Channelized Amplifier System Spectral Purity
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Solution Overview
Problem
Non-linear amplifiers produce out-of-band emissions and spectral re-growth, which existing methods, such as pre-distorter circuits or highly linear but less-efficient amplifiers, have not sufficiently mitigated, leading to undesirable harmonic and inter-modulation spectral components that exceed permissible spectral bands.
Innovation Solution
The use of channelized high-efficiency non-linear power amplifiers, frequency dividers, and band-pass filters to control spectral re-growth by dividing signals into multiple frequency bands, amplifying them, and recombining them with additional filtering to minimize inter-modulation frequency components and reduce RF loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If non-linear amplifiers are used to deliver maximum output power, then power efficiency is improved, but out-of-band emissions and spectral re-growth increase
Solution Approach 1:
The input signal is divided into multiple frequency bands using a frequency divider, with each band being amplified by a separate non-linear amplifier. This segmentation allows each amplifier to operate efficiently while the combined output maintains spectral purity through subsequent filtering.
Solution Approach 2:
A band-pass filter is introduced as an intermediary component between the frequency combiner and the output. This filter suppresses out-of-band emissions and spectral re-growth generated by the non-linear amplifiers, allowing them to operate at high efficiency without causing harmful emissions.
2Object-generated harmful factors
If traditional filtering methods are used to suppress spectral re-growth, then out-of-band emissions are reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
By segmenting the signal into frequency bands before amplification, the system reduces the spectral re-growth generated by each individual amplifier. This approach simplifies the filtering requirements compared to filtering a single wideband signal amplified by a single non-linear amplifier.
Solution Approach 2:
Multiple amplified frequency bands are combined using a frequency combiner before the final band-pass filter. This merging approach allows the system to achieve spectral purity with less stringent filter requirements than would be needed for a single-channel approach.
3Object-generated harmful factors
If highly linear amplifiers are used to reduce spectral re-growth, then spectral purity is improved, but power efficiency decreases
Solution Approach 1:
The signal is divided into multiple frequency bands, each amplified by non-linear amplifiers operating at high efficiency. The segmentation allows these amplifiers to operate in their optimal efficiency range while the overall system maintains spectral purity through the combination and filtering process.
Data Source
AI summary
A channelized amplification system and method for mitigating non-linear amplification effects and controlling spectral re-growth is disclosed. A channelized amplifier system includes a frequency divider, a plurality of distributors coupled to the frequency divider, and a plurality of amplification modules coupled to the plurality of distributors. Each of the plurality of amplification modules includes a plurality of channelized non-linear amplifiers, a frequency combiner having a plurality of band-pass filters and coupled to the plurality of channelized non-linear amplifiers, and a band-pass filter coupled to the frequency combiner.