Parallel Delta-Sigma RF Power Amplifier for High-PAPR Signals
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Solution Overview
Problem
Current power amplifier architectures face limitations in achieving high power conversion efficiency, particularly for RF applications, due to constraints in switching speed and bandwidth, which are exacerbated by the high peak-to-average power ratio (PAPR) of modern communication signals, leading to inefficiencies and increased heat dissipation.
Innovation Solution
The implementation of a parallel delta sigma modulator architecture that allows for un-constrained noise shaping filters and frequency up-conversion, enabling operation at higher frequencies and reducing PAPR, thereby improving power conversion efficiency by utilizing a switch-mode power amplifier with a '0' state to minimize power dissipation and leveraging a frequency up-converter for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional power amplifier architectures are used, then the amplifier can operate at lower frequencies, but power conversion efficiency is limited and heat dissipation increases
Solution Approach 1:
The input signal is divided into multiple parallel data streams, each processed by a separate delta-sigma modulator. This segmentation allows each modulator to operate at lower individual rates while achieving the overall required performance, improving power conversion efficiency and reducing heat dissipation in each amplifier stage
Solution Approach 2:
The patent transitions from single-stream serial processing to multi-stream parallel processing, adding a dimensional aspect to the signal flow. This parallel architecture enables better distribution of processing load and improved efficiency by allowing simultaneous operation of multiple amplifiers in parallel
2Productivity
If switching speed is increased to improve efficiency, then bandwidth constraints are violated and signal integrity deteriorates
Solution Approach 1:
By segmenting the signal into parallel streams processed at lower switching rates, the system achieves high overall productivity without requiring any single amplifier to switch at excessively high speeds, thus maintaining bandwidth integrity and signal quality
Solution Approach 2:
The patent changes the operating parameters of each amplifier stage by distributing the total signal across multiple parallel channels, each operating at optimized switching speeds that balance efficiency requirements with bandwidth constraints
3Power
If high PAPR signals are amplified, then power conversion efficiency decreases and linearity requirements increase
Solution Approach 1:
The high PAPR signal is segmented into multiple parallel streams with reduced individual PAPR values. Each stream is amplified separately with relaxed linearity requirements, improving overall power conversion efficiency while maintaining the required output power through constructive combination of parallel outputs
Data Source
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AI summary
A parallel delta sigma modulator architecture is disclosed. The parallel delta sigma modulator architecture includes a signal demultiplexer configured to receive an input signal and to demultiplex the input signal to output a plurality of streams, a plurality of delta sigma modulators executing in parallel, each delta sigma modulator configured to receive a stream from the plurality of streams and to generate a delta sigma modulated output, and a signal multiplexer configured to receive a plurality of delta sigma modulated outputs from the plurality of delta sigma modulators and to multiplex together the plurality of delta sigma modulated outputs into a pulse train.