RF Signal Circuit Shared Bandpass Filter SRS Path Loss
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Solution Overview
Problem
Mobile communication apparatuses face challenges in conducting high-precision Sound Reference Signaling (SRS) due to significant differences in path loss between transmission and reception paths, particularly in configurations involving band pass filters and switches.
Innovation Solution
A radio-frequency signal sending/receiving circuit is designed with specific terminal and switch configurations, including low-noise amplifiers and band pass filters, to minimize path loss differences between SRS sending and receiving signals, using shared band pass filters and optimized switch configurations to ensure consistent signal transmission and reception paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate band pass filters are used for transmission and reception paths, then each path can be optimized independently, but path loss differences increase and SRS precision deteriorates
Solution Approach 1:
The patent merges the band pass filter functionality into a single shared component that serves both transmission and reception paths. Specifically, the band pass filter is positioned in the common path where signals from multiple antennas converge before being processed by the low noise amplifier, ensuring that both SRS transmission and reception signals pass through the same filter with identical characteristics, thereby eliminating path loss differences while maintaining system precision
Solution Approach 2:
The band pass filter is designed to perform multiple functions simultaneously: it filters both transmission signals (including SRS) and reception signals through the same physical component. The filter handles multiple signal types (uplink, downlink, SRS) and multiple antenna inputs, providing universal filtering functionality that ensures consistent electrical characteristics across all signal paths without requiring separate filters for each function
2Adaptability or versatility
If multiple switches are used to route signals between antennas and amplifiers, then signal routing flexibility increases, but path loss differences between transmission and reception paths increase
Solution Approach 1:
The patent introduces a common signal path as an intermediary that equalizes the electrical characteristics between transmission and reception paths. By routing both SRS transmission and reception signals through the same sequence of components (band pass filter, low noise amplifier, switches) in the common path, the intermediary structure ensures that path losses are matched, allowing precise SRS measurement while maintaining routing flexibility through proper switch configuration
3Reliability
If separate transmission paths are used for SRS sending and receiving signals, then each path can be independently optimized, but path loss differences increase and communication quality deteriorates
Solution Approach 1:
The patent merges the SRS transmission and reception paths into a single common signal path that shares all critical components including the band pass filter, low noise amplifier, and switch matrix. This merging ensures that both signals experience identical path losses and electrical characteristics, improving communication reliability and quality while simplifying the overall device architecture by eliminating redundant separate paths
Data Source
AI summary
A radio-frequency signal sending/receiving circuit includes a low-noise amplifier electrically connected to a first terminal, a first switch electrically connected to the input terminal of the low-noise amplifier, a band pass filter electrically connected at one end to the other end of the first switch and at the other end to a first antenna via a fourth terminal, a power amplifier electrically connected to a second terminal, a second switch electrically connected at one end to the output terminal of the power amplifier and at the other end to the band pass filter, a third switch electrically connected at one end to the output terminal of the power amplifier and at the other end to a fifth terminal, and a fourth switch electrically connected at one end to a third terminal and at the other end to the fifth terminal.