Multi-Path Receiver Front End for Independent Gain Selection
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Solution Overview
Problem
Conventional front-end circuits in wireless devices cannot simultaneously optimize the gain for multiple receivers sharing the same radio frequency input, leading to suboptimal performance and reduced dynamic range due to signal power degradation and inability to use multiple receivers simultaneously.
Innovation Solution
A front-end circuit with multiple transmissive signal paths and switching mechanisms allows each receiver subsystem to select the optimal amplification path based on signal strength, enabling individual gain adjustment for each receiver to maintain signal power within its dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common pre-amplifier with fixed gain is used for multiple receivers, then the device complexity is reduced, but the receiving performance and dynamic range are degraded
Solution Approach 1:
The common pre-amplifier is segmented into multiple independent signal paths, each with its own variable gain amplifier. This allows each receiver subsystem to have dedicated gain control while sharing the common input stage, resolving the contradiction between circuit simplicity and performance optimization.
Solution Approach 2:
Fixed gain amplifiers are replaced with variable gain amplifiers that can dynamically adjust their amplification level. This dynamic control enables each receiver to optimize its gain setting based on signal strength requirements, improving receiving performance while maintaining a relatively simple overall architecture.
2Reliability
If the pre-amplifier gain is increased to optimize reception of large input signals, then the dynamic range is improved for strong signals, but the sensitivity for weak signals is degraded
Solution Approach 1:
Variable gain amplifiers enable dynamic adjustment of amplification levels, allowing the system to adapt to different signal strengths. Weak signals can be amplified with high gain to maintain sensitivity, while strong signals can be processed with lower gain to prevent saturation, thus maintaining a wide dynamic range.
Solution Approach 2:
The gain parameter of the amplifiers is made variable rather than fixed. By changing the amplification parameter based on signal strength requirements, the system can optimize performance for both weak and strong signals, achieving both high sensitivity and wide dynamic range.
3Reliability
If the pre-amplifier gain is decreased to optimize reception of weak signals, then the sensitivity is improved, but the ability to handle large input signals is degraded
Solution Approach 1:
Multiple signal paths with independent variable gain amplifiers allow weak signal reception to be optimized in one path without compromising the ability to handle strong signals in other paths. Each receiver subsystem can select the appropriate gain setting for its specific signal conditions.
Solution Approach 2:
The amplification parameter is made adjustable, allowing the system to use high gain for weak signals to improve sensitivity, and low gain for strong signals to maintain signal power tolerance. This parameter flexibility resolves the contradiction between sensitivity and signal handling capability.
4Reliability
If time-sharing operation is used to allow each receiver to set optimal front-end gain, then the receiving performance for each receiver is optimized, but the productivity is reduced due to inability to use multiple receivers simultaneously
Solution Approach 1:
The signal path is segmented into multiple independent channels, each with its own variable gain amplifier. This segmentation allows multiple receivers to operate simultaneously with independently optimized gain settings, eliminating the need for time-sharing while maintaining optimal performance for each receiver.
Data Source
AI summary
A front end receiver is disclosed. The front end receiver comprises a plurality of transmissive signal paths originating from one signal input, a plurality of switching mechanisms; and at least one path of the plurality of transmissive signal paths including a first amplifier coupled to a first input port of each of the plurality of switching mechanisms. The front end receiver also comprises at least another path of the plurality of transmissive signal paths including a second amplifier coupled to a second input port of each of the plurality of switching mechanisms. The receiving subsystem coupled to the output port of each switching mechanism. Each of the receiving subsystems controls a switching mechanism to select the path that is optimal for radio reception depending on the strength of signal being received.