Pulse Position Modulation for Real-Time Jitter Signal Generation
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Solution Overview
Problem
Arbitrary waveform generators (AWGs) are unable to change jitter characteristics in real time, requiring reloading of parameters, which limits their ability to adapt to changing jitter demands in communication devices.
Innovation Solution
The method employs pulse position modulation of a first signal by a second signal to generate an output signal with predetermined jitter characteristics, allowing for real-time adjustment of jitter components such as periodic, random, and data-dependent jitter, using a signal generator comprising a first and second signal generator module and a modulation module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If software-based signal generation with parameter reloading is used, then jitter characteristics can be precisely controlled, but real-time adaptation capability is lost
Solution Approach 1:
The signal generation process is divided into independent first and second signal generator modules, where the first generates the carrier signal and the second generates the modulation signal. This segmentation allows each module to operate independently and be adjusted separately, enabling real-time changes to jitter characteristics without reloading entire parameter sets.
Solution Approach 2:
The system transitions from static parameter-based generation to dynamic modulation-based generation. By using pulse position modulation where the second signal dynamically adjusts the timing of the first signal, the jitter characteristics become dynamically controllable in real-time rather than requiring parameter reloads.
2Manufacturing precision
If parameter reloading is performed to change jitter characteristics, then precise jitter control is achieved, but time delay increases
Solution Approach 1:
The system prepares both the carrier signal and modulation signal in advance through dedicated generator modules. When jitter characteristic changes are needed, only the modulation signal parameters need adjustment rather than reloading complete parameter sets, significantly reducing the time delay while maintaining precision.
3Adaptability or versatility
If arbitrary waveform generators are used for test signal generation, then comprehensive jitter characteristics can be generated, but flexibility for rapid adaptation is limited
Solution Approach 1:
The patent replaces the traditional software-based parameter reloading mechanism with a hardware-based pulse position modulation system. This substitution enables continuous real-time adjustment of jitter characteristics through signal modulation rather than discrete parameter reloads, dramatically increasing adaptation speed while maintaining comprehensive jitter generation capability.
Data Source
AI summary
A method for generating an output signal having predetermined jitter characteristics is disclosed. A first signal is generated via a first signal generator module. A second signal is generated via a second signal generator module. The first signal is pulse position modulated by the second signal, thereby generating a modulated signal having predetermined jitter characteristics. An output signal having predetermined jitter characteristics is generated based on the modulated signal. Moreover, a signal generator for generating an output signal having predetermined jitter characteristics is disclosed.