Differential Skew Generation Using IQ Modulation and Synchronized PPGs
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Solution Overview
Problem
Existing mechanical delay adapters for adjusting differential skew have limitations in repeatability, resolution, and variable range, and their calibration is not precise, making it difficult to separate the effects of skew from other transmission characteristics.
Innovation Solution
A differential skew generation device and method using synchronized signal generators with IQ modulation to adjust skew by integer and decimal units of unit interval (UI), allowing precise control of differential skew without manual physical operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical delay adapter is used to adjust differential skew, then the variable range can be increased, but the resolution deteriorates
Solution Approach 1:
The patent replaces the mechanical delay adapter system with an electronic signal generation system using two synchronized PPGs. Instead of mechanically varying line length, the system electronically generates positive and negative signals with precisely controllable timing differences through IQ modulation, eliminating mechanical limitations while achieving both wide variable range and high resolution.
Solution Approach 2:
The patent changes the control parameter from mechanical line length to electronic phase angle and timing parameters. By controlling the phase angle through IQ modulation and the transmission timing in units of UI, the system achieves precise skew adjustment with high resolution while maintaining a wide variable range, resolving the trade-off between these two parameters.
2Adaptability or versatility
If a mechanical delay adapter is used to adjust differential skew, then the skew amount can be varied, but the repeatability deteriorates
Solution Approach 1:
The patent replaces the mechanical delay adapter with an electronic system using synchronized PPGs. The electronic control of signal timing through IQ modulation and UI-based timing shifts provides precise, repeatable skew adjustment without the mechanical wear, positioning errors, and calibration drift that affect repeatability in mechanical systems.
Solution Approach 2:
The patent implements synchronization between the two PPGs operating with a common clock signal, ensuring that the timing relationships are precisely maintained and repeatable. The system uses feedback control through the synchronized operation to maintain consistent skew amounts across multiple measurements and adjustments.
3Ease of operation
If a mechanical delay adapter is used to adjust differential skew, then the skew adjustment can be performed, but the calibration precision deteriorates
Solution Approach 1:
The patent replaces the mechanical delay adapter requiring physical calibration with an electronic system where skew is controlled through digital parameters. The synchronized PPGs generate signals with precisely defined timing relationships based on UI units, eliminating the need for mechanical calibration and providing inherent calibration precision through the digital timing reference.
4Adaptability or versatility
If a mechanical delay adapter is inserted to adjust skew, then the skew effect can be introduced, but the separation of skew effects from other transmission characteristics deteriorates
Solution Approach 1:
The patent extracts the skew effect from the mechanical adapter that also introduces other transmission characteristics. By using two synchronized PPGs to generate positive and negative signals, the system introduces only the desired skew effect without the frequency characteristics, insertion loss, and calibration reference changes that come with inserting a mechanical adapter into the transmission path.
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
Enables precise and repeatable adjustment of differential skew with wide variable range and high resolution, improving convenience and enabling separate evaluation of skew effects without affecting transmission characteristics.
Implementation Method 1
clock oscillator that oscillates and outputs a clock signal
Implementation Method 2
a phase angle is adjusted by in-phase and quadrature-phase (IQ) modulation of the clock signal
Data Source
AI summary
A differential skew generation device 1 includes: a clock oscillator 2 that oscillates and outputs a clock signal; a first signal generator (PPG) 4A that outputs a positive signal to an evaluation target W at a timing of a signal in which a phase angle is adjusted by in-phase and quadrature-phase (IQ) modulation of the clock signal; and a second signal generator (PPG) 4B that outputs a negative signal to the evaluation target W at a timing of a signal in which a phase angle is adjusted by IQ modulation of the clock signal. The first signal generator (PPG) 4A and the second signal generator (PPG) 4B operate in synchronization with each other and allocate an integer unit of a unit interval (UI) of a set skew amount to transmission timing shift and a decimal unit to IQ modulation.