Programmable Filter Compensation for Transmit Power Tracking Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing transmit power measurement systems in mobile communication devices face errors due to gain asymmetry in the transmit power detection path, which affects accuracy across various conditions and protocols like 3G and 4G wireless communication.
Innovation Solution
A transmit power measurement apparatus with a programmable filter device and compensation controller that learns and adjusts the frequency response of the transmit power detection path to mitigate power measurement errors, ensuring accurate power control across different gain settings and bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a transmit power detection path with analog components is used, then the system can measure transmit power, but gain asymmetry causes measurement errors that vary with frequency and temperature
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the frequency response of the detection path using a programmable filter. The filter compensates for gain asymmetry by modifying the frequency response parameters based on detected temperature and gain settings, thereby maintaining measurement accuracy across varying conditions without changing the physical hardware configuration.
Solution Approach 2:
The patent implements feedback by continuously monitoring temperature and gain settings, then using this information to adjust the filter configuration in real-time. This closed-loop feedback mechanism ensures that the detection path compensates for its own asymmetry variations, maintaining reliable measurements despite environmental changes.
2Adaptability or versatility
If the gain setting of the transmit power detection path is adjusted, then the measurement range is expanded, but the frequency response becomes more asymmetrical causing larger measurement errors
Solution Approach 1:
The patent applies dynamics by making the filter configuration adaptive rather than fixed. The programmable filter dynamically adjusts its frequency response characteristics based on the current gain setting and temperature, allowing the system to maintain measurement accuracy across different operating conditions while preserving the expanded measurement range provided by variable gain settings.
Solution Approach 2:
The patent changes the filter parameters (frequency response characteristics) based on the gain setting and temperature conditions. This allows the system to optimize measurement accuracy for each specific operating point while maintaining the ability to measure across a wide power range through gain adjustment.
3Measurement precision
If temperature compensation is implemented, then measurement accuracy under temperature variation is improved, but the device complexity increases due to additional sensing and control circuits
Solution Approach 1:
The patent applies universality by designing the programmable filter to serve multiple functions: it compensates for both frequency response asymmetry and temperature-induced variations. This multi-functional approach achieves temperature compensation without requiring separate dedicated compensation circuits, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the temperature compensation function with the existing filter structure in the detection path. By integrating temperature compensation into the filter's frequency response adjustment capability rather than adding separate compensation hardware, the system achieves improved temperature stability while minimizing additional circuit complexity.
Data Source
AI summary
A transmit power measurement apparatus includes a transmit power detection path, a compensation circuit and a tracking circuit. The compensation circuit includes a programmable filter device and a compensation controller. The programmable filter device generates a filter output. The compensation controller sets the programmable filter device at least based on a frequency response of the transmit power detection path. The tracking circuit generates a transmit power tracking result at least based on the filter output.