Distributed RF Conversion Using Reactive-Impedance Waveform Combining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for converting digital data to radio-frequency (RF) signals struggle to operate over a wide range of carrier frequency bands and produce high-level output signals with high power-added efficiency, as they are limited by narrowband structures and poor power-added efficiency due to intrinsic capacitances and impedance-matching circuits.
Innovation Solution
The use of reactive-impedance networks, specifically singly-terminated or doubly-terminated networks with shunt capacitive and series inductive reactances, to boost and combine binary or modulated-carrier waveforms, allowing for operation over a wider range of carrier frequencies with higher power-added efficiency by employing Class D or AB amplifiers and ensuring equal propagation delays across signal paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional digital-to-analog converters with weighted resistor networks or switched current sources are used, then digital data can be converted to analog signals, but the accumulation of intrinsic capacitances limits the speed and bandwidth of the converters
Solution Approach 1:
The patent divides the digital-to-analog conversion process into multiple parallel segments, each handling a subset of digital inputs. By segmenting the converter into multiple smaller units with fewer capacitors each, the total capacitance accumulation at any single node is reduced, thereby improving conversion speed and bandwidth while maintaining the ability to process multiple digital inputs simultaneously
Solution Approach 2:
The patent transitions from a single-dimensional weighted summing approach to a multi-dimensional architecture where digital inputs are processed through multiple parallel paths with different weighting schemes. This dimensional expansion allows the system to achieve high-speed conversion by distributing the capacitive load across multiple dimensions rather than concentrating it in a single summing node
2Loss of energy
If impedance-matching circuits such as resonating output filters are used for maximum power transfer, then power transfer efficiency is improved, but the narrowband nature of these circuits limits the operating frequency range
Solution Approach 1:
The patent designs the digital-to-analog converter and subsequent RF amplifier stages to perform multiple functions across different frequency bands. The converter architecture is universally applicable to various carrier frequencies by adjusting the weighting coefficients and amplifier gain settings, eliminating the need for dedicated narrowband impedance-matching circuits for each frequency band
Solution Approach 2:
The patent employs dynamically adjustable weighting networks and gain control mechanisms that can adapt to different operating frequencies. By making the converter parameters dynamic rather than fixed, the system maintains optimal power transfer efficiency across a wide frequency range without requiring static narrowband matching circuits
3Power
If power amplifiers are designed for high power handling capabilities and power-added efficiency, then output signal level is improved, but the intrinsic capacitances and narrowband structures limit the operating frequency range
Solution Approach 1:
The patent segments the power amplification function into multiple parallel amplifier stages, each operating at a lower power level but collectively delivering high total output power. This segmentation reduces the capacitance burden on each individual amplifier stage and allows each stage to operate efficiently across a wider frequency range, while the combined output achieves the required high signal level
Data Source
AI summary
Provided are, among other things, systems, apparatuses methods and techniques for converting digital data to radio-frequency (RF) signals. One such apparatus includes a reactive-impedance network within which the levels of multiple binary waveforms are individually boosted, before being combined to produce a single, composite output signal.