Wireless RF Calibration Using Coupler Feedback and Power Detection
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Solution Overview
Problem
Existing wireless communication circuits face challenges in minimizing signal distortion and ensuring accurate power transmission for high-frequency band communication, necessitating effective calibration processes to maintain communication performance.
Innovation Solution
The implementation of a coupler, power detector, feedback receiver, and modem within the wireless communication circuit to generate and process feedback signals, allowing for calibration based on power values and code values to adjust circuit elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple chipsets are used to support high-frequency band wireless communication, then the wireless communication capability is improved, but the signal distortion increases and communication performance deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where a coupler extracts a portion of the transmission signal and feeds it back to a power detector, which then provides feedback to the modem. This closed-loop feedback system enables real-time monitoring and adjustment of signal characteristics, allowing the system to compensate for distortions introduced by multiple chipsets and maintain communication performance.
Solution Approach 2:
The patent replaces manual or external calibration processes with an automated electronic calibration system. The modem automatically calculates power values based on detector output and performs calibration of circuit elements through digital processing, substituting mechanical adjustment mechanisms with electronic control and computation.
2Reliability
If calibration process is implemented to prevent signal distortion, then communication performance is improved, but the device complexity increases
Solution Approach 1:
The patent merges the calibration function into the existing modem architecture. The modem integrates the power calculation unit and calibration control, combining multiple functions (modulation, power control, calibration) into a single processing unit. This consolidation reduces overall system complexity compared to having separate dedicated calibration hardware.
Solution Approach 2:
The coupler and power detector are designed to serve multiple functions: they enable both transmission monitoring and calibration operations. The same feedback path is used for both real-time power control and calibration measurements, allowing a single hardware structure to fulfill multiple roles and reduce the need for additional specialized components.
3Measurement precision
If power detector and feedback receiver are added to monitor transmission signal, then signal accuracy is improved, but the device complexity increases
Solution Approach 1:
The coupler acts as an intermediary element that extracts a small portion of the transmission signal without significantly affecting the main signal path. By using this intermediate sampling approach, the system achieves accurate power measurement while minimizing the impact of the monitoring mechanism on the overall system complexity and signal integrity.
Data Source
AI summary
An electronic device may comprise: a coupler which is disposed on a wire for connecting an RFFE and an antenna in the wireless communication circuit, and generates a feedback signal of a transmission signal to be transmitted through the antenna; a power detector for providing an output voltage corresponding to the feedback signal provided from the coupler; a feedback reception unit which receives the feedback signal provided from the coupler and is disposed within an RFIC of the wireless communication circuit; and a modem for calculating a first power value of the transmission signal based on the output voltage provided from the power detector, and receiving, from the RFIC, a code value of the feedback signal, the code value being generated based on the feedback signal provided to the feedback reception unit, wherein calibration for at least one element in the wireless communication circuit is performed based on the first power value and the code value.