
The measurement process is divided into two distinct stages: a first measurement phase where limiters operate at maximum gain to capture coarse power level information across an expanded dynamic range, and a second measurement phase where the preamplifier gain is adjusted based on the coarse measurement to optimize accuracy for the final reading. This segmentation allows the system to benefit from both wide dynamic range and high measurement accuracy.
Solution Approach 2:
The system performs a preliminary coarse measurement using the limiters at maximum gain to determine the approximate power level. Based on this preliminary information, the preamplifier gain is then optimized before performing the final accurate measurement. This preliminary action enables the system to adapt its measurement strategy to the actual signal conditions.
2Measurement precision
If the RF log-amp detector operates continuously with high gain to maintain accuracy, then the measurement accuracy is preserved, but the power consumption increases
Solution Approach 1:
The system dynamically adjusts the preamplifier gain based on the coarse measurement results rather than operating at fixed high gain continuously. The gain is optimized adaptively for each measurement cycle based on the actual signal power level, allowing the system to consume less power while maintaining measurement accuracy across different signal conditions.
Solution Approach 2:
The preamplifier gain parameter is changed dynamically based on the coarse measurement outcome. By adjusting this parameter adaptively rather than maintaining it at a fixed high value, the system reduces power consumption while ensuring that the final measurement is performed with optimal accuracy for the given signal conditions.
Data Source
AI summary
An embodiment of the present invention provides an RF log-amp detector, comprising a pre-amplifer at the input of the RF log-amp detector, a plurality of limiters with variable gain connected to the pre-amplifier, wherein the gain of the preamplifier is set to its minimum and the dynamic range is expanded by modifying the amplification gain of the plurality of limiters, thereby increasing the dynamic range and reducing accuracy, after which a coarse measurement of a power level is taken and wherein the RF log-amp detector then defines which pre-amplification level is required based on the course measurement to bring the signal at the output of the preamp within an optimum dynamic range of the log-amp and wherein the pre-amplification gain is then set while the gain of the plurality of limiters are set to their minimum value with the RF log-amp then performing a second measurement with higher accuracy and calculating the final measurement from fine measurements and the pre-amplification gain.