Wireless PA Feedback Separation for Return Loss and PIMC
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately measuring return loss and improving passive intermodulation cancellation (PIMC) performance due to the difficulty in obtaining feedback and reverse signals simultaneously, which requires multiple analog-to-digital converters (ADCs) and affects real-time calculation and PIM removal efficiency.
Innovation Solution
An electronic device and method that utilize a digital pre-distortion (DPD) circuit, a single ADC for converting composite signals including feedback, filter-feedback, and reverse signals into a digital composite signal, and a separation circuit to extract these signals, enabling real-time return loss measurement and enhanced PIMC performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple ADCs are used to obtain feedback signal and reverse signal simultaneously, then measurement precision and PIMC performance are improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple signal paths (feedback signal path and reverse signal path) into a single ADC by using a composite signal generation approach. The feedback signal from the power amplifier output and the reverse signal from the reflected output are merged into one composite signal that is then converted by a single ADC, eliminating the need for multiple separate ADCs while maintaining measurement precision.
Solution Approach 2:
The single ADC is designed to handle multiple functions: it converts both the feedback signal and the reverse signal simultaneously by processing their composite form. This multi-functional approach allows one ADC to replace what would traditionally require multiple dedicated ADCs, reducing device complexity while maintaining the ability to perform both return loss measurement and PIMC operations.
2Reliability
If multiple ADCs are used to obtain feedback signal and reverse signal simultaneously, then PIMC performance is improved, but hardware requirements and cost increase
Solution Approach 1:
The patent merges the feedback signal and reverse signal into a composite signal that can be processed by a single ADC. This combining approach maintains the quality and reliability of PIMC performance while reducing the quantity of ADCs from multiple to one, thereby lowering hardware requirements and cost.
3Ease of operation
If feedback signal and reverse signal are obtained separately, then signal separation is simplified, but real-time calculation and continuous input are affected
Solution Approach 1:
The patent introduces a composite signal as an intermediary that contains both the feedback signal and reverse signal in a unified form. This composite signal serves as a mediator that allows the system to maintain continuous input for real-time calculation while enabling signal separation through digital signal processing techniques applied to the composite form, rather than requiring separate physical signal paths.
Data Source
AI summary
An electronic device is provided. The electronic device includes a digital pre-distortion (DPD), a digital-to-analog converter (DAC), a power amplifier (PA), a first coupler obtaining a feedback signal from an output of the power amplifier, a circulator obtaining a reverse signal in which the output of the power amplifier is reflected, a transmission filter, a second coupler obtaining a filter-feedback signal from an output of the transmission filter, an antenna, an analog-to-digital converter (ADC) converting a composite signal including the feedback signal, the filter-feedback signal, and the reverse signal into a digital composite signal, a separation circuit, and a pulse inter-modulation cancellation (PIMC) circuit in which the separation circuit, based on the digital composite signal and an input signal of the DPD, obtains a digital signal of the feedback signal, a digital signal of the filter-feedback signal, and a digital signal of the reverse signal.