Wide-Band Diversity Receiver Paths for Low-Loss RF Amplification
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Solution Overview
Problem
In wireless communication systems, diversity receive antennas face challenges in optimizing signal processing due to physical separation, leading to signal attenuation and noise interference, which affects data throughput and signal quality.
Innovation Solution
A receiving system with a controller that selectively activates multiple paths between multiplexers, incorporating bandpass filters and amplifiers to filter and amplify signals to specific frequency bands, and tunable matching circuits to improve impedance matching, thereby reducing signal loss and noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If diversity receive antennas are placed physically far from primary antenna to reduce interference, then signal quality improves, but signal attenuation increases
Solution Approach 1:
The receiving system is divided into multiple independent signal paths, each with its own amplifier and bandpass filter. This segmentation allows each path to be optimized independently, with amplifiers compensating for attenuation in distant diversity antennas while bandpass filters maintain signal quality by removing out-of-band interference.
Solution Approach 2:
Amplifiers and bandpass filters are introduced as intermediary components between the diversity antennas and the signal processing unit. These intermediaries compensate for signal attenuation and selectively pass desired frequency bands, thereby maintaining signal quality despite physical separation between antennas.
2Productivity
If multiple signal paths are added to process signals from diversity antennas, then data throughput increases, but device complexity increases
Solution Approach 1:
The receiving system uses identical amplifier and bandpass filter configurations across multiple signal paths, creating a universal modular architecture. Each path performs the same functions independently, allowing the system to handle multiple frequency bands and signal sources while maintaining manageable complexity through repetition of proven design blocks.
Solution Approach 2:
The system dynamically selects and activates specific signal paths based on which frequency bands are currently in use. The controller enables or disables amplifiers and filters corresponding to active bands, allowing the system to adapt its complexity to actual operational needs rather than maintaining fixed maximum complexity.
3Object-affected harmful factors
If bandpass filters are placed at amplifier outputs to filter signals, then out-of-band noise is reduced, but signal loss increases
Solution Approach 1:
Bandpass filters are positioned after amplifiers in the signal chain, performing filtering as a preliminary action before signals are combined and processed further. This sequencing allows amplifiers to boost both in-band and out-of-band signals, after which the bandpass filter removes out-of-band components, preventing them from causing interference in subsequent processing stages.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances signal processing by reducing signal attenuation, improving noise figure, and increasing data throughput by selectively activating paths and using complementary bandpass filters to attenuate out-of-band frequencies, resulting in improved signal quality and reduced interference.
Implementation Method 1
Each one of the first plurality of bandpass filters can be disposed along a corresponding one of the plurality of paths at an output of a corresponding one of the plurality of amplifiers and can be configured to filter a signal received at the bandpass filter to a respective frequency band
Implementation Method 2
Each one of the plurality of amplifiers can be disposed along a corresponding one of the plurality of paths and can be configured to amplify a signal received at the amplifier
Implementation Method 3
tunable matching circuits to improve impedance matching
Data Source
AI summary
Disclosed herein are configurations and devices for amplifying radio-frequency signals. The devices and configurations include using a wide-band or tunable downstream amplifier to amplify signals in a downstream or back-end module. The signals are first filtered and amplified by an upstream or front-end module that receives a diversity signal from a diversity antenna.