Poly-phased Time-interleaved RF-DAC for Spectral Purity
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Solution Overview
Problem
Conventional RF transmitter designs are frequency and application-specific, suffer from spectral impurities, and require large discrete passive components, leading to inefficiencies in spectral purity and component size, weight, and power consumption.
Innovation Solution
A poly-phased, time-interleaved RF digital-to-analog converter (DAC) system that uses phase-offset versions of waveforms and time-interleaving techniques to cancel nonlinearity and image errors, eliminating the need for large discrete passive filtering components and enabling a wide frequency band with reduced spectral artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional RF transmitter designs use discrete passive filtering components, then spectral purity can be improved, but component size, weight, and power consumption increase
Solution Approach 1:
The patent replaces mechanical/discrete passive filtering components with a digital signal processing approach using poly-phased time-interleaved RF-DACs. The digital architecture performs spectral purification through signal processing algorithms rather than physical filters, eliminating large discrete passive components while maintaining spectral purity.
Solution Approach 2:
The invention changes the operating parameters of the RF-DAC system by using multiple phase-shifted versions of the input signal (poly-phased) with different time-interleaved paths. This parameter transformation allows spectral purification through digital processing rather than physical filtering.
2Object-affected harmful factors
If conventional RF transmitter designs use discrete passive filtering components, then spectral purity can be improved, but power consumption increases
Solution Approach 1:
The patent replaces power-hungry discrete passive filtering components with a digital signal processing architecture. The poly-phased time-interleaved RF-DAC system performs spectral purification through digital operations that consume less power than traditional analog filtering components.
3Device complexity
If conventional RF transmitter designs are frequency-specific, then design complexity can be reduced, but adaptability and frequency agility are limited
Solution Approach 1:
The patent creates a universal RF transmitter architecture using poly-phased time-interleaved RF-DACs that can operate across multiple frequency bands and applications. The digital signal processing core provides multi-functionality, allowing the same hardware to be reconfigured for different frequencies and waveforms without requiring separate dedicated designs.
Solution Approach 2:
The invention introduces dynamic reconfigurability through digital control of the poly-phased time-interleaved RF-DAC system. The ability to dynamically adjust phase shifts, time-interleaving patterns, and digital signal processing parameters enables frequency agility and adaptability across different operating conditions.
4Object-affected harmful factors
If poly-phased time-interleaved RF-DACs are used, then spectral purity is improved and component size is reduced, but device complexity increases
Solution Approach 1:
The patent segments the RF-DAC function into multiple parallel paths (poly-phased time-interleaved structures), where each path handles a portion of the signal processing. This segmentation distributes the complexity across multiple simpler modules rather than requiring a single complex component, making the overall system more manageable despite the increased number of elements.
Data Source
AI summary
In accordance with various embodiments of the disclosed subject matter, a system, apparatus and method is configured to provide a poly-phased, time-interleaved radio frequency (RF) digital-to-analog converter (DAC) suitable for use in radar, radio, mobile and other RF systems.