RSSI Calibration Circuit Bias Adjustment
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Solution Overview
Problem
Existing methods for calibrating received signal strength indicators (RSSI) in wireless devices are inefficient and costly, as they rely on resistor trimming, which is laborious and only affects the measurement at a particular operating state, leading to inaccuracies due to environmental and component mismatch factors.
Innovation Solution
A calibration circuit with a comparison module, calculation module, and adjustable current source is used to derive a differential signal reflecting environmental influences, calculating a control signal to adjust the biasing signal, thereby improving the accuracy of RSSI measurements across various power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resistor trimming is used to calibrate RSSI, then the measurement accuracy at a particular operating state is improved, but the manufacturing complexity and cost increase due to laborious individual resistor formation or attachment
Solution Approach 1:
The patent replaces the mechanical/traditional resistor trimming process with an electronic calibration method using a calibration circuit that includes a capacitor, resistor, and control logic. The calibration circuit electronically adjusts the biasing signal to compensate for RSSI measurement errors without requiring physical resistor modification or attachment, thereby reducing manufacturing complexity while maintaining measurement accuracy
Solution Approach 2:
The patent changes the calibration approach by adjusting electrical parameters (biasing signal voltage levels) rather than modifying physical resistor values. The calibration circuit modifies the biasing signal parameter dynamically to compensate for environmental and process influences on RSSI measurement, eliminating the need for laborious resistor trimming while achieving accurate calibration across different operating states
2Measurement precision
If resistor trimming is used to calibrate RSSI, then the measurement accuracy is improved, but the productivity decreases due to laborious trimming process
Solution Approach 1:
The patent replaces the laborious mechanical resistor trimming process with an automated electronic calibration method. The calibration circuit uses control logic to automatically adjust the biasing signal based on stored calibration data, eliminating manual trimming operations and significantly improving calibration efficiency and productivity
Solution Approach 2:
The patent implements preliminary calibration by storing calibration data in memory before normal operation. The calibration circuit uses this pre-stored data to automatically adjust the biasing signal, eliminating the need for time-consuming real-time trimming operations and improving productivity while maintaining high measurement accuracy
3Measurement precision
If resistor trimming is used to calibrate RSSI, then the measurement accuracy at a specific operating state is improved, but the adaptability decreases because trimming only affects measurement at a particular operating state
Solution Approach 1:
The patent creates a universal calibration solution by using a calibration circuit that can adapt to multiple operating states. The circuit includes a capacitor and control logic that can adjust the biasing signal for different operating conditions, making the calibration effective across various power levels and environmental conditions rather than being limited to a single operating state
Solution Approach 2:
The patent introduces dynamic calibration capability where the biasing signal can be adjusted in real-time based on operating conditions. The calibration circuit dynamically modifies the biasing voltage to compensate for environmental and process influences at different operating states, providing adaptability and versatility rather than fixed trimming at a particular state
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a more accurate representation of received signal power levels by adjusting the biasing signal, reducing inaccuracies and enhancing the reliability of wireless device operations.
Implementation Method 1
the rectifier includes a capacitor coupled to a bias resistor, a diode, and a low pass filter. The capacitor, the diode, and the low pass filter together convert the received radio frequency signal into a low frequency signal
Data Source
AI summary
This disclosure discloses methods and apparatus for calibrating received signal strength indicators.