Transceiver Auxiliary Receiver Calibration via Capacitive Coupling
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Solution Overview
Problem
Prior art transceivers face signal distortion due to non-linear power amplifier operation, which is mitigated by using an auxiliary receiver path for digital pre-distortion, but this introduces errors due to non-idealities in the receiver path.
Innovation Solution
A wireless transceiver with a calibration path that injects a calibration tone into the transmit path and couples the response through capacitive coupling to the receive path, allowing for improved calibration and digital pre-distortion without compromising the stability of the transmit path during regular operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the auxiliary receiver path is used for digital pre-distortion to correct non-linear power amplifier distortion, then signal linearity is improved, but measurement precision deteriorates due to non-idealities in the receiver path
Solution Approach 1:
The patent divides the receiver path into two separate paths: a primary receiver path for normal signal reception and an auxiliary receiver path dedicated to calibration and pre-distortion measurements. This segmentation allows the auxiliary path to be optimized for measurement functions without compromising the primary path's reception performance, and enables independent calibration of the auxiliary path using test signals.
Solution Approach 2:
The patent introduces a test signal generator and isolation components as intermediaries to couple the transmit path to the auxiliary receiver path. This intermediary arrangement allows the auxiliary path to measure transmit path characteristics without being directly exposed to the full power transmit signal, protecting the sensitive receiver components while enabling accurate measurements.
2Device complexity
If the receiver path is used to sample the transmitted signal for pre-distortion, then device complexity is reduced, but reliability deteriorates due to errors introduced by non-ideal receiver components
Solution Approach 1:
The patent segments the receiver functionality into primary reception and auxiliary calibration functions, with the auxiliary path dedicated to reliability-critical measurement tasks. This allows the system to use existing receiver hardware for calibration without requiring a completely separate measurement system, balancing complexity and reliability.
Solution Approach 2:
The patent changes the operational parameters of the auxiliary receiver path during calibration mode, including adjusting gain settings, switching off noise-canceling features, and optimizing bandwidth to match the specific measurement requirements. This parameter optimization improves measurement reliability without requiring additional hardware.
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
This approach minimizes additional hardware and maintains isolation between the transmit and receive paths, providing accurate calibration and reducing signal distortion while accounting for non-idealities in the receiver path, thus enhancing the linearity and efficiency of the transceiver.
Implementation Method 1
a first capacitive coupling to couple a response to the calibration tone from the transmit signal path to the first data signal path; and a second capacitive coupling to couple a response to the calibration tone from the transmit signal path to the second data signal path
Data Source
AI summary
A wireless transceiver. The transceiver includes: (i) a transmit signal path; (ii) a calibration path, comprising a conductor to connect a calibration tone into the transmit signal path; (iii) a receive signal path, comprising a first data signal path to process a first data and a second data signal path, different than the first data signal path, to process a second data; (iv) a first capacitive coupling to couple a response to the calibration tone from the transmit signal path to the first data signal path; and (v) a second capacitive coupling to couple a response to the calibration tone from the transmit signal path to the second data signal path.