Signal Predistortion Circuit Configuration for Wireless Transceivers
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Solution Overview
Problem
The existing digital predistortion (DPD) circuit configurations in wireless communication systems face challenges in determining accurate predistortion parameters due to severe signal coupling between the transmitting-end (TX) and receiving-end (RX) paths, which is exacerbated by the short distance between these paths, leading to insufficient insulation and increased costs when additional components are added to mitigate this issue.
Innovation Solution
The proposed signal predistortion circuit configuration includes a DPD circuit and two transceiver circuits, where the first transceiver circuit and the second transceiver circuit are configured to create longer distances between the TX and RX paths, thereby reducing signal coupling. This configuration uses the first transmitting circuit, the first analog-front-end (AFE) circuit, and the second receiving circuit as a signal loop for one DPD training process, and the second transmitting circuit, the second AFE circuit, and the first receiving circuit as a signal loop for another DPD training process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between TX path and RX path is shortened to optimize circuit area, then circuit area is reduced, but signal coupling between TX path and RX path increases
Solution Approach 1:
The patent divides the signal reception function into two separate paths: a first receiving circuit that receives signals from the first transmitting circuit, and a second receiving circuit that receives signals from the second transmitting circuit. This segmentation allows the TX and RX paths to be physically separated, reducing signal coupling while maintaining compact circuit area through functional distribution across multiple circuits.
2Object-affected harmful factors
If additional components (coupler, feedback circuit, switch) are added to increase distance between TX and RX paths, then signal coupling is reduced, but device complexity and cost increase
Solution Approach 1:
The patent makes the first and second transceiver circuits serve multiple functions: they act as both transmitting circuits and receiving circuits, and can be configured to perform DPD training in different modes. This multi-functionality eliminates the need for separate dedicated components, reducing circuit complexity while achieving the goal of increasing effective distance between TX and RX paths.
Solution Approach 2:
The patent introduces mode switching capability where the transceiver circuits can dynamically change their operational state between different DPD training modes. This dynamic configuration allows the system to adapt the signal paths based on training requirements, effectively increasing the distance between TX and RX paths during training without adding permanent complex components.
3Object-affected harmful factors
If additional components are added to mitigate signal coupling, then signal coupling is reduced, but manufacturing cost increases
Solution Approach 1:
The patent combines the functions of multiple circuits into integrated transceiver units where each unit contains both transmitting and receiving capabilities. This merging approach reduces the total number of separate components needed, simplifying manufacturing processes and reducing costs while achieving effective isolation between TX and RX paths through the multi-circuit architecture.
Data Source
AI summary
A signal predistortion circuit configuration includes a digital predistortion (DPD) circuit, a first transceiver, and a second transceiver, and can reduce the influence of poor signal path insulation when performing a DPD training. During the DPD training, the DPD circuit transmits a training signal through a first signal path to adjust first predistortion parameters, and transmits a training signal through a second signal path to adjust second predistortion parameters. The first signal path includes: a transmitting circuit and an analog-front-end circuit of the first transceiver, a receiving analog circuit and a switch circuit of the second transceiver, and a switch circuit and an analog-to-digital converter (ADC) of the first transceiver. The second signal path includes: a transmitting circuit and an analog-front-end circuit of the second transceiver, a receiving analog circuit and the switch circuit of the first transceiver, and the switch circuit and an ADC of the second transceiver.