Digital Phase Variation Generation Using Bit Pattern Serialization
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Solution Overview
Problem
Current techniques for generating phase variation in digital signals, such as jitter and wander, are limited in resolution and often rely on analog methods that require complex calibration and are not fully digital.
Innovation Solution
The system employs high-speed serializer and deserializer circuitry combined with waveform generator circuitry to create a digital signal with desired phase variations by modifying bit patterns, allowing for precise control of logic transitions and generating clock or control signals with specific phase changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analog techniques are used to generate phase variation, then the ability to generate desired phase variation is achieved, but the resolution is limited and complex calibration is required
Solution Approach 1:
The patent replaces analog voltage-controlled delay lines and oscillator frequency adjustment mechanisms with a fully digital implementation. A pattern generator creates digital bit patterns representing the desired phase variation, which are then converted to parallel data and serialized to generate the output signal with precise phase characteristics. This substitution of analog mechanical/electrical systems with digital logic eliminates the need for complex analog calibration while achieving higher resolution phase control.
2Measurement precision
If voltage controlled delay lines or fixed delay lines are used, then phase variation can be generated, but the resolution is limited
Solution Approach 1:
The patent implements a dynamic digital pattern generator that can adaptively create bit patterns corresponding to any desired phase variation waveform. The system uses a parallel-to-serial converter that can be programmed with different pattern sequences, allowing the phase characteristics to be dynamically changed without hardware modifications. This provides both high resolution (through precise digital control of bit transitions) and high flexibility (through programmable pattern generation), resolving the contradiction between these two parameters.
3Measurement precision
If PLL or DLL feedback circuits with adjustable delay are used, then phase variation can be implemented, but the resolution and precision are insufficient
Solution Approach 1:
The patent extracts the phase variation generation function from complex feedback circuits (PLL/DLL) and implements it independently through a pattern generator followed by a parallel-to-serial converter. By taking out the phase modulation function from the feedback loop and implementing it as a separate digital preprocessing stage, the system achieves higher precision phase control without requiring complex feedback mechanisms. The phase variation is determined solely by the digital pattern, eliminating feedback circuit complexity while maintaining or improving precision.
Data Source
AI summary
Systems and methods are disclosed for precise generation of phase variation in digital signals. The disclosed signal generation embodiments generate a pattern of information bits that represents a digital signal with desired phase variations and transmit this digital pattern at high speed utilizing a serializer to generate a high speed bit stream. The high speed bit stream can be used to generate one or more digital signals, such as clock signals, having desired rates and desired phase variations. In certain embodiments, the desired phase variation can be introduced into the resulting digital signal by removing and/or inserting bits in a digital pattern thereby moving logic transitions (e.g., rising edge transitions, falling edge transitions) as desired within the resulting digital signal. In addition to clock signals, the resulting digital signals generated can be control signals, data signals and/or any other desired digital signal.