Non-Uniform Distributed Amplifier Filtering for UWB Interference Rejection
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Solution Overview
Problem
Current distributed amplifiers (DAs) struggle to effectively control their frequency response, particularly in the stop-band, which is crucial for wideband communications like ultra-wideband (UWB) systems to mitigate interference with existing wireless services, and they often fail to utilize the full available spectrum due to high circuit complexity and power consumption.
Innovation Solution
The implementation of non-uniform filtering structures, such as Butterworth and Chebyshev filtering, in DAs to synthesize artificial transmission lines, allowing for better control of the frequency response in both pass-band and stop-band, and the use of distributed transversal filters for pulse shaping and interference suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional uniform transmission lines are used in distributed amplifiers, then the amplifier achieves wide bandwidth, but the stop-band control is poor and interference rejection is insufficient
Solution Approach 1:
The patent applies local quality by making the transmission line segments non-uniform, where each section has different characteristic impedances and electrical lengths tailored to provide specific filtering characteristics. This allows the amplifier to have different properties in different frequency ranges: wide passband for signal transmission and attenuated stopband for interference rejection.
Solution Approach 2:
The patent changes the parameters of the transmission line segments, specifically varying the characteristic impedance and electrical length of each section. By optimizing these parameters, the amplifier achieves both wide bandwidth in the passband and improved stopband attenuation, resolving the contradiction between bandwidth and interference rejection.
2Object-affected harmful factors
If digital FIR filters and ultra-high-speed ADCs are used for spectrum control, then frequency response control is improved, but circuit complexity and power consumption increase significantly
Solution Approach 1:
The patent replaces the digital signal processing system (FIR filters and ADCs) with an analog filtering structure implemented through non-uniform transmission lines. This substitution achieves frequency response control in the analog domain, avoiding the need for ultra-high-speed ADCs and complex digital processing, thus reducing circuit complexity and power consumption.
Solution Approach 2:
The non-uniform transmission line segments act as an intermediary structure that provides frequency-selective filtering directly in the signal path. This intermediary structure achieves spectrum control without requiring separate digital filtering stages, simplifying the overall system architecture.
3Object-affected harmful factors
If digital signal processing circuitry is used for interference suppression, then frequency response control is improved, but power consumption increases
Solution Approach 1:
The patent replaces power-consuming digital signal processing circuitry with passive non-uniform transmission line structures that provide interference suppression through their inherent filtering characteristics. This analog approach eliminates the need for active digital processing, significantly reducing power consumption while maintaining interference suppression capability.
Data Source
AI summary
A distributed amplifier uses non-uniform filtering structures to provide better control over pass-band and stop-band characteristics. The various sections can have different tap coefficients. A notch filter can be implemented for interference suppression or pulse shaping in an ultra-wideband transceiver.