Hybrid-Coupled RF DAC for Precise I/Q Phase Generation
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Solution Overview
Problem
Current digital-to-analog converters (DACs) face challenges in efficiently generating radio frequency (RF) signals, particularly at high frequency ranges like millimeter wave frequencies, due to limitations in generating in-phase and quadrature signals with precise phase differences for effective transmission.
Innovation Solution
The proposed DAC design includes a hybrid coupler and column-and-line architecture, utilizing a single clock signal to generate in-phase and quadrature signals through an array of unit power amplifiers and matching circuits, with a 90-degree hybrid coupler providing phase shift for quadrature signals, enabling efficient RF signal generation and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single clock signal is used to generate both in-phase and quadrature signals, then device complexity is reduced, but generating precise phase differences becomes more difficult
Solution Approach 1:
A hybrid coupler is introduced as an intermediary component between the single clock signal source and the in-phase/quadrature signal paths. The hybrid coupler receives the single clock signal and internally generates the required 90-degree phase-shifted quadrature signals, thereby maintaining precise phase relationships while using only one clock input line to the DAC structure.
Solution Approach 2:
The functionality of multiple clock signal generation paths is merged into a single clock input by using the hybrid coupler to simultaneously produce both in-phase and quadrature clock signals from one source. This consolidation reduces the number of external clock lines while maintaining the precision required for quadrature signal generation.
2Manufacturing precision
If multiple clock lines are used to generate in-phase and quadrature signals, then phase precision is improved, but device complexity increases
Solution Approach 1:
The hybrid coupler serves as an intermediary that internally generates multiple phase-shifted clock signals from a single input, eliminating the need for multiple external clock lines while maintaining precise phase relationships between in-phase and quadrature signals.
Solution Approach 2:
The hybrid coupler performs multiple functions: it acts as a signal distributor, phase shifter, and clock signal generator simultaneously. By making this single component multi-functional, the patent eliminates the need for separate clock lines while maintaining phase precision.
3Productivity
If hybrid coupler is used to provide phase shift, then transmission efficiency is improved, but signal reflections may occur
Solution Approach 1:
The hybrid coupler is positioned as an intermediary component between the DAC output and the transmission line, providing controlled impedance transitions and phase shifts. Its design includes impedance matching features that minimize reflections while maintaining the required 90-degree phase shift for quadrature signal generation.
Solution Approach 2:
The hybrid coupler is designed with specific electrical parameters (impedance values, physical dimensions, material properties) that are optimized to minimize signal reflections. By carefully controlling these parameters, the coupler achieves both efficient signal transmission and reduced harmful reflections.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for effective generation and transmission of RF signals with precise phase differences, enhancing the performance of electronic devices in high-frequency applications such as 5G communications by reducing signal reflections and improving transmission efficiency.
Implementation Method 1
a hybrid coupler coupled to the first matching circuit and the second matching circuit. In some embodiments, only a single clock line is needed to generate in-phase and quadrature component based on the in-phase digital code line and the quadrature digital code line
Implementation Method 2
The hybrid coupler may delay the second signal to generate a delayed second signal having a second phase and output the delayed second signal for transmission by the one or more antennas
Data Source
AI summary
The current disclosure is related to a column and line digital-to-analog converter (DAC) with a hybrid coupler for generating quadrature analog signals. The DAC may include an array of unit power amplifiers (cells). A first portion of the cells of the array may be coupled to a first column decoder to receive in-phase components of digital signals and a second portion of the cells may be coupled to a second column decoder to receive quadrature components of the digital signals. The first portion of the cells of the array may generate in-phase components of analog signals and the second portion of the cells of the array may generate quadrature components of the analog signals. A hybrid coupler of the DAC may receive the in-phase and quadrature components of the analog signals with a similar phase, delay the quadrature components by a phase delay (e.g., 90 degrees), and output the resulting analog signals.