Dual-Path AFE Circuit Layout for High-Linearity Mode Switching
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Solution Overview
Problem
Existing dual-path analog-front-end circuits and signal receivers face linearity degradation due to switches being set on the signal reception path, affecting the quality of reception signals, especially in adaptive processing between long-distance and short-distance transmission modes.
Innovation Solution
A dual-path analog-front-end circuit and signal receiver design that includes two reception circuits and a multiplexer, where switches are not on the signal path, allowing for adaptive power consumption based on transmission distance without degrading linearity, using a first and second passive-component circuit, amplifier circuits, and a multiplexer to generate and output analog input signals in different modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switches are placed on the signal reception path to enable adaptive processing between long-distance and short-distance transmission modes, then the receiver can adaptively process reception signals according to transmission distance, but the linearity of the receiver is degraded
Solution Approach 1:
The reception circuit is divided into two separate paths: a first reception circuit for long-distance transmission mode and a second reception circuit for short-distance transmission mode. Each path has its own switch circuit positioned outside the signal reception path, allowing independent control without affecting the other path's linearity. The multiplexer selects between the two paths based on transmission distance requirements.
Solution Approach 2:
A multiplexer is introduced as an intermediary component to select between the first and second reception circuits based on transmission distance. This mediator allows adaptive mode switching without requiring switches to be placed directly in the signal reception path, thereby preserving linearity while enabling adaptability.
2Reliability
If a high power consumption circuit is used to process long-distance reception signals, then the signal quality is improved, but the power consumption increases
Solution Approach 1:
The reception circuit dynamically switches between first and second reception circuits based on transmission distance requirements. The first reception circuit with higher power consumption is activated only when long-distance transmission is detected, while the second reception circuit with lower power consumption is used for short-distance transmission, optimizing the balance between signal quality and power consumption.
Solution Approach 2:
The system changes operational parameters (power consumption level) based on transmission distance. By detecting transmission distance and switching between different reception circuits with different power consumption characteristics, the system adapts its power usage to match the actual signal quality requirements.
Data Source
AI summary
Disclosed are a dual-path analog-front-end (AFE) circuit and a dual-path signal receiver characterized by high linearity. The dual-path AFE circuit includes a first reception circuit, a second reception circuit and a multiplexer. The first reception circuit is configured to generate a first analog input signal according to a reception signal in a first mode and configured to be coupled to a first constant-voltage terminal via a first switch circuit in a second mode. The second reception circuit is configured to generate a second analog input signal according to the reception signal in the second mode and configured to be coupled to a second constant-voltage terminal via a second switch circuit in the first mode. The multiplexer is configured to output the first analog input signal in the first mode and output the second analog input signal in the second mode.