Clock-Data Edge Alignment Using Phase Calibration in RFDACs
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Solution Overview
Problem
Conventional signal transmitters face challenges in aligning signal edges between input signals, leading to output power degradation and noise increase, particularly in radio-frequency digital-to-analog converters (RFDACs) operating at GHz frequencies.
Innovation Solution
An edge alignment apparatus and method that generate delayed square wave signals and utilize phase tuning signals to align signal edges, comprising a clock source, phase delay circuit, data circuit, and phase calibration circuit, with multiple tuning stages for precise phase adjustment, ensuring signal edges of N-bit digital signals align with clock signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If signal edges are not aligned in RFDAC input signals, then device complexity is reduced, but output power degrades and noise increases
Solution Approach 1:
The patent applies preliminary action by performing edge alignment calibration before the RFDAC operates. The calibration circuit pre-adjusts the phase of input signals using delay elements and control signals to ensure edges are aligned before processing, preventing power degradation and noise increase in advance.
Solution Approach 2:
The patent introduces an intermediary calibration circuit that mediates between the input signals and the RFDAC. This calibration circuit includes phase adjusters and control logic that act as intermediaries to synchronize signal edges without requiring changes to the core RFDAC structure.
2Object-affected harmful factors
If signal edges are not aligned in RFDAC input signals, then ease of operation is maintained, but noise increases
Solution Approach 1:
The calibration circuit performs self-service by automatically detecting edge misalignment and adjusting phases without external intervention. The control logic monitors the signals and autonomously modifies delay settings to eliminate noise-causing misalignment.
Solution Approach 2:
The patent implements feedback through the calibration circuit that continuously monitors signal edges and adjusts phase delay accordingly. The control signal feeds back from the edge detection to the phase adjusters, creating a closed-loop system that eliminates noise while maintaining operational simplicity.
3Manufacturing precision
If multiple phase tuning signals are used for precise alignment, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the phase adjustment into multiple independent delay elements, each controlled by separate tuning signals. This allows precise control of each signal path's phase independently, achieving high alignment precision through modular adjustment stages.
Solution Approach 2:
The patent implements dynamics by making the phase delay adjustable through control signals that can dynamically modify the delay amount. The calibration circuit transitions from fixed delay to variable delay, allowing precise tuning of signal edges based on actual operating conditions.
Data Source
AI summary
An edge alignment apparatus includes: a signal source, for generating a first and a second square wave signals; a phase delay circuit, for receiving the first and the second square wave signals to generate a delayed first and a delayed second square wave signals; a data circuit, for generating a third square wave signal according to the delayed second square wave signal; and a phase calibrating circuit, for receiving the third square wave signal and the delayed first squared wave signal to generate at least one phase tuning signal to the phase delay circuit for tuning a phase difference between the delayed first and the delayed second square wave signals, such that a signal edge of the third square wave signal aligns with that of the first square wave signal. The first, second and third square wave signals have a same frequency.